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Co-seismic Crustal Deformation of the 12 November 2017 Mw 7.4Sar-Pol-Zahab (Iran) Earthquake: integration of analysis based on DInSAR and seismological observations
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.ORCID iD: 0000-0003-1744-7004
2018 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The November 12, 2017 Mw 7.4 earthquake that trembled near the border region between Halabjah (Iraq) andSarpol-e Zahab (Iran) is the largest ever-recorded earthquake in the Zagros Mountains since 1900. The epicenterlocation of the event suggests that the NNW trending Mountain Front Fault (MFF) has been responsible for theearthquake though it was not associated with surface faulting. Analysis of teleseismic P- and SH- body-waveformsdata indicate a well-constrained rupture propagated along the dip direction of the fault plane with an effectiverupture area of 80km long, 70km wide and focal depth of 192 km ENE dipping low-angle thrust faulting with asmall strike-slip component that produced little uplift in the region (Strike: 358o; Dip: 16o, Rake: 149o and SeismicMoment (Mo): 1.828x1020 N.m. with maximum displacement (Dmax) of 6.9m at hypocenter, and rupture velocity(Vr) of 3.2 km/s). The source rupture duration is about 45s, but the main moment release is observed in the first10s. Focal mechanism solution of the event indicates a NNW trending plane dipping 16 degrees ENE. This isin agreement with the dip direction of the MFF and the distribution of aftershocks covering an area some 50-70km wide. We explore its details in astonishment, if it is proved, that the Zagros Mountain Front fault (MFF) wasresponsible then it might have become curved at depth (?)To measure the co-seismic crustal deformation around the epicenter, we processed the ascending and descendingSentinel-1 SAR images, collected before and after the earthquake, by SNAP software and generated the interferogramsof surface deformation. The Differential InSAR (DInSAR) results show an upward and downward displacementsof 90 cm and 30 cm around the epicenter respectively. Furthermore, we investigate the differencebetween strike derived from seismological and that inferred from DInSAR satellite observations, and its possiblecauses.We do not have “best” or “right” rupture model yet, but just models satisfying for specific data sets. The aftermathof earthquakes like the 2017 Halabjah (Irak)-Sarpol-e Zahab (˙Iran) provides excellent opportunity to evaluate ourunderstanding of earthquakes and their hazards in the earthquake prone regions.

Place, publisher, year, edition, pages
Copernicus Gesellschaft GMBH , 2018. Vol. 20
Series
Geophysical Research Abstracts, ISSN 1029-7006, E-ISSN 1607-7962
Keyword [en]
InSAR, Earthquake, Iran, seismology, crustal deformation
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:hig:diva-26071OAI: oai:DiVA.org:hig-26071DiVA, id: diva2:1178058
Conference
European Geosciences Union (EGU) General Assembly 2018, 8–13 April 2018, Vienna, Austria
Note

Forthcoming

Available from: 2018-01-27 Created: 2018-01-27 Last updated: 2018-03-13Bibliographically approved

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CiteExportLink to record
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