Crustal structure of the Nepalese Himalaya revealed by receiver functions and Rayleigh wave dispersion
Abstract
We investigate the crustal and lithospheric structure in the central Nepalese Himalaya using P-to-S receiver functions and surface-wave dispersion calculated for 45 broadband and short period stations deployed as part of the Nepal Array Measuring Aftershock Seismicity Trailing Earthquake (NAMASTE) aftershock deployment. This network spatially covered the April 25, 2015 M7.8 Gorkha earthquake and May 12, 2015 M7.3 earthquake rupture areas and remained in place for ~11 months from June 2015 to May 2016. We use receiver functions and surface wave dispersion to constrain locations of key crustal and lithospheric boundaries including the Main Himalayan Thrust (MHT) and Mohorovicic discontinuity (Moho), and also to better constrain crustal P- and S-wave velocity models for central Nepal. We compare our new results with regional earthquake locations and previous geophysical studies of crustal structure in this area. Preliminary results show that receiver functions provide independent constraints on the along-strike changes in geometry of the MHT across the 2015 earthquake rupture areas that have been observed using other geophysical techniques.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.T41E0324G
- 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