Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 203, Issue 2, Pages 896-900Publisher
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggv335
Keywords
Satellite geodesy; Radar interferometry; Earthquake source observations; Seismicity and tectonics
Categories
Funding
- Japan Aerospace Exploration Agency (JAXA) [P1229002, P1390002]
- National Key Basic Research and Development Program of China [2013CB733303]
- National Natural Science Foundation of China [41222027, 41474007, 41574005]
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We map the complete surface deformation of 2015 M-w 7.8 Gorkha Nepal earthquake and its M-w 7.3 aftershock with two parallel ALOS2 descending ScanSAR paths' and two ascending Stripmap paths' images. The coseismic fault-slip model from a combined inversion of InSAR and GPS data reveals that this event is a reverse fault motion, with a slight right-lateral strike-slip component. The maximum thrust-slip and right-lateral strike-slip values are 5.7 and 1.2 m, respectively, located at a depth of 7-15 km, southeast to the epicentre. The total seismic moment 7.55 x 10(20) Nm, corresponding to a moment magnitude M-w 7.89, is similar to the seismological estimates. Fault slips of both the main shock and the largest aftershock are absent from the upper thrust shallower than 7 km, indicating that there is a locking lower edge of Himalayan Main Frontal Thrust and future seismic disaster is not unexpected in this area. We also find that the energy released in this earthquake is much less than the accumulated moment deficit over the past seven centuries estimated in previous studies, so the region surrounding Kathmandu is still under the threaten of seismic hazards.
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