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Title: Structural Control on Downdip Locking Extent of the Himalayan Megathrust

Abstract

Here, geologic reconstructions of the Main Himalayan Thrust in Nepal show a laterally extensive midcrustal ramp, hypothesized to form the downdip boundary of interseismic locking. Using a recent compilation of interseismic GPS velocities and a simplified model of fault coupling, we estimate the width of coupling across Nepal using a series of two-dimensional transects. We find that the downdip width of fault coupling increases smoothly from 70 to 90 km in eastern Nepal to 100–110 km in central Nepal, then narrows again in western Nepal. The inferred coupling transition is closely aligned with geologic reconstructions of the base of the midcrustal ramp in central and eastern Nepal, but in western Nepal, the data suggest that the location is intermediate between two proposed ramp locations. The result for western Nepal implies either an anomalous coupling transition that occurs along a shallowly dipping portion of the fault or that both ramps may be partially coupled and that a proposed crustal-scale duplexing process may be active during the interseismic period. We also find that the models require a convergence rate of 15.5 ± 2 mm/year throughout Nepal, reducing the geodetic moment accumulation rate by up to 30% compared with earlier models, partially resolving an inferred discrepancy between geodeticmore » and paleoseismic estimates of moment release across the Himalaya.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [1]
  1. Nanyang Technological Univ. (Singapore)
  2. Nanyang Technological Univ. (Singapore); Geosciences Azur, Valbonne (France)
  3. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1479411
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; interseismic deformation; fault geometry; Nepal; Main Himalayan Thrust; fault structure; duplex

Citation Formats

Lindsey, Eric O., Almeida, Rafael, Mallick, Rishav, Hubbard, Judith, Bradley, Kyle, Tsang, Louisa L. H., Liu, Yixiang, Burgmann, Roland, and Hill, Emma M. Structural Control on Downdip Locking Extent of the Himalayan Megathrust. United States: N. p., 2018. Web. doi:10.1029/2018JB015868.
Lindsey, Eric O., Almeida, Rafael, Mallick, Rishav, Hubbard, Judith, Bradley, Kyle, Tsang, Louisa L. H., Liu, Yixiang, Burgmann, Roland, & Hill, Emma M. Structural Control on Downdip Locking Extent of the Himalayan Megathrust. United States. https://doi.org/10.1029/2018JB015868
Lindsey, Eric O., Almeida, Rafael, Mallick, Rishav, Hubbard, Judith, Bradley, Kyle, Tsang, Louisa L. H., Liu, Yixiang, Burgmann, Roland, and Hill, Emma M. Mon . "Structural Control on Downdip Locking Extent of the Himalayan Megathrust". United States. https://doi.org/10.1029/2018JB015868. https://www.osti.gov/servlets/purl/1479411.
@article{osti_1479411,
title = {Structural Control on Downdip Locking Extent of the Himalayan Megathrust},
author = {Lindsey, Eric O. and Almeida, Rafael and Mallick, Rishav and Hubbard, Judith and Bradley, Kyle and Tsang, Louisa L. H. and Liu, Yixiang and Burgmann, Roland and Hill, Emma M.},
abstractNote = {Here, geologic reconstructions of the Main Himalayan Thrust in Nepal show a laterally extensive midcrustal ramp, hypothesized to form the downdip boundary of interseismic locking. Using a recent compilation of interseismic GPS velocities and a simplified model of fault coupling, we estimate the width of coupling across Nepal using a series of two-dimensional transects. We find that the downdip width of fault coupling increases smoothly from 70 to 90 km in eastern Nepal to 100–110 km in central Nepal, then narrows again in western Nepal. The inferred coupling transition is closely aligned with geologic reconstructions of the base of the midcrustal ramp in central and eastern Nepal, but in western Nepal, the data suggest that the location is intermediate between two proposed ramp locations. The result for western Nepal implies either an anomalous coupling transition that occurs along a shallowly dipping portion of the fault or that both ramps may be partially coupled and that a proposed crustal-scale duplexing process may be active during the interseismic period. We also find that the models require a convergence rate of 15.5 ± 2 mm/year throughout Nepal, reducing the geodetic moment accumulation rate by up to 30% compared with earlier models, partially resolving an inferred discrepancy between geodetic and paleoseismic estimates of moment release across the Himalaya.},
doi = {10.1029/2018JB015868},
journal = {Journal of Geophysical Research. Solid Earth},
number = 6,
volume = 123,
place = {United States},
year = {Mon Jun 04 00:00:00 EDT 2018},
month = {Mon Jun 04 00:00:00 EDT 2018}
}

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