Geodetic model of the 2015 April 25 M-w 7.8 Gorkha Nepal earthquake and M-w 7.3 aftershock estimated from InSAR and GPS data

G. Feng, Z. Li, X. Shan, Lei Zhang, G. Zhang, J. Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)896-900
Number of pages5
JournalGeophysical Journal International
Volume203
Issue number2
DOIs
Publication statusPublished - 2015

Keywords

  • Satellite geodesy
  • Radar interferometry
  • Earthquake source observations
  • Seismicity and tectonics

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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