Investigating lithospheric structure across the Nepalese Himalayas using local earthquakes.
Abstract
The Himalayan earthquakes hazard is demonstrated by the recent, large, and devastating earthquakes in Nepal (April 25, 2015, M=7.8, Gorkha earthquake and May 12, 2015,M=7.3) which damaged many buildings and killed more than 8000 people. These recent earthquakes and their aftershocks provide a unique opportunity to learn more about this intra-continental collision zone and its earthquake hazards. We deployed a regional network of 46 broadband and short period seismic instruments, called the Nepal Array Measuring Aftershock Seismicity Trailing Earthquake (NAMASTE) across eastern and central Nepal spanning the aftershock region. The array recorded aftershocks across the rupture areas from June 2015 to May 2016. Using P- and S-wave arrival time picks from several thousand aftershocks, we invert for P and S-wave velocity models of the lithosphere beneath the Nepalese Himalayas using a regional-scale double difference tomography We examine complex structural changes along the India-Eurasian plate boundary and discuss implications for future earthquake hazards in this region.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.T41E0320P
- Keywords:
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- 1242 Seismic cycle related deformations;
- GEODESY AND GRAVITY;
- 7230 Seismicity and tectonics;
- SEISMOLOGY;
- 8004 Dynamics and mechanics of faulting;
- STRUCTURAL GEOLOGY;
- 8123 Dynamics: seismotectonics;
- TECTONOPHYSICS