| Title | Patterns and mechanisms of coseismic and postseismic slips of the 2011 Mw 7.1 Van (Turkey) earthquake revealed by multi-platform synthetic aperture radar interferometry |
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| Author | Feng, W ; Li, Z;
Hoey, T; Zhang, Y; Wang, R; Samsonov, S; Li, Y; Xu, Z |
| Source | Tectonophysics vol. 632, 2014 p. 188-198, https://doi.org/10.1016/j.tecto.2014.06.011  Open Access |
| Image |  |
| Year | 2014 |
| Alt Series | Earth Sciences Sector, Contribution Series 20150196 |
| Publisher | Elsevier BV |
| Document | serial |
| Lang. | English |
| Media | paper; digital; on-line |
| File format | pdf |
| Area | Van; Turkey |
| Lat/Long WENS | 43.3417 43.4250 38.5444 38.4667 |
| Subjects | tectonics; 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 |
| Illustrations | location maps; tables; images; plots |
| Released | 2014 09 01 |
| Abstract | On 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. |
| GEOSCAN ID | 296896 |
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