Crustal deformation associated with an M8.1 earthquake in the Solomon Islands, detected by ALOS/PALSAR

Details Crustal deformation associated with an M8.1 earthquake in the Solomon Islands, detected by ALOS/PALSAR Crustal deformation associated with an M8.1 earthquake in the Solomon Islands, detected by ALOS/PALSAR

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009e%26psl.287..385m&link_type=abstract

Earth and Planetary Science Letters, Volume 287, Issue 3-4, p. 385-391.

Computer Science

1

Scientific paper

On April 1, 2007 (UTC), a large Mw 8.1 interplate earthquake struck the Solomon Islands subduction zone where complicated tectonics result from the subduction of four plates. Extensive ground movements and a large tsunami occurred in the epicentral area causing severe damage over a wide area. Using ALOS/PALSAR data and the DInSAR technique, we detected crustal deformation exceeding 2 m in islands close to the epicenter. A slip distribution of the inferred seismic fault was estimated using geodetic information derived from DInSAR processing and field investigations. The result indicates large slip areas around the hypocenter and the centroid. It is possible that the largest slip area is related to subduction of the plate boundary between the Woodlark and Australian plates. A small slip area between those large slip areas may indicate weak coupling due to thermal activity related to volcanic activity on Simbo Island. The 2007 earthquake struck an area where large earthquake has not occurred since 1970. Most of this seismic gap was filled by the 2007 events, however a small seismic gap still remains in the southeastern region of the 2007 earthquake.

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