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Fault parameters of the October 2008 Damxung Mw6.3 earthquake from InSAR inversion and its tectonic implication

Feng, W., Xu, L., and Li, Z. (2010) Fault parameters of the October 2008 Damxung Mw6.3 earthquake from InSAR inversion and its tectonic implication. Diqiu-Wuli-Xuebao Shuangyuekan: Chinese Journal of Geophysics , 53 (5). pp. 1134-1142. ISSN 0001-5733 (doi:10.3969/j.issn.0001-5733.2010.05.014 )

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Abstract

A Mw6.3 earthquake occurred in Damxung, Tibet, on October 6th, 2008. We determined the fault parameters using a descending coseismic interferogram from ENVISAT ASAR images. In addition, we examined the uncertainties in the InSAR-derived source parameters using the variance-covariance matrix of InSAR data points estimated with a 1-D semivariogram function. The inverted results showed that the earthquake occurred on a secondary fault in the eastern margin of the Yangyi basin, with a strike of 178°, a dip of 58° and dipping to west, which was normal faulting with a little of right-lateral strike slipping. It also appeared that the impact of the measurement errors on the uncertainties in InSAR derived source parameters was limited. This earthquake led to a subsidence of at least 30 cm at the epicenter, implying the Yangyi basin in the northern Yadong-Gulu Rift Belt was subsiding probably.

Item Type:Article
Keywords:Damxung Earthquake;InSAR inversion; Uncertainty;Yadong-Gulu rift belt; geodetic inversion; InSAR
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Dr Zhenhong
Authors: Feng, W., Xu, L., and Li, Z.
Subjects:Q Science > QE Geology
G Geography. Anthropology. Recreation > GB Physical geography
T Technology > TA Engineering (General). Civil engineering (General)
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Diqiu-Wuli-Xuebao Shuangyuekan: Chinese Journal of Geophysics
Publisher:Kexue Chubanshe
ISSN:0001-5733
Published Online:2010
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
513031GAS: Generic Atmosphere Solutions for radar measurementsZhenhong LiNatural Environment Research Council (NERC)NE/H001085/1School of Geographical and Earth Sciences