Search

Your search keyword '"Jund, Helene"' showing total 7 results
Start Over Author "Jund, Helene"
7 results on '"Jund, Helene"'

1. Arrival angles of teleseismic fundamental mode Rayleigh waves across the AlpArray

Author

Kolinsky, Petr, Bokelmann, Götz, Hetenyi, Gyorgy, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-Theresia, Aubert, Coralie, Besancon, Simon, Bes De Berc, Maxime, Bokelmann, Goetz, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Clinton, John, Cougoulat, Glenn, Grawford, Wayne C., Cristiano, Luigia, Czifra, Tibor, D'Alema, Ezio, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Dessa, Jean-Xavier, Doubre, Cecile, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Friederich, Wolfgang, Fuchs, Florian, Funke, Sigward, Giardini, Domenico, Govoni, Aladino, Graczer, Zoltan, Groeschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Herak, Marijan, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jia, Yan, Jund, Helene, Kissling, Edi, Klingen, Stefan, Klotz, Bernhard, Kopp, Heidrun, Korn, Michael, Kotek, Josef, Kuhne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jürgen, Lovati, Sara, Malengros, Deny, Margheriti, Lucia, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Meier, Thomas, Metral, Laurent, Molinari, Irene, Moretti, Milena, Nardi, Anna, Pahor, Jurij, Paul, Anne, Pequegnat, Catherine, Petersen, Daniel, Pesaresi, Damiano, Piccinini, Davide, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Ritter, Joachim, Rumpker, Georg, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schippkus, Sven, Schulte-Kortnack, Detlef, Sipka, Vesna, Solarino, Stefano, Spallarossa, Daniele, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Sule, Balint, Szanyi, Gyongyver, Szucs, Eszter, Thomas, Christine, Thorwart, Martin, Tilmann, Frederik, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Wassermann, Joachim, Weber, Zoltan, Weidle, Christian, Wesztergom, Viktor, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix, Wolyniec, David, Zieke, Thomas, Zivcic, Mladen, Zlebcikova, Helena, Institut für Meteorologie und Geophysik [Wien] (IMGW), Universität Wien, Austrian Science Fund (FWF)through project P 26391–AlpArray Austria and P 30707–AlpArrayAustria 2. The Python Toolbox ObsPy by Beyreuther et al. (2010)was used for data pre-processing. Maps were plotted using GenericMapping Tools by Wessel et al. (2013)., and University of Vienna [Vienna]

Subjects
Beamforming, Wave propagation, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Earth structure, engineering.material, 010502 geochemistry & geophysics, 01 natural sciences, symbols.namesake, Geochemistry and Petrology, Time-series analysis, Wave scattering and diffraction, Rayleigh wave, 0105 earth and related environmental sciences, Anomaly (natural sciences), Geodesy, Europe, Geophysics, Phase correlation, symbols, engineering, Structure of the Earth, Surface waves and free oscillations, Geology, Earthquake location, Gaussian beam
Abstract

International audience; The dense AlpArray network allows studying seismic wave propagation with high spatial resolution. Here we introduce an array approach to measure arrival angles of teleseismic Rayleigh waves. The approach combines the advantages of phase correlation as in the two-station method with array beamforming to obtain the phase-velocity vector. 20 earthquakes from the first two years of the AlpArray project are selected, and spatial patterns of arrival-angle deviations across the AlpArray are shown in maps, depending on period and earthquake location. The cause of these intriguing spatial patterns is discussed. A simple wave-propagation modelling example using an isolated anomaly and a Gaussian beam solution suggests that much of the complexity can be explained as a result of wave interference after passing a structural anomaly along the wave paths. This indicates that arrival-angle information constitutes useful additional information on the Earth structure, beyond what is currently used in inversions.

Published
2019
Full Text
View/download PDF

2. The AlpArray seismic network

Author

Hetenyi, Gyorgy, Molinari, Irene, Clinton, John, Bokelmann, Gotz, Bondar, Istvan, Crawford, Wayne C., Dessa, Jean-Xavier, Doubre, Cecile, Friederich, Wolfgang, Fuchs, Florian, Giardini, Domenico, Graczer, Zoltan, Handy, Mark R., Herak, Marijan, Jia, Yan, Kissling, Edi, Kopp, Heidrun, Korn, Michael, Margheriti, Lucia, Meier, Thomas, Mucciarelli, Marco, Paul, Anne, Pesaresi, Damiano, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Ritter, Joachim, Rumpker, Georg, Sipka, Vesna, Spallarossa, Daniele, Thomas, Christine, Tilmann, Frederik (Prof.), Wassermann, Joachim, Weber, Michael (Prof. Dr.), Weber, Zoltan, Wesztergom, Viktor, Zivcic, Mladen, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-Theresia, Aubert, Coralie, Besancon, Simon, de Berc, Maxime Bes, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Cougoulat, Glenn, Cristiano, Luigia, Czifra, Tibor, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Funke, Sigward, Govoni, Aladino, Groschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jund, Helene, Klingen, Stefan, Klotz, Bernhard, Kolinsky, Petr, Kotek, Josef, Kuhne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jurgen, Lovati, Sara, Malengros, Deny, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Metral, Laurent, Moretti, Milena, Munzarova, Helena, Nardi, Anna, Pahor, Jurij, Pequegnat, Catherine, Petersen, Florian, Piccinini, Davide, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schippkus, Sven, Schulte-Kortnack, Detlef, Solarino, Stefano, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Sule, Balint, Szanyi, Gyongyver, Szucs, Eszter, Thorwart, Martin, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Weidle, Christian, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix, Wolyniec, David, and Zieke, Thomas

Subjects
ddc:550, Institut für Geowissenschaften
Abstract

The AlpArray programme is a multinational, European consortium to advance our understanding of orogenesis and its relationship to mantle dynamics, plate reorganizations, surface processes and seismic hazard in the Alps-Apennines-Carpathians-Dinarides orogenic system. The AlpArray Seismic Network has been deployed with contributions from 36 institutions from 11 countries to map physical properties of the lithosphere and asthenosphere in 3D and thus to obtain new, high-resolution geophysical images of structures from the surface down to the base of the mantle transition zone. With over 600 broadband stations operated for 2 years, this seismic experiment is one of the largest simultaneously operated seismological networks in the academic domain, employing hexagonal coverage with station spacing at less than 52 km. This dense and regularly spaced experiment is made possible by the coordinated coeval deployment of temporary stations from numerous national pools, including ocean-bottom seismometers, which were funded by different national agencies. They combine with permanent networks, which also required the cooperation of many different operators. Together these stations ultimately fill coverage gaps. Following a short overview of previous large-scale seismological experiments in the Alpine region, we here present the goals, construction, deployment, characteristics and data management of the AlpArray Seismic Network, which will provide data that is expected to be unprecedented in quality to image the complex Alpine mountains at depth.

Published
2018

3. Ambient-noise tomography of the wider Vienna Basin region

Author

Schippkus, Sven, Zigone, Dimitri, Bokelmann, Götz, Hetenyi, György, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-Theresia, Aubert, Coralie, Besancon, Simon, Bes de Berc, Maxime, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Clinton, John, Cougoulat, Glenn, Crawford, Wayne C., Cristiano, Luigia, Czifra, Tibor, D'Alema, Ezio, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Dessa, Jean-Xavier, Doubre, Cecile, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Friederich, Wolfgang, Fuchs, Florian, Funke, Sigward, Giardini, Domenico, Govoni, Aladino, Graczer, Zoltan, Gröschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jia, Yan, Jund, Helene, Kissling, Edi, Klingen, Stefan, Klotz, Bernhard, Kolinsky, Petr, Kopp, Heidrun, Korn, Michael, Kotek, Josef, Kühne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jürgen, Lovati, Sara, Malengros, Deny, Margheriti, Lucia, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Meier, Thomas, Metral, Laurent, Molinari, Irene, Moretti, Milena, Munzarova, Helena, Nardi, Anna, Pahor, Jurij, Paul, Anne, Pequegnat, Catherine, Petersen, Daniel, Pesaresi, Damiano, Piccinini, Davide, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Ritter, Joachim, Rümpker, Georg, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schulte-Kortnack, Detlef, Sipka, Vesna, Solarino, Stefano, Spallarossa, Daniele, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Süle, Balint, Szanyi, Gyöngyver, Szücs, Eszter, Thomas, Christine, Thorwart, Martin, Tilmann, Frederik, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Wassermann, Joachim, Weber, Zoltan, Weidle, Christian, Wesztergom, Viktor, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix Noah, Wolyniec, David, Zieke, Thomas, Zivcic, Mladen, Institut für Meteorologie und Geophysik [Wien] (IMGW), Universität Wien, Sismologie (IPGS) (IPGS-Sismologie), Institut de physique du globe de Strasbourg (IPGS), and Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010504 meteorology & atmospheric sciences, Seismic noise, Wave propagation, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Seismic interferometry, Fault (geology), Crustal structure, 010502 geochemistry & geophysics, 01 natural sciences, Physics::Geophysics, symbols.namesake, Geochemistry and Petrology, Rayleigh wave, Dispersion (water waves), Crustal imaging, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, Seismic tomography, Tectonics, Geophysics, symbols, Seismology, Geology
Abstract

International audience; We present a new 3-D shear-velocity model for the top 30 km of the crust in the wider Vienna Basin region based on surface waves extracted from ambient-noise cross-correlations. We use continuous seismic records of 63 broad-band stations of the AlpArray project to retrieve interstation Green's functions from ambient-noise cross-correlations in the period range from 5 to 25 s. From these Green's functions, we measure Rayleigh group traveltimes, utilizing all four components of the cross-correlation tensor, which are associated with Rayleigh waves (ZZ, RR, RZ and ZR), to exploit multiple measurements per station pair. A set of selection criteria is applied to ensure that we use high-quality recordings of fundamental Rayleigh modes. We regionalize the interstation group velocities in a 5 km × 5 km grid with an average path density of ∼20 paths per cell. From the resulting group-velocity maps, we extract local 1-D dispersion curves for each cell and invert all cells independently to retrieve the crustal shear-velocity structure of the study area. The resulting model provides a previously unachieved lateral resolution of seismic velocities in the region of ∼15 km. As major features, we image the Vienna Basin and Little Hungarian Plain as low-velocity anomalies, and the Bohemian Massif with high velocities. The edges of these features are marked with prominent velocity contrasts correlated with faults, such as the Alpine Front and Vienna Basin transfer fault system. The observed structures correlate well with surface geology, gravitational anomalies and the few known crystalline basement depths from boreholes. For depths larger than those reached by boreholes, the new model allows new insight into the complex structure of the Vienna Basin and surrounding areas, including deep low-velocity zones, which we image with previously unachieved detail. This model may be used in the future to interpret the deeper structures and tectonic evolution of the wider Vienna Basin region, evaluate natural resources, model wave propagation and improve earthquake locations, among others.

Published
2018
Full Text
View/download PDF

4. The AlpArray Seismic Network: A Large-Scale European Experiment to Image the Alpine Orogen

Author

Hetenyi, Gyorgy, Molinari, Irene, Clinton, John, Bokelmann, Gotz, Bondar, Istvan, Crawford, Wayne C., Dessa, Jean-xavier, Doubre, Cecile, Friederich, Wolfgang, Fuchs, Florian, Giardini, Domenico, Graczer, Zoltan, Handy, Mark R., Herak, Marijan, Jia, Yan, Kissling, Edi, Kopp, Heidrun, Korn, Michael, Margheriti, Lucia, Meier, Thomas, Mucciarelli, Marco, Paul, Anne, Pesaresi, Damiano, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Ritter, Joachim, Rumpker, Georg, Sipka, Vesna, Spallarossa, Daniele, Thomas, Christine, Tilmann, Frederik, Wassermann, Joachim, Weber, Michael, Weber, Zoltan, Wesztergom, Viktor, Zivcic, Mladen, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-theresia, Aubert, Coralie, Besancon, Simon, De Berc, Maxime Bes, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Cougoulat, Glenn, Cristiano, Luigia, Czifra, Tibor, D'Alema, Ezio, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Funke, Sigward, Govoni, Aladino, Groschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jund, Helene, Klingen, Stefan, Klotz, Bernhard, Kolinsky, Petr, Kotek, Josef, Kuhne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jurgen, Lovati, Sara, Malengros, Deny, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Metral, Laurent, Moretti, Milena, Munzarova, Helena, Nardi, Anna, Pahor, Jurij, Pequegnat, Catherine, Petersen, Florian, Piccinini, Davide, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schippkus, Sven, Schulte-kortnack, Detlef, Solarino, Stefano, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Sule, Balint, Szanyi, Gyongyver, Szucs, Eszter, Thorwart, Martin, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Weidle, Christian, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix, Wolyniec, David, Zieke, Thomas, Hetenyi, Gyorgy, Molinari, Irene, Clinton, John, Bokelmann, Gotz, Bondar, Istvan, Crawford, Wayne C., Dessa, Jean-xavier, Doubre, Cecile, Friederich, Wolfgang, Fuchs, Florian, Giardini, Domenico, Graczer, Zoltan, Handy, Mark R., Herak, Marijan, Jia, Yan, Kissling, Edi, Kopp, Heidrun, Korn, Michael, Margheriti, Lucia, Meier, Thomas, Mucciarelli, Marco, Paul, Anne, Pesaresi, Damiano, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Ritter, Joachim, Rumpker, Georg, Sipka, Vesna, Spallarossa, Daniele, Thomas, Christine, Tilmann, Frederik, Wassermann, Joachim, Weber, Michael, Weber, Zoltan, Wesztergom, Viktor, Zivcic, Mladen, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-theresia, Aubert, Coralie, Besancon, Simon, De Berc, Maxime Bes, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Cougoulat, Glenn, Cristiano, Luigia, Czifra, Tibor, D'Alema, Ezio, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Funke, Sigward, Govoni, Aladino, Groschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jund, Helene, Klingen, Stefan, Klotz, Bernhard, Kolinsky, Petr, Kotek, Josef, Kuhne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jurgen, Lovati, Sara, Malengros, Deny, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Metral, Laurent, Moretti, Milena, Munzarova, Helena, Nardi, Anna, Pahor, Jurij, Pequegnat, Catherine, Petersen, Florian, Piccinini, Davide, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schippkus, Sven, Schulte-kortnack, Detlef, Solarino, Stefano, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Sule, Balint, Szanyi, Gyongyver, Szucs, Eszter, Thorwart, Martin, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Weidle, Christian, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix, Wolyniec, David, and Zieke, Thomas

Abstract

The AlpArray programme is a multinational, European consortium to advance our understanding of orogenesis and its relationship to mantle dynamics, plate reorganizations, surface processes and seismic hazard in the Alps-Apennines-Carpathians-Dinarides orogenic system. The AlpArray Seismic Network has been deployed with contributions from 36 institutions from 11 countries to map physical properties of the lithosphere and asthenosphere in 3D and thus to obtain new, high-resolution geophysical images of structures from the surface down to the base of the mantle transition zone. With over 600 broadband stations operated for 2 years, this seismic experiment is one of the largest simultaneously operated seismological networks in the academic domain, employing hexagonal coverage with station spacing at less than 52 km. This dense and regularly spaced experiment is made possible by the coordinated coeval deployment of temporary stations from numerous national pools, including ocean-bottom seismometers, which were funded by different national agencies. They combine with permanent networks, which also required the cooperation of many different operators. Together these stations ultimately fill coverage gaps. Following a short overview of previous large-scale seismological experiments in the Alpine region, we here present the goals, construction, deployment, characteristics and data management of the AlpArray Seismic Network, which will provide data that is expected to be unprecedented in quality to image the complex Alpine mountains at depth.

Published
2018
Full Text
View/download PDF

5. Ground deformation monitoring of the eruption offshore Mayotte

Author

Peltier, Aline, Saur, Sébastien, Ballu, Valérie, Beauducel, François, Briole, Pierre, Chanard, Kristel, Dausse, Denis, De Chabalier, Jean-Bernard, Grandin, Raphael, Rouffiac, Perrine, Tranchant, Yann-Treden, de Berc, Maxime Bès, Besançon, Simon, Boissier, Patrice, Broucke, Céleste, Brunet, Christophe, Canjamalé, Kevin, Carme, Erwan, Catherine, Philippe, Colombain, Alison, Crawford, Wayne, Daniel, Romuald, Dectot, Grégoire, Desfete, Nicolas, Doubre, Cécile, Dumouch, Tom, Griot, Cyprien, Grunberg, Marc, Jund, Hélène, Kowalski, Philippe, Lauret, Frédéric, Lebreton, Jacques, Pesqueira, Frédérick, Tronel, Frédéric, Valty, Pierre, and van der Woerd, Jérôme

Subjects
GNSS, Pressure gauge, Volcano deformation, Mayotte, GRACE modeling, Joint inversion, Fani Maoré, Geophysics. Cosmic physics, QC801-809, Chemistry, QD1-999, Geology, QE1-996.5
Abstract

In May 2018, the Mayotte island, located in the Indian Ocean, was affected by an unprecedented seismic crisis, followed by anomalous on-land surface displacements in July 2018. Cumulatively from July 1, 2018 to December 31, 2021, the horizontal displacements were approximately 21 to 25 cm eastward, and subsidence was approximately 10 to 19 cm. The study of data recorded by the on-land GNSS network, and their modeling coupled with data from ocean bottom pressure gauges, allowed us to propose a magmatic origin of the seismic crisis with the deflation of a deep source east of Mayotte, that was confirmed in May 2019 by the discovery of a submarine eruption, 50 km offshore of Mayotte ([Feuillet et al., 2021]). Despite a non-optimal network geometry and receivers located far from the source, the GNSS data allowed following the deep dynamics of magma transfer, via the volume flow monitoring, throughout the eruption.

Published
2022
Full Text
View/download PDF

6. Seismotectonics in Northeastern France and neighboring regions

Author

Doubre, Cécile, Meghraoui, Mustapha, Masson, Frédéric, Lambotte, Sophie, Jund, Hélène, Bès de Berc, Maxime, and Grunberg, Marc

Subjects
Low strain region, Seismicity, Active fault, Northeastern France, Intraplate domain, Geophysics. Cosmic physics, QC801-809, Chemistry, QD1-999, Geology, QE1-996.5
Abstract

The region of northeastern France is affected by low-magnitude background seismicity, with the rare occurrence of moderate earthquakes, which gives this region a non-negligible seismic risk. We provide an overview of the seismicity and seismotectonics of this intraplate domain and of its sub-regions: the Upper-Rhine Graben (URG), the external range and foreland of Jura, the Vosges, northern France and southern Belgium. Previously published catalogues over historical and instrumental times are used, and the epicentral distribution of earthquakes is compared to known tectonic structures, and the recently computed deformation field. Although no large earthquakes with $\mathrm{M}_{\mathrm{w}} > 6.0$ occurred since the 1356 Basel seismic event (Io IX, MKS), the recent identification of active faults suggests periods of high seismic strain rates in the past. The origin of the seismic activity in each of these sub-regions, characterized by low to very-low strain rates, is attributed to pre-existing faults reactivated under specific natural or anthropogenic conditions.

Published
2021
Full Text
View/download PDF

7. Induced and triggered seismicity below the city of Strasbourg, France from November 2019 to January 2021

Author

Schmittbuhl, Jean, Lambotte, Sophie, Lengliné, Olivier, Grunberg, Marc, Jund, Hélène, Vergne, Jérôme, Cornet, François, Doubre, Cécile, and Masson, Frédéric

Subjects
Fault zone, Induced seismicity, Deep geothermal energy, Rhine Graben, Fluid pressure, EGS, Geophysics. Cosmic physics, QC801-809, Chemistry, QD1-999, Geology, QE1-996.5
Abstract

Between November 2019 and January 2021, a series of seismic events were felt by the population of the city of Strasbourg, France. The first main event (MLv 3.0) that occurred on November 12, 2019, was part of a seismic swarm (the southern cluster) that has been initiated a few days before, lasted four months, and was located by the BCSF-Rénass (EOST), below La Robertsau area at a depth of 5 km. Its location in the vicinity of the deep geothermal wells (Geoven), the temporal correlation with the injection activity on site, the similarity of the depth between the bottom of the wells and the hypocenter of the event, the lack of local seismicity before the event occurrence, the known geological structures including crustal faults in the area, all strongly support the possible triggering of the events by the deep geothermal activities despite the relatively large distance (4–5 km). From template matching and double-difference relocations, a complex fault zone is evidenced in this southern cluster area that extends over 800 m. Focal mechanisms of the two largest events of the cluster are consistent with the known orientation of the main fault zone in the area. The regional stress field in combination with the fault orientation and a Coulomb failure criterion shows that the seismic cluster location is in an unstable domain, if the cohesion of the fault is weak, particularly sensitive to stress perturbations. In October 2020, after a new series of hydraulic tests, second cluster of seismic events with more felt earthquakes (the northern cluster) developed closer to the geothermal wells (${

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results