Poroelastic relaxation and aftershocks of the 2001 Bhuj earthquake, India

Gahalaut, Kalpna ; Gahalaut, V. K. ; Kayal, J. R. (2008) Poroelastic relaxation and aftershocks of the 2001 Bhuj earthquake, India Tectonophysics, 460 (1-4). pp. 76-82. ISSN 0040-1951

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Related URL: http://dx.doi.org/10.1016/j.tecto.2008.07.004


We analyse aftershocks of the 26 January 2001 Bhuj earthquake, India, that were recorded for 10 weeks following the mainshock. We calculate undrained or instantaneous pore pressure and change in Coulomb stress due to the earthquake and their poroelastic relaxation in the following 10 weeks period. Almost all aftershocks occurred in the region of coseismic dilatation. In the subsequent period, pore pressure increased through relaxation in the dilatation region which further modified coseismic Coulomb stress. Maximum increase in pore pressure is estimated to be about 0.7 MPa in 60 days time following the mainshock. Correlation between the zones of increased pore pressure and postseismic Coulomb stress with that of aftershocks, suggests a definite role of fluid diffusion in their delayed triggering.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Poroelastic Relaxation; Coulomb Stress; Pore Pressure; Aftershocks; 2001 Bhuj Earthquake
ID Code:113271
Deposited On:07 Jun 2018 09:16
Last Modified:07 Jun 2018 09:16

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