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TitlePatterns and mechanisms of coseismic and postseismic slips of the 2011 Mw 7.1 Van (Turkey) earthquake revealed by multi-platform synthetic aperture radar interferometry
AuthorFeng, WORCID logo; Li, Z; Hoey, T; Zhang, Y; Wang, R; Samsonov, SORCID logo; Li, Y; Xu, Z
SourceTectonophysics vol. 632, 2014 p. 188-198, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20150196
PublisherElsevier BV
Mediapaper; digital; on-line
File formatpdf
AreaVan; Turkey
Lat/Long WENS 43.3417 43.4250 38.5444 38.4667
Subjectstectonics; geophysics; earthquakes; earthquake studies; earthquake mechanisms; faults, slip; tectonic setting; tectonic interpretations; modelling; Bardakçi-Saray thrust fault zone; Van region; COSMO-SkyMED; Envisat; RADARSAT-2; interferometry
Illustrationslocation maps; tables; images; plots
AbstractOn 23rd October 2011, a MW 7.1 reverse slip earthquake occurred in the Bardakçi-Saray thrust fault zone in the Van region, Eastern Turkey. Earlier geodetic studies have found different slip distributions in terms of both magnitude and pattern. In this paper, we present several COSMO-SkyMED (CSK), Envisat ASAR and RADARSAT-2 interferograms spanning different time intervals, showing that significant postseismic signals can be observed in the first three days after the mainshock. Using observations that combine coseismic and postseismic signals is shown to significantly underestimate coseismic slip. We hence employed the CSK pair with the minimum postseismic signals to generate one conventional interferogram and one along-track interferogram for further coseismic modelling. Our best-fit coseismic slip model suggests that: (1) this event is associated with a buried NNW dipping fault with a preferable dip angle of 49° and a maximum slip of 6.5 m at a depth of 12 km; and (2) two unequal asperities can be observed, consistent with previous seismic solutions. Significant oblique aseismic slip with predominant left-lateral slip components above the coseismic rupture zone within the first 3 days after the mainshock is also revealed by a postseismic CSK interferogram, indicating that the greatest principal stress axis might have rotated due to a significant stress drop during the coseismic rupture.

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