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Title: Structural control on downdip locking extent of the himalayan megathrust
Authors: Lindsey, Eric O.
Almeida, Rafael
Mallick, Rishav
Hubbard, Judith
Bradley, Kyle
Tsang, Louisa L. H.
Liu, Yixiang
Burgmann, Roland
Hill, Emma M.
Keywords: Duplex
Fault Geometry
Issue Date: 2018
Source: Lindsey, E. O., Almeida, R., Mallick, R., Hubbard, J., Bradley, K., Tsang, L. L. H., . . . Hill, E. M. (2018). Structural Control on Downdip Locking Extent of the Himalayan Megathrust. Journal of Geophysical Research: Solid Earth, 123(6), 5265-5278. doi:10.1029/2018JB015868
Series/Report no.: Journal of Geophysical Research: Solid Earth
Abstract: 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.
ISSN: 2169-9356
DOI: 10.1029/2018JB015868
Rights: © 2018 The Author(s). This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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