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Remote Sens. 2016, 8(6), 532; doi:10.3390/rs8060532

Deformation and Related Slip Due to the 2011 Van Earthquake (Turkey) Sequence Imaged by SAR Data and Numerical Modeling

Istituto Nazionale di Geofisica e Vulcanologia, Rome 00143, Italy
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Academic Editors: Zhenhong Li, Magaly Koch and Prasad S. Thenkabail
Received: 5 February 2016 / Revised: 24 May 2016 / Accepted: 14 June 2016 / Published: 22 June 2016
(This article belongs to the Special Issue Earth Observations for Geohazards)
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Abstract

A Mw 7.1 earthquake struck the Eastern Anatolia, near the city of Van (Turkey), on 23 October 2011. We investigated the coseismic surface displacements using the InSAR technique, exploiting adjacent ENVISAT tracks and COSMO-SkyMed images. Multi aperture interferometry was also applied, measuring ground displacements in the azimuth direction. We solved for the fault geometry and mechanism, and we inverted the slip distribution employing a numerical forward model that includes the available regional structural data. Results show a horizontally elongated high slip area (7–9 m) at 12–17 km depth, while the upper part of the fault results unruptured, enhancing its seismogenic potential. We also investigated the post-seismic phase acquiring most of the available COSMO-SkyMed, ENVISAT and TERRASAR-X SAR images. The computed afterslip distributions show that the shallow section of the fault underwent considerable aseismic slip during the early days after the mainshock, of tens of centimeters. Our results support the hypothesis of a seismogenic potential reduction within the first 8–10 km of the fault through the energy release during the post-seismic phase. Despite non-optimal data coverage and coherence issues, we demonstrate that useful information about the Van earthquake could still be retrieved from SAR data through detailed analysis. View Full-Text
Keywords: SAR interferometry; multi aperture interferometry; Van earthquake; remote sensing; numerical modelling; inverse methods; coseismic deformation; post-seismic deformation SAR interferometry; multi aperture interferometry; Van earthquake; remote sensing; numerical modelling; inverse methods; coseismic deformation; post-seismic deformation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Trasatti, E.; Tolomei, C.; Pezzo, G.; Atzori, S.; Salvi, S. Deformation and Related Slip Due to the 2011 Van Earthquake (Turkey) Sequence Imaged by SAR Data and Numerical Modeling. Remote Sens. 2016, 8, 532.

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