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TitleGeodetic constraints of the 2017 Mw7.3 Sarpol Zahab, Iran Earthquake, and its implications on the structure and mechanics of the northwest Zagros Thrust-Fold Belt
AuthorFeng, WORCID logo; Samsonov, SORCID logo; Almeida, R; Yassaghi, A; Li, J; Qiu, Q; Li, P; Zheng, W
SourceGeophysical Research Letters vol. 45, issue 14, 2018 p. 6853-6861, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20200438
Mediapaper; on-line; digital
File formatpdf; html
AreaSarpol-e Zahab; Zagros Mountains; Bamo Mount; Iran (Islamic Republic of)
Lat/Long WENS 36.0000 62.0000 40.0000 24.0000
Subjectsstructural geology; tectonics; geophysics; Science and Technology; Nature and Environment; earthquakes; plate margins; crustal movements; deformation; displacement; geodesy; satellite geodesy; radar methods; bedrock geology; basement geology; structural features; faults; models; crustal uplift; topography; remote sensing; satellites; Eurasian Plate; Arabian Plate; Zagros Thrust-Fold Belt; 2017 Mw7.3 Sarpol Zahab Earthquake; Global positioning systems
Illustrationsgeoscientific sketch maps; focal mechanisms; tables; profiles; rose diagrams; cross-sections
Released2018 06 08
AbstractWe reveal transient surface deformation following the 2017 Mw7.3 Sarpol Zahab (Iran) earthquake using Interferometric Synthetic Aperture Radar (InSAR) measurements. Based on the coseismic interferograms derived from the Advanced Land Observing Satellite-2 (ALOS-2) data, the preferred slip model of the earthquake has a centroid depth of 14.5 ± 4 km and suggests that a basement fault is most likely responsible for the 2017 earthquake in the northwest Zagros fold-thrust belt zone. Two slip asperities with a maximum slip of 6 m separated by 16 km are observed in the best fitting slip model. The accumulated afterslip in the first month after the mainshock determined from the Sentinel-1 postseismic interferograms reveals a slip distribution that lies immediately updip of the coseismic slip, implying that frictional properties of the fault vary along the rupture patch. The Bamo Mount in the earthquake area was uplifted by approximately 1 m during the earthquake. We suggest that local topographic growth from both seismic and aseismic faulting behaviors is common within the Zagros fold-thrust belt zone based on our findings regarding the 2017 earthquake and other significant events in the region.

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