The 2015 Gorkha earthquake: A large event illuminating the Main Himalayan Thrust fault
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State: Public
Version: Final published version
License: Not specified
Serval ID
serval:BIB_5929BCF832FB
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
The 2015 Gorkha earthquake: A large event illuminating the Main Himalayan Thrust fault
Journal
Geophysical Research Letters
ISSN
1944-8007
ISSN-L
1944-8007
Publication state
Published
Issued date
2016
Peer-reviewed
Oui
Volume
43
Pages
2517-2525
Language
english
Abstract
The 2015 Gorkha earthquake sequence provides an outstanding opportunity to better characterize the geometry of the Main Himalayan Thrust (MHT). To overcome limitations due to unaccounted lateral heterogeneities, we perform Centroid Moment Tensor inversions in a 3-D Earth model for the main shock and largest aftershocks. In parallel, we recompute S-to-P and P-to-S receiver functions from the Hi-CLIMB data set. Inverted centroid locations fall within a low-velocity zone at 10–15 km depth and corresponding to the subhorizontal portion of the MHT that ruptured during the Gorkha earthquake. North of the main shock hypocenter, receiver functions indicate a north dipping feature that likely corresponds to the midcrustal ramp connecting the flat portion to the deep part of the MHT. Our analysis of the main shock indicates that long-period energy emanated updip of high-frequency radiation sources previously inferred. This frequency-dependent rupture process might be explained by different factors such as fault geometry and the presence of fluids.
Keywords
Earthquake source observations, Subduction zones, Body waves, Surface waves and free oscillations, Main Himalayan Thrust, 2015 Gorkha earthquake, receiver function, earthquake source observations, fault geometry, focal mechanism
Publisher's website
Open Access
Yes
Create date
18/05/2016 14:02
Last modification date
29/04/2025 7:05