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Afroz Ansari, Md.
- Insights into the Great Mw 7.9 Nepal Earthquake of 25 April 2015
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Authors
Affiliations
1 Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 007, IN
2 Life, Environmental and Earth Sciences Division, University of Bucharest, RO
1 Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 007, IN
2 Life, Environmental and Earth Sciences Division, University of Bucharest, RO
Source
Current Science, Vol 113, No 10 (2017), Pagination: 2014-2020Abstract
The 2015 Mw 7.9 earthquake occurred in the Nepal Himalaya between the Indian and Asian plates. The gravity modelling has been carried out along a 2D trench-orthogonal profile passing through the epicentre of this earthquake. The projections of mainshocks and aftershocks show their major confinement around the bending segment of the Indian upper crust (IUC). The operative shallowly plunging maximum compressive stress led to the accumulation of strain energy around the bending zone of the IUC, and triggered thrust-dominated southward movement of the Indian crustal block along a shallowly, dipping shear plane in the anisotropic layer. This can be broadly explained by three-stage rupture processes: the first one was associated with slow nucleation and rupture growth for early ~15 sec, the second one migrated upward, rupturing the uppermost part of the IUC for the next ~10 sec, and the third one propagated very fast during deformation for the remaining ~25 sec till the fracture- tip reached the overlying brittle Asian crust.Keywords
2015 Nepal Earthquake, Frictional Sliding, Gravity Modelling, Indian Upper Crust.Full Text
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