The 2017 Mw 7.3 Sarpol Zahāb Earthquake, Iran: A compact blind shallow-dipping thrust event in the mountain front fault basement

The 12 November 2017 Mw 7.3 Sarpol Zahāb earthquake is one of the largest events to have occurred in the north-western Zagros fold-and-thrust belt during the instrumental period. We use teleseismic and synthetic aperture radar data to study the earthquake source parameters, rupture process and activ...

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Bibliographic Details
Published inTectonophysics Vol. 747-748; pp. 108 - 114
Main Authors Chen, Kejie, Xu, Wenbin, Mai, P. Martin, Gao, Hua, Zhang, Lei, Ding, Xiaoli
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 13.11.2018
Elsevier BV
Subjects
Aperture
Asperity
Data
Distribution
Earthquakes
Fault lines
Geological faults
InSAR
Joint inversion
Mountain Front Fault
Process parameters
Radar
Radar data
Rupture
SAR (radar)
Satellite radar
Satellites
Seismic activity
Slip
Synthetic aperture radar
Tectonics
Thrust bearings
Zagros
InSAR
Mountain Front Fault
Zagros
Joint inversion
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Summary:The 12 November 2017 Mw 7.3 Sarpol Zahāb earthquake is one of the largest events to have occurred in the north-western Zagros fold-and-thrust belt during the instrumental period. We use teleseismic and synthetic aperture radar data to study the earthquake source parameters, rupture process and active tectonic characteristics of the event. We find that both data sets individually produce remarkably similar slip distribution, indicative of buried faulting that is consistent with the lack of significant surface rupture. Through the joint inversion of satellite radar and teleseismic data, we find that the rupture propagated rapidly (~3.2 km/s) and asymmetrically along strike to the south, but relatively slowly (~1.5 km/s) in the updip direction, and formed a single large-slip asperity with a peak slip value close to 5 m. Given the regional tectonic context of the distribution of known faults and lithologies, we suggest that the maximum slip is either located in the lowest sedimentary cover or the uppermost basement of the Mountain Front Fault. •Joint inversion of teleseismic and geodetic data for rupture process of the 2017 event•Rupture propagated rapidly (~3.2 km/s) and asymmetrically along strike, but slowly (~1.5 km/s) in the up dip direction•The peak slip is likely either located in the lowest sedimentary cover or the uppermost basement of the Mountain Front fault
ISSN:0040-1951
1879-3266
DOI:10.1016/j.tecto.2018.09.015