Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

Revisiting the Fault Locking of the Central Himalayan Thrust with a Viscoelastic Earthquake-Cycle Deformation Model


Diao,  Faqi
External Organizations;


Wang,  R.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Zhu,  Yage
External Organizations;

Xiong,  Xiong
External Organizations;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in GFZpublic
Supplementary Material (public)
There is no public supplementary material available

Diao, F., Wang, R., Zhu, Y., Xiong, X. (2022): Revisiting the Fault Locking of the Central Himalayan Thrust with a Viscoelastic Earthquake-Cycle Deformation Model. - Seismological Research Letters, 93, 1, 193-200.

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009659
Based on a viscoelastic earthquake‐cycle deformation model, we revisit the fault locking of the central Himalayan thrust using geodetic data acquired in the past three decades. By incorporating the viscoelastic relaxation effect induced by stress buildup and release, our viscoelastic model is capable of explaining the far‐field observation with similar fault locking width obtained in previous studies. Elastic models underestimate the far‐field deformation and consequently underestimate the fault slip rate by attributing the far‐field deformation to stable intraplate deformation. A steady‐state viscosity of ∼1019  Pa⋅s is required for the lower crust beneath south Tibet to best fit the crustal velocity. The optimal slip rate and locking width of the central Main Himalayan Thrust are estimated to 18.8 ± 1.6 mm/a and 85 ± 2.1 km, respectively. The inferred fault locking width, along with the down‐dip rupture extension of the 2015 Gorkha earthquake, agrees well with the identified mid‐crustal ramp, which leads to an interpretation that the fault geometry of the central Himalayan thrust plays an important role on fault kinematics. Our results highlight that viscoelastic relaxation during the earthquake cycle should be incorporated for robust estimation of fault locking parameters and reasonable data fitting.