期刊
SEISMOLOGICAL RESEARCH LETTERS
卷 93, 期 1, 页码 193-200出版社
SEISMOLOGICAL SOC AMER
DOI: 10.1785/0220200310
关键词
-
资金
- National Natural Science Foundation of China [41731072]
- National Key R and D Program of China [2017YFC1500501]
- International Training Course Seismology and Seismic Hazard Assessment - GFZ German Research Center for Geosciences
- German Federal Foreign Office through the German Humanitarian Assistance program [S08-60 321.50 ALL 03/19]
This study reexamines the fault locking of the central Himalayan thrust using a viscoelastic earthquake-cycle deformation model and geodetic data acquired in the past three decades. The results show that incorporating the viscoelastic relaxation effect is necessary for robust estimation of fault locking parameters and reasonable data fitting.
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 similar to 10(19) 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据