18 results on '"Woodhouse, Adam"'
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2. Depositional rate, grain size and magnetic mineral sulfidization in turbidite sequences, Hikurangi Margin, New Zealand
- Author
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Noda, Atsushi, Greve, Annika, Woodhouse, Adam, Crundwell, Martin, Noda, Atsushi, Greve, Annika, Woodhouse, Adam, and Crundwell, Martin
- Published
- 2024
3. Giant offshore pumice deposit records a shallow submarine explosive eruption of ancestral Santorini
- Author
-
Druitt, Tim, Kutterolf, Steffen, Ronge, Thomas A., Hübscher, Christian, Nomikou, Paraskevi, Preine, Jonas, Gertisser, Ralf, Karstens, Jens, Keller, Jörg, Koukousioura, Olga, Manga, Michael, Metcalfe, Abigail, McCanta, Molly, McIntosh, Iona, Pank, Katharina, Woodhouse, Adam, Beethe, Sarah, Berthod, Carole, Chiyonobu, Shun, Chen, Hehe, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Peccia, Ally, Yamamoto, Yuzuru, Bernard, Alexis, Perez, Tatiana Fernandez, Jones, Christopher, Joshi, Kumar Batuk, Kletetschka, Günther, Li, Xiaohui, Morris, Antony, Polymenakou, Paraskevi, Tominaga, Masako, Papanikolaou, Dimitrios, Wang, Kuo-Lung, Lee, Hao-Yang, Druitt, Tim, Kutterolf, Steffen, Ronge, Thomas A., Hübscher, Christian, Nomikou, Paraskevi, Preine, Jonas, Gertisser, Ralf, Karstens, Jens, Keller, Jörg, Koukousioura, Olga, Manga, Michael, Metcalfe, Abigail, McCanta, Molly, McIntosh, Iona, Pank, Katharina, Woodhouse, Adam, Beethe, Sarah, Berthod, Carole, Chiyonobu, Shun, Chen, Hehe, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Peccia, Ally, Yamamoto, Yuzuru, Bernard, Alexis, Perez, Tatiana Fernandez, Jones, Christopher, Joshi, Kumar Batuk, Kletetschka, Günther, Li, Xiaohui, Morris, Antony, Polymenakou, Paraskevi, Tominaga, Masako, Papanikolaou, Dimitrios, Wang, Kuo-Lung, and Lee, Hao-Yang
- Abstract
Large explosive volcanic eruptions from island arcs pour pyroclastic currents into marine basins, impacting ecosystems and generating tsunamis that threaten coastal communities and infrastructures. Risk assessments require robust records of such highly hazardous events, which is challenging as most of the products lie buried under the sea. Here we report the discovery by IODP Expedition 398 of a giant rhyolitic pumice deposit emplaced 520 ± 10 ky ago at water depths of 200 to 1000 m during a high-intensity, shallow submarine eruption of ancestral Santorini Volcano. Pyroclastic currents discharged into the sea transformed into turbidity currents and slurries, forming a >89 ± 8 km 3 volcaniclastic megaturbidite up to 150 m thick in the surrounding marine basins, while breaching of the sea surface by the eruption column laid down veneers of ignimbrite on three islands. The eruption is one of the largest recorded on the South Aegean Volcanic Arc, and highlights the hazards from submarine explosive eruptions.
- Published
- 2024
- Full Text
- View/download PDF
4. Hazardous explosive eruptions of a recharging multi-cyclic island arc caldera
- Author
-
Preine, Jonas, Karstens, Jens, Hübscher, Christian, Druitt, Tim, Kutterolf, Steffen, Nomikou, Paraskevi, Manga, Michael, Gertisser, Ralf, Pank, Katharina, Beethe, Sarah, Berthod, Carole, Crutchley, Gareth, McIntosh, Iona, Ronge, Thomas, Tominaga, Masako, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Mateo, Zenon, Peccia, Ally, Jones, Christopher, Kletetschka, Günther, Metcalfe, Abigail, Bernard, Alexis, Chen, Hehe, Chiyonobu, Shun, Fernandez-Perez, Tatiana, Joshi, Kumar Batuk, Koukousioura, Olga, McCanta, Molly, Morris, Antony, Polymenakou, Paraskevi, Woodhouse, Adam, Yamamoto, Yuzuru, Wang, Kuo-Lung, Lee, Hao-Yang, Li, Xiaohui, Papanikolaou, Dimitrios, Preine, Jonas, Karstens, Jens, Hübscher, Christian, Druitt, Tim, Kutterolf, Steffen, Nomikou, Paraskevi, Manga, Michael, Gertisser, Ralf, Pank, Katharina, Beethe, Sarah, Berthod, Carole, Crutchley, Gareth, McIntosh, Iona, Ronge, Thomas, Tominaga, Masako, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Mateo, Zenon, Peccia, Ally, Jones, Christopher, Kletetschka, Günther, Metcalfe, Abigail, Bernard, Alexis, Chen, Hehe, Chiyonobu, Shun, Fernandez-Perez, Tatiana, Joshi, Kumar Batuk, Koukousioura, Olga, McCanta, Molly, Morris, Antony, Polymenakou, Paraskevi, Woodhouse, Adam, Yamamoto, Yuzuru, Wang, Kuo-Lung, Lee, Hao-Yang, Li, Xiaohui, and Papanikolaou, Dimitrios
- Abstract
Caldera-forming eruptions of silicic volcanic systems are among the most devastating events on Earth. By contrast, post-collapse volcanic activity initiating new caldera cycles is generally considered less hazardous. Formed after Santorini’s latest caldera-forming eruption of ~1600 bce , the Kameni Volcano in the southern Aegean Sea enables the eruptive evolution of a recharging multi-cyclic caldera to be reconstructed. Kameni’s eruptive record has been documented by onshore products and historical descriptions of mainly effusive eruptions dating back to 197 bce . Here we combine high-resolution seismic reflection data with cored lithologies from International Ocean Discovery Program Expedition 398 at four sites to determine the submarine architecture and volcanic history of intra-caldera deposits from Kameni. Our shore-crossing analysis reveals the deposits of a submarine explosive eruption that produced up to 3.1 km 3 of pumice and ash, which we relate to a historical eruption in 726 ce . The estimated volcanic explosivity index of magnitude 5 exceeds previously considered worst-case eruptive scenarios for Santorini. Our finding that the Santorini caldera is capable of producing large explosive eruptions at an early stage in the caldera cycle implies an elevated hazard potential for the eastern Mediterranean region, and potentially for other recharging silicic calderas.
- Published
- 2024
- Full Text
- View/download PDF
5. Giant offshore pumice deposit records a shallow submarine explosive eruption of ancestral Santorini
- Author
-
Druitt, Tim, Kutterolf, Steffen, Ronge, Thomas A., Hübscher, Christian, Nomikou, Paraskevi, Preine, Jonas, Gertisser, Ralf, Karstens, Jens, Keller, Jörg, Koukousioura, Olga, Manga, Michael, Metcalfe, Abigail, McCanta, Molly, McIntosh, Iona, Pank, Katharina, Woodhouse, Adam, Beethe, Sarah, Berthod, Carole, Chiyonobu, Shun, Chen, Hehe, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Peccia, Ally, Yamamoto, Yuzuru, Bernard, Alexis, Perez, Tatiana Fernandez, Jones, Christopher, Joshi, Kumar Batuk, Kletetschka, Günther, Li, Xiaohui, Morris, Antony, Polymenakou, Paraskevi, Tominaga, Masako, Papanikolaou, Dimitrios, Wang, Kuo-Lung, Lee, Hao-Yang, Druitt, Tim, Kutterolf, Steffen, Ronge, Thomas A., Hübscher, Christian, Nomikou, Paraskevi, Preine, Jonas, Gertisser, Ralf, Karstens, Jens, Keller, Jörg, Koukousioura, Olga, Manga, Michael, Metcalfe, Abigail, McCanta, Molly, McIntosh, Iona, Pank, Katharina, Woodhouse, Adam, Beethe, Sarah, Berthod, Carole, Chiyonobu, Shun, Chen, Hehe, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Peccia, Ally, Yamamoto, Yuzuru, Bernard, Alexis, Perez, Tatiana Fernandez, Jones, Christopher, Joshi, Kumar Batuk, Kletetschka, Günther, Li, Xiaohui, Morris, Antony, Polymenakou, Paraskevi, Tominaga, Masako, Papanikolaou, Dimitrios, Wang, Kuo-Lung, and Lee, Hao-Yang
- Abstract
Large explosive volcanic eruptions from island arcs pour pyroclastic currents into marine basins, impacting ecosystems and generating tsunamis that threaten coastal communities and infrastructures. Risk assessments require robust records of such highly hazardous events, which is challenging as most of the products lie buried under the sea. Here we report the discovery by IODP Expedition 398 of a giant rhyolitic pumice deposit emplaced 520 ± 10 ky ago at water depths of 200 to 1000 m during a high-intensity, shallow submarine eruption of ancestral Santorini Volcano. Pyroclastic currents discharged into the sea transformed into turbidity currents and slurries, forming a >89 ± 8 km 3 volcaniclastic megaturbidite up to 150 m thick in the surrounding marine basins, while breaching of the sea surface by the eruption column laid down veneers of ignimbrite on three islands. The eruption is one of the largest recorded on the South Aegean Volcanic Arc, and highlights the hazards from submarine explosive eruptions.
- Published
- 2024
- Full Text
- View/download PDF
6. Hazardous explosive eruptions of a recharging multi-cyclic island arc caldera
- Author
-
Preine, Jonas, Karstens, Jens, Hübscher, Christian, Druitt, Tim, Kutterolf, Steffen, Nomikou, Paraskevi, Manga, Michael, Gertisser, Ralf, Pank, Katharina, Beethe, Sarah, Berthod, Carole, Crutchley, Gareth, McIntosh, Iona, Ronge, Thomas, Tominaga, Masako, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Mateo, Zenon, Peccia, Ally, Jones, Christopher, Kletetschka, Günther, Metcalfe, Abigail, Bernard, Alexis, Chen, Hehe, Chiyonobu, Shun, Fernandez-Perez, Tatiana, Joshi, Kumar Batuk, Koukousioura, Olga, McCanta, Molly, Morris, Antony, Polymenakou, Paraskevi, Woodhouse, Adam, Yamamoto, Yuzuru, Wang, Kuo-Lung, Lee, Hao-Yang, Li, Xiaohui, Papanikolaou, Dimitrios, Preine, Jonas, Karstens, Jens, Hübscher, Christian, Druitt, Tim, Kutterolf, Steffen, Nomikou, Paraskevi, Manga, Michael, Gertisser, Ralf, Pank, Katharina, Beethe, Sarah, Berthod, Carole, Crutchley, Gareth, McIntosh, Iona, Ronge, Thomas, Tominaga, Masako, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Mateo, Zenon, Peccia, Ally, Jones, Christopher, Kletetschka, Günther, Metcalfe, Abigail, Bernard, Alexis, Chen, Hehe, Chiyonobu, Shun, Fernandez-Perez, Tatiana, Joshi, Kumar Batuk, Koukousioura, Olga, McCanta, Molly, Morris, Antony, Polymenakou, Paraskevi, Woodhouse, Adam, Yamamoto, Yuzuru, Wang, Kuo-Lung, Lee, Hao-Yang, Li, Xiaohui, and Papanikolaou, Dimitrios
- Abstract
Caldera-forming eruptions of silicic volcanic systems are among the most devastating events on Earth. By contrast, post-collapse volcanic activity initiating new caldera cycles is generally considered less hazardous. Formed after Santorini’s latest caldera-forming eruption of ~1600 bce , the Kameni Volcano in the southern Aegean Sea enables the eruptive evolution of a recharging multi-cyclic caldera to be reconstructed. Kameni’s eruptive record has been documented by onshore products and historical descriptions of mainly effusive eruptions dating back to 197 bce . Here we combine high-resolution seismic reflection data with cored lithologies from International Ocean Discovery Program Expedition 398 at four sites to determine the submarine architecture and volcanic history of intra-caldera deposits from Kameni. Our shore-crossing analysis reveals the deposits of a submarine explosive eruption that produced up to 3.1 km 3 of pumice and ash, which we relate to a historical eruption in 726 ce . The estimated volcanic explosivity index of magnitude 5 exceeds previously considered worst-case eruptive scenarios for Santorini. Our finding that the Santorini caldera is capable of producing large explosive eruptions at an early stage in the caldera cycle implies an elevated hazard potential for the eastern Mediterranean region, and potentially for other recharging silicic calderas.
- Published
- 2024
- Full Text
- View/download PDF
7. Hazardous explosive eruptions of a recharging multi-cyclic island arc caldera
- Author
-
Preine, Jonas, Karstens, Jens, Hübscher, Christian, Druitt, Tim, Kutterolf, Steffen, Nomikou, Paraskevi, Manga, Michael, Gertisser, Ralf, Pank, Katharina, Beethe, Sarah, Berthod, Carole, Crutchley, Gareth, McIntosh, Iona, Ronge, Thomas, Tominaga, Masako, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Mateo, Zenon, Peccia, Ally, Jones, Christopher, Kletetschka, Günther, Metcalfe, Abigail, Bernard, Alexis, Chen, Hehe, Chiyonobu, Shun, Fernandez-Perez, Tatiana, Joshi, Kumar Batuk, Koukousioura, Olga, McCanta, Molly, Morris, Antony, Polymenakou, Paraskevi, Woodhouse, Adam, Yamamoto, Yuzuru, Wang, Kuo-Lung, Lee, Hao-Yang, Li, Xiaohui, Papanikolaou, Dimitrios, Preine, Jonas, Karstens, Jens, Hübscher, Christian, Druitt, Tim, Kutterolf, Steffen, Nomikou, Paraskevi, Manga, Michael, Gertisser, Ralf, Pank, Katharina, Beethe, Sarah, Berthod, Carole, Crutchley, Gareth, McIntosh, Iona, Ronge, Thomas, Tominaga, Masako, Clark, Acacia, DeBari, Susan, Johnston, Raymond, Mateo, Zenon, Peccia, Ally, Jones, Christopher, Kletetschka, Günther, Metcalfe, Abigail, Bernard, Alexis, Chen, Hehe, Chiyonobu, Shun, Fernandez-Perez, Tatiana, Joshi, Kumar Batuk, Koukousioura, Olga, McCanta, Molly, Morris, Antony, Polymenakou, Paraskevi, Woodhouse, Adam, Yamamoto, Yuzuru, Wang, Kuo-Lung, Lee, Hao-Yang, Li, Xiaohui, and Papanikolaou, Dimitrios
- Abstract
Caldera-forming eruptions of silicic volcanic systems are among the most devastating events on Earth. By contrast, post-collapse volcanic activity initiating new caldera cycles is generally considered less hazardous. Formed after Santorini’s latest caldera-forming eruption of ~1600 bce , the Kameni Volcano in the southern Aegean Sea enables the eruptive evolution of a recharging multi-cyclic caldera to be reconstructed. Kameni’s eruptive record has been documented by onshore products and historical descriptions of mainly effusive eruptions dating back to 197 bce . Here we combine high-resolution seismic reflection data with cored lithologies from International Ocean Discovery Program Expedition 398 at four sites to determine the submarine architecture and volcanic history of intra-caldera deposits from Kameni. Our shore-crossing analysis reveals the deposits of a submarine explosive eruption that produced up to 3.1 km 3 of pumice and ash, which we relate to a historical eruption in 726 ce . The estimated volcanic explosivity index of magnitude 5 exceeds previously considered worst-case eruptive scenarios for Santorini. Our finding that the Santorini caldera is capable of producing large explosive eruptions at an early stage in the caldera cycle implies an elevated hazard potential for the eastern Mediterranean region, and potentially for other recharging silicic calderas.
- Published
- 2024
- Full Text
- View/download PDF
8. Trench floor depositional response to glacio-eustatic changes over the last 45 ka, northern Hikurangi subduction margin, New Zealand
- Author
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Woodhouse, Adam, Barnes, Philip M., Shorrock, Anthony, Strachan, Lorna J., Crundwell, Martin, Bostock, Helen C., Hopkins, Jenni, Kutterolf, Steffen, Pank, Katharina, Behrens, Erik, Greve, Annika, Bell, Rebecca, Cook, Ann, Petronotis, Katerina, LeVay, Leah, Jamieson, Robert A., Aze, Tracy, Wallace, Laura, Saffer, Demian, Pecher, Ingo, Woodhouse, Adam, Barnes, Philip M., Shorrock, Anthony, Strachan, Lorna J., Crundwell, Martin, Bostock, Helen C., Hopkins, Jenni, Kutterolf, Steffen, Pank, Katharina, Behrens, Erik, Greve, Annika, Bell, Rebecca, Cook, Ann, Petronotis, Katerina, LeVay, Leah, Jamieson, Robert A., Aze, Tracy, Wallace, Laura, Saffer, Demian, and Pecher, Ingo
- Published
- 2022
- Full Text
- View/download PDF
9. Slow slip source characterized by lithological and geometric heterogeneity
- Author
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Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H. N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Huepers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H. N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Huepers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., and Wang, Xiujuan
- Abstract
Slow slip events (SSEs) accommodate a significant proportion of tectonic plate motion at subduction zones, yet little is known about the faults that actually host them. The shallow depth (<2 km) of well-documented SSEs at the Hikurangi subduction zone offshore New Zealand offers a unique opportunity to link geophysical imaging of the subduction zone with direct access to incoming material that represents the megathrust fault rocks hosting slow slip. Two recent International Ocean Discovery Program Expeditions sampled this incoming material before it is entrained immediately down-dip along the shallow plate interface. Drilling results, tied to regional seismic reflection images, reveal heterogeneous lithologies with highly variable physical properties entering the SSE source region. These observations suggest that SSEs and associated slow earthquake phenomena are promoted by lithological, mechanical, and frictional heterogeneity within the fault zone, enhanced by geometric complexity associated with subduction of rough crust.
- Published
- 2020
10. Slow slip source characterized by lithological and geometric heterogeneity
- Author
-
non-UU output of UU-AW members, Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H. N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Huepers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, non-UU output of UU-AW members, Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H. N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Huepers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., and Wang, Xiujuan
- Published
- 2020
11. Slow slip source characterized by lithological and geometric heterogeneity
- Author
-
non-UU output of UU-AW members, Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H. N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Huepers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, non-UU output of UU-AW members, Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H. N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Huepers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., and Wang, Xiujuan
- Published
- 2020
12. Slow slip source characterized by lithological and geometric heterogeneity
- Author
-
Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H.N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Hüpers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, Wu, Hung-Yu, Pecher, Ingo A., LeVay, Leah J., Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H.N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Hüpers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, Wu, Hung-Yu, Pecher, Ingo A., and LeVay, Leah J.
- Abstract
Slow slip events (SSEs) accommodate a significant proportion of tectonic plate motion at subduction zones, yet little is known about the faults that actually host them. The shallow depth (<2 km) of well-documented SSEs at the Hikurangi subduction zone offshore New Zealand offers a unique opportunity to link geophysical imaging of the subduction zone with direct access to incoming material that represents the megathrust fault rocks hosting slow slip. Two recent International Ocean Discovery Program Expeditions sampled this incoming material before it is entrained immediately down-dip along the shallow plate interface. Drilling results, tied to regional seismic reflection images, reveal heterogeneous lithologies with highly variable physical properties entering the SSE source region. These observations suggest that SSEs and associated slow earthquake phenomena are promoted by lithological, mechanical, and frictional heterogeneity within the fault zone, enhanced by geometric complexity associated with subduction of rough crust.
- Published
- 2020
- Full Text
- View/download PDF
13. Slow slip source characterized by lithological and geometric heterogeneity
- Author
-
non-UU output of UU-AW members, Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H. N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Huepers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, non-UU output of UU-AW members, Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H. N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Huepers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., and Wang, Xiujuan
- Published
- 2020
14. Slow slip source characterized by lithological and geometric heterogeneity
- Author
-
Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H.N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Hüpers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, Wu, Hung-Yu, Pecher, Ingo A., LeVay, Leah J., Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H.N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Hüpers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, Wu, Hung-Yu, Pecher, Ingo A., and LeVay, Leah J.
- Abstract
Slow slip events (SSEs) accommodate a significant proportion of tectonic plate motion at subduction zones, yet little is known about the faults that actually host them. The shallow depth (<2 km) of well-documented SSEs at the Hikurangi subduction zone offshore New Zealand offers a unique opportunity to link geophysical imaging of the subduction zone with direct access to incoming material that represents the megathrust fault rocks hosting slow slip. Two recent International Ocean Discovery Program Expeditions sampled this incoming material before it is entrained immediately down-dip along the shallow plate interface. Drilling results, tied to regional seismic reflection images, reveal heterogeneous lithologies with highly variable physical properties entering the SSE source region. These observations suggest that SSEs and associated slow earthquake phenomena are promoted by lithological, mechanical, and frictional heterogeneity within the fault zone, enhanced by geometric complexity associated with subduction of rough crust.
- Published
- 2020
- Full Text
- View/download PDF
15. Slow slip source characterized by lithological and geometric heterogeneity
- Author
-
Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H.N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Hüpers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, Wu, Hung-Yu, Pecher, Ingo A., LeVay, Leah J., Barnes, Philip M., Wallace, Laura M., Saffer, Demian M., Bell, Rebecca E., Underwood, Michael B., Fagereng, Ake, Meneghini, Francesca, Savage, Heather M., Rabinowitz, Hannah S., Morgan, Julia K., Kitajima, Hiroko, Kutterolf, Steffen, Hashimoto, Yoshitaka, Engelmann de Oliveira, Christie H., Noda, Atsushi, Crundwell, Martin P., Shepherd, Claire L., Woodhouse, Adam D., Harris, Robert N., Wang, Maomao, Henrys, Stuart, Barker, Daniel H.N., Petronotis, Katerina E., Bourlange, Sylvain M., Clennell, Michael B., Cook, Ann E., Dugan, Brandon E., Elger, Judith, Fulton, Patrick M., Gamboa, Davide, Greve, Annika, Han, Shuoshuo, Hüpers, Andre, Ikari, Matt J., Ito, Yoshihiro, Kim, Gil Young, Koge, Hiroaki, Lee, Hikweon, Li, Xuesen, Luo, Min, Malie, Pierre R., Moore, Gregory F., Mountjoy, Joshu J., McNamara, David D., Paganoni, Matteo, Screaton, Elizabeth J., Shankar, Uma, Shreedharan, Srisharan, Solomon, Evan A., Wang, Xiujuan, Wu, Hung-Yu, Pecher, Ingo A., and LeVay, Leah J.
- Abstract
Slow slip events (SSEs) accommodate a significant proportion of tectonic plate motion at subduction zones, yet little is known about the faults that actually host them. The shallow depth (<2 km) of well-documented SSEs at the Hikurangi subduction zone offshore New Zealand offers a unique opportunity to link geophysical imaging of the subduction zone with direct access to incoming material that represents the megathrust fault rocks hosting slow slip. Two recent International Ocean Discovery Program Expeditions sampled this incoming material before it is entrained immediately down-dip along the shallow plate interface. Drilling results, tied to regional seismic reflection images, reveal heterogeneous lithologies with highly variable physical properties entering the SSE source region. These observations suggest that SSEs and associated slow earthquake phenomena are promoted by lithological, mechanical, and frictional heterogeneity within the fault zone, enhanced by geometric complexity associated with subduction of rough crust.
- Published
- 2020
- Full Text
- View/download PDF
16. Factors affecting consistency and accuracy in identifying modern macroperforate planktonic foraminifera
- Author
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Fenton, Isabel S., Baranowski, Ulrike, Boscolo-Galazzo, Flavia, Cheales, Hannah, Fox, Lyndsey, King, David J., Larkin, Christina, Latas, Marcin, Liebrand, Diederik, Miller, C. Giles, Nilsson-Kerr, Katrina, Piga, Emanuela, Pugh, Hazel, Remmelzwaal, Serginio, Roseby, Zoe A., Smith, Yvonne M., Stukins, Stephen, Taylor, Ben, Woodhouse, Adam, Worne, Savannah, Pearson, Paul N., Poole, Christopher R., Wade, Bridget S., Purvis, Andy, Fenton, Isabel S., Baranowski, Ulrike, Boscolo-Galazzo, Flavia, Cheales, Hannah, Fox, Lyndsey, King, David J., Larkin, Christina, Latas, Marcin, Liebrand, Diederik, Miller, C. Giles, Nilsson-Kerr, Katrina, Piga, Emanuela, Pugh, Hazel, Remmelzwaal, Serginio, Roseby, Zoe A., Smith, Yvonne M., Stukins, Stephen, Taylor, Ben, Woodhouse, Adam, Worne, Savannah, Pearson, Paul N., Poole, Christopher R., Wade, Bridget S., and Purvis, Andy
- Abstract
Planktonic foraminifera are widely used in biostratigraphic, palaeoceanographic and evolutionary studies, but the strength of many study conclusions could be weakened if taxonomic identifications are not reproducible by different workers. In this study, to assess the relative importance of a range of possible reasons for among-worker disagreement in identification, 100 specimens of 26 species of macroperforate planktonic foraminifera were selected from a core-top site in the subtropical Pacific Ocean. Twenty-three scientists at different career stages – including some with only a few days experience of planktonic foraminifera – were asked to identify each specimen to species level, and to indicate their confidence in each identification. The participants were provided with a species list and had access to additional reference materials. We use generalised linear mixed-effects models to test the relevance of three sets of factors in identification accuracy: participant-level characteristics (including experience), species-level characteristics (including a participant’s knowledge of the species) and specimen-level characteristics (size, confidence in identification). The 19 less experienced scientists achieve a median accuracy of 57 %, which rises to 75 % for specimens they are confident in. For the 4 most experienced participants, overall accuracy is 79 %, rising to 93 % when they are confident. To obtain maximum comparability and ease of analysis, everyone used a standard microscope with only 35× magnification, and each specimen was studied in isolation. Consequently, these data provide a lower limit for an estimate of consistency. Importantly, participants could largely predict whether their identifications were correct or incorrect: their own assessments of specimen-level confidence and of their previous knowledge of species concepts were the strongest predictors of accuracy.
17. Paleoecology and evolutionary response of planktonic foraminifera to the mid-Pliocene Warm Period and Plio-Pleistocene bipolar ice sheet expansion
- Author
-
Woodhouse, Adam, Procter, Frances A., Jackson, Sophie L., Jamieson, Robert A., Newton, Robert J., Sexton, Philip F., Aze, Tracy, Woodhouse, Adam, Procter, Frances A., Jackson, Sophie L., Jamieson, Robert A., Newton, Robert J., Sexton, Philip F., and Aze, Tracy
- Abstract
The Pliocene-Recent is associated with many important climatic and paleoceanographic changes, which have shaped the biotic and abiotic nature of the modern world. The closure of the Central American Seaway and the development and intensification of Northern Hemisphere ice sheets had profound global impacts on the latitudinal and vertical structure of the oceans, triggering the extinction and radiation of many marine groups. In particular, marine calcifying planktonic foraminifera, which are highly sensitive to water column structure, exhibited a series of extinctions as global temperatures fell. By analyzing high-resolution (∼ 5 kyr) sedimentary records from the Eastern Equatorial Pacific Ocean, complemented with global records from the novel Triton dataset, we document the biotic changes in this microfossil group, within which three species displayed isochronous co-extinction, and species with cold-water affinity increased in dominance as meridional temperature gradients steepened. We suggest that these changes were associated with the terminal stages of the closure of the Central American Seaway, where following the sustained warmth of the mid-Pliocene Warm Period, bipolar ice sheet expansion initiated a world in which cold- and deep-dwelling species became increasingly more successful. Such global-scale paleoecological and macroevolutionary variations between the Pliocene and the modern icehouse climate would suggest significant deviations from pre-industrial baselines within modern and future marine plankton communities as anthropogenic climate forcing continues.
18. Factors affecting consistency and accuracy in identifying modern macroperforate planktonic foraminifera
- Author
-
Fenton, Isabel S., Baranowski, Ulrike, Boscolo-Galazzo, Flavia, Cheales, Hannah, Fox, Lyndsey, King, David J., Larkin, Christina, Latas, Marcin, Liebrand, Diederik, Miller, C. Giles, Nilsson-Kerr, Katrina, Piga, Emanuela, Pugh, Hazel, Remmelzwaal, Serginio, Roseby, Zoe A., Smith, Yvonne M., Stukins, Stephen, Taylor, Ben, Woodhouse, Adam, Worne, Savannah, Pearson, Paul N., Poole, Christopher R., Wade, Bridget S., Purvis, Andy, Fenton, Isabel S., Baranowski, Ulrike, Boscolo-Galazzo, Flavia, Cheales, Hannah, Fox, Lyndsey, King, David J., Larkin, Christina, Latas, Marcin, Liebrand, Diederik, Miller, C. Giles, Nilsson-Kerr, Katrina, Piga, Emanuela, Pugh, Hazel, Remmelzwaal, Serginio, Roseby, Zoe A., Smith, Yvonne M., Stukins, Stephen, Taylor, Ben, Woodhouse, Adam, Worne, Savannah, Pearson, Paul N., Poole, Christopher R., Wade, Bridget S., and Purvis, Andy
- Abstract
Planktonic foraminifera are widely used in biostratigraphic, palaeoceanographic and evolutionary studies, but the strength of many study conclusions could be weakened if taxonomic identifications are not reproducible by different workers. In this study, to assess the relative importance of a range of possible reasons for among-worker disagreement in identification, 100 specimens of 26 species of macroperforate planktonic foraminifera were selected from a core-top site in the subtropical Pacific Ocean. Twenty-three scientists at different career stages – including some with only a few days experience of planktonic foraminifera – were asked to identify each specimen to species level, and to indicate their confidence in each identification. The participants were provided with a species list and had access to additional reference materials. We use generalised linear mixed-effects models to test the relevance of three sets of factors in identification accuracy: participant-level characteristics (including experience), species-level characteristics (including a participant’s knowledge of the species) and specimen-level characteristics (size, confidence in identification). The 19 less experienced scientists achieve a median accuracy of 57 %, which rises to 75 % for specimens they are confident in. For the 4 most experienced participants, overall accuracy is 79 %, rising to 93 % when they are confident. To obtain maximum comparability and ease of analysis, everyone used a standard microscope with only 35× magnification, and each specimen was studied in isolation. Consequently, these data provide a lower limit for an estimate of consistency. Importantly, participants could largely predict whether their identifications were correct or incorrect: their own assessments of specimen-level confidence and of their previous knowledge of species concepts were the strongest predictors of accuracy.
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