Tectonic implications and seismicity triggering during the 2008 Baluchistan, Pakistan earthquake sequence

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	Tectonic implications and seismicity triggering during the 2008 Baluchistan, Pakistan earthquake sequence
	Yadav, R. B. S. ; Gahalaut, V. K. ; Chopra, Sumer ; Shan, Bin
刊名	Journal of Asian Earth Sciences
	2012
卷号	45 期号:0 页码:167-178
中文摘要	A damaging and widely felt moderate earthquake (Mw 6.4) hit the rural, mountainous region of southwestern Pakistan on October 28, 2008. The main shock was followed by another earthquake of identical magnitude (Mw 6.4) on the next day. The spatial distribution of aftershocks and focal mechanism revealed a NW-SE striking rupture with right-lateral strike-slip motion which is sympathetic to the NNW-SSE striking active mapped Urghargai Fault. The occurrence of strike-slip earthquakes suggests that along with the thrust faults, strike slip faults too are present beneath the fold-and-thrust belt of Sulaiman-Kirthar ranges and accommodates some of the relative motion of the Indian and Eurasian plates. To assess the characteristics of this sequence, the statistical parameters like aftershocks temporal decay, b-value of G-R relationship, partitioning of radiated seismic energy due to aftershocks, and spatial fractal dimension (D-value) have been examined. The b-value is estimated as 1.03 +/- 0.42 and suggests the tectonic genesis of the sequence and crustal heterogeneity within rock mass. The low p-value of 0.89 +/- 0.07 implies slow decay of aftershocks activity which is probably an evidence for low surface heat flow. A value of spatial fractal dimension of 2.08 +/- 0.02 indicates random spatial distribution and that the source is a two-dimensional plane filled-up by fractures. The static coseismic Coulomb stress changes due to the foreshock (Mw 5.3) were found to increase stress by more than 0.04 bars at the hypocenter of the main shock, thus promoting the failure. The cumulative coseismic Coulomb stress changes due to the foreshock and mainshocks suggest that most of the aftershocks occurred in the region of increased Coulomb stress, and to the SE to the mainshock rupture. (C) 2011 Elsevier Ltd. All rights reserved.
原文出处	://WOS:000300203300015
公开日期	2012-04-11
内容类型	期刊论文
源URL	[http://ir.whigg.ac.cn//handle/342008/3418]
专题	测量与地球物理研究所_其他_期刊论文
推荐引用方式 GB/T 7714	Yadav, R. B. S.,Gahalaut, V. K.,Chopra, Sumer,et al. Tectonic implications and seismicity triggering during the 2008 Baluchistan, Pakistan earthquake sequence[J]. Journal of Asian Earth Sciences,2012,45(0):167-178.
APA	Yadav, R. B. S.,Gahalaut, V. K.,Chopra, Sumer,&Shan, Bin.(2012).Tectonic implications and seismicity triggering during the 2008 Baluchistan, Pakistan earthquake sequence.Journal of Asian Earth Sciences,45(0),167-178.
MLA	Yadav, R. B. S.,et al."Tectonic implications and seismicity triggering during the 2008 Baluchistan, Pakistan earthquake sequence".Journal of Asian Earth Sciences 45.0(2012):167-178.