Publication Date:
2022-05-06
Description:
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.
Description:
Published
Description:
id 532
Description:
5T. Sismologia, geofisica e geologia per l'ingegneria sismica
Description:
JCR Journal
Keywords:
remote sensing
;
numerical modelling
;
finite fault
;
slip inversion
;
van earthquake
;
04.06. Seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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