Rupture history of the 2010 Ms 7.1 Yushu earthquake by joint inversion of teleseismic data and InSAR measurements

Autor: Chunyan Qu, Xinjian Shan, Guohong Zhang, Zhenhong Li, Guifang Zhang, Bertrand Delouis, Julien Balestra, Yunhua Liu
Přispěvatelé: Géoazur (GEOAZUR 6526), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), State Key Laboratory of Earthquake Dynamics, Institute of Geology, School of Geographical and Earth Sciences [Univ Glasgow], University of Glasgow, Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2013
Předmět:
Zdroj: Tectonophysics
Tectonophysics, Elsevier, 2013, 584, pp.129-137. ⟨10.1016/j.tecto.2012.03.024⟩
Tectonophysics, 2013, 584, pp.129-137. ⟨10.1016/j.tecto.2012.03.024⟩
ISSN: 0040-1951
1879-3266
Popis: International audience; We applied a joint inversion of teleseismic data and InSAR measurements, aiming at obtaining a robust rupture process and slip distribution of the 2010 Yushu earthquake, through reducing the trade-off between slip timing and location. With the condition of the final static deformation of InSAR measurements, the rupture history can be achieved with more confidence. Surface offset constraint is also applied to our inversion. Through synthetic data inversion we find that InSAR data can resolve better fault slip at near surface depth range of 0-15 km than teleseismic data; yet it has much poorer resolution at near hypocenter area, where teleseismic data has a relatively better resolution. Our final joint inversion results show that the 2010 Yushu earthquake has an essential rupture time around 20 s, during which 90% of the seismic moment has been released. Two peak energy releasing moments occur at 8 and 12 s after the earthquake initiation, respectively. The fault slip breaks the surface at most segments of the total 76 km fault model and the maximum slip reaches 2.2 m. We also find two peak-slip asperities, one at near hypocentral area, mainly distributed at depth around 10-15 km; the other distributed in a large area at the eastern segments at near surface. Our most robust estimation of the seismic moment reaches 2.30 × 1019 N.m, equivalent to a moment magnitude of Mw 6.9.
Databáze: OpenAIRE
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