1. The energetic 2010 MW 7.1 Solomon Islands tsunami earthquake.
- Author
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Newman, Andrew V., Feng, Lujia, Fritz, Hermann M., Lifton, Zachery M., Kalligeris, Nikos, and Wei, Yong
- Subjects
TSUNAMIS ,LANDSLIDES ,SEISMOLOGY ,OCEAN waves ,SUBDUCTION zones ,EARTHQUAKES - Abstract
SUMMARY On 2010 January 3 a moment magnitude M
W 7.1 earthquake struck the Solomon Islands very near the San Cristobal trench, causing extensive landslides and surprisingly large tsunami waves. Because of the unique proximity of islands to the trench (<20 km) and earthquake, a post-seismic survey successfully identified unexpected widespread coseismic subsidence towards the trench (up to 80 cm), with no discernable post-seismic deformation. Approximately 1000 km from the earthquake ocean-bottom pressure sensors measured 1-2 cm open-ocean tsunami waves. Though spatially limited, the local tsunami wave heights up to 7 m were comparable to the much larger adjacent 2007 MW 8.1 earthquake. The seismically determined focal mechanism, broad-scale subsidence, tsunami amplitude and open ocean wave heights are all explained by an extremely shallow low-angle thrust adjacent to the impinging subduction of the two seamounts near the trench. This event belongs to a potentially new class of shallow 'tsunami earthquakes' that is not identified as deficient in radiated seismic energy. [ABSTRACT FROM AUTHOR]- Published
- 2011
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