First results from a combined marine and land passive seismic network near Simeulue island
Abstract
Beginning in October 2005, we have installed a temporary network of 43 ocean bottom and 8 land stations on the forearc of the Sumatran subduction zone on and around the island of Simeulue, with recording times of 3-5 months. The marine work was carried out during Sonne cruise SO186. The temporary network is a component of the SEACAUSE project. Typically 7-8 locatable events are registered per day but this rate increases dramatically after several events with magnitudes larger than 5.5 within the array. All events were relocated by first using a joint inversion for a 1-D velocity model and station statics, and then redetermining locations and location uncertainties by a non-linear location method (oct-tree). Events occur on or near the plate interface, within the downgoing slab and in the overriding plate. The largest concentration of events is found just south of Simeulue island and its extension along strike, near the presumed updip limit of the co-seismic rupture.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2006
- Bibcode:
- 2006AGUFM.U53A0025T
- Keywords:
-
- 7230 Seismicity and tectonics (1207;
- 1217;
- 1240;
- 1242);
- 7240 Subduction zones (1207;
- 1219;
- 1240)