Complex co- and postseismic faulting of the 2017–2018 seismic sequence in western Iran revealed by InSAR and seismic data

Fathian, Aram; Atzori, Simone; Nazari, Hamid; Reicherter, Klaus; Salvi, Stefano; Svigkas, Nikos; Tatar, M.; Tolomei, Cristiano; Yaminifard, F.

doi:10.1016/j.rse.2020.112224

Cited by 22 publications

(43 citation statements)

References 72 publications

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“…This reemphasizes the limitation of surface displacements in constraining geometry and resolving the focal plane rupture ambiguity when the rupture is buried and does not break the surface, even with improved SNR (Biggs et al, 2006;Elliott et al, 2010). Additionally, our approach achieves similar fault parameters and uncertainties as that from Fathian et al, (2021) for the already visible Mw 6.3 earthquake, whilst also providing significant improvements for the Mw 6.0 earthquake (Table S1).…”

Section: Accepted Articlementioning

confidence: 82%

“…We first downsample the data, reducing the number of pixels to ~500, with a greater pixel density in the nearfield (Figure S7). Then we use the GBIS software (Bagnardi & Hooper, 2018) to provide a uniform fault plane slip solution with uncertainties to ascertain the improvement gain in constraining fault parameters from our reconstructed deformation fields, and compared to independent seismological observations and a recent InSAR solution (Fathian et al, 2021). A common issue when modelling small or buried earthquakes that do not rupture up to the surface, is that a focal plane ambiguity remains in InSAR solutions (as it does in seismologically determined solutions).…”

Section: Earthquake Modellingmentioning

confidence: 99%

“…We process five years of Sentinel‐1 observations over this area, from November 2014 to September 2019 to ensure enough data is available to constrain potential secular and annual deformation (Figure 1), and reconstruct the enhanced coseismic deformation field using a parameterized function describing surface displacement to time series data. We use independent seismological observations and a recent geodetic solution (Fathian et al., 2021) to validate our approach. We find that our deformation fields better constrain the source models and are more consistent with seismological data compared to those using single interferograms.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Resolving Power of InSAR for Earthquakes Using Time Series: A Case Study in Iran

Liu

Elliott

Craig

et al. 2021

Geophysical Research Letters

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 Using time series analysis, we can detect small coseismic displacements that are not readily visible or ambiguous in single interferograms  Earthquakes occurring close in time and space can be separated by a time-dependent parameterized model fitted to InSAR time series analysis  We can achieve more robust and seismologically consistent earthquake modelling results by using a time series approach Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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Section: Accepted Articlementioning

confidence: 82%

Section: Earthquake Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving the Resolving Power of InSAR for Earthquakes Using Time Series: A Case Study in Iran

Liu

Elliott

Craig

et al. 2021

Geophysical Research Letters

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“…In this study, among the ∼5100 events ( M n ≥ 2) reported by IRSC, we relocated ∼700 events ( M n ≥ 3) with Pg azimuthal gap less than 120 • in most cases. We used the 1-D layered velocity model presented by Fathian et al ( 2020 ). Due to the absence of close stations to the sequence (Fig.…”

Section: Seismic Sequencementioning

confidence: 99%

“…The coseismic slip distribution of the Ezgeleh earthquake has been investigated b y se veral dedicated studies (K oba yashi et al . 2018 ;Bar nhar t et al 2018 ;Chen et al 2018 ;Ding et al 2018 ;Feng et al 2018 ;Kuang et al 2018 ;Vajedian et al 2018 ;Yang et al 2018Yang et al , 2019Huang et al 2019 ;Liu & Xu 2019 ;Nissen et al 2019 ;Fathian et al 2020 ;Wang & B ürgmann 2020 ), based on different data and methods, providing reliable results for source parameters (Table 1 ). We extend those pre vious studies b y anal ysing the Ezgeleh aftershocks sequence.…”

Section: Introductionmentioning

confidence: 99%

Insight into the 2017–2019 Lurestan arc seismic sequence (Zagros, Iran); complex earthquake interaction in the basement and sediments

Jamalreyhani

Rezapour

Cesca

et al. 2022

Geophysical Journal International

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Summary Despite its high seismogenic potential, the details of the seismogenic processes of Zagros Simply Folded Belt (SFB) remains debated. Three large earthquakes (Mw 7.3, 5.9, and 6.3) struck in the Lurestan arc of the Zagros SFB in 2017 and 2018. The sequence was recorded by seismic stations at regional, and teleseismic distances. Coseismic surface displacements, measured by Sentinel-1A/B satellites, provide additional data and a unique opportunity to study these earthquakes in detail. Here, we complement previous studies of the coseismic slip distribution of the 12 November 2017 Mw 7.3 Ezgeleh earthquake by a detailed analysis of its aftershocks, and we analyzed the rupture process of the two interrelated earthquakes (25 August 2018 Mw 5.9 Tazehabad and the 25 November 2018 Mw 6.3 Sarpol-e Zahab earthquakes). We model the surface displacements obtained from Interferometric Synthetic Aperture Radar (InSAR) measurements and seismic records. We conduct non-linear probabilistic optimizations based on joint InSAR and seismic data to obtain finite-fault rupture of these earthquakes. The Lurestan arc earthquakes were followed by a sustained aftershock activity, with 133 aftershocks exceeding Mn 4.0 until December 30, 2019. We rely on the permanent seismic networks of Iran and Iraq to relocate ∼700 Mn 3 + events and estimate moment tensor solutions for 85 aftershocks down to Mw 4.0. The 2017 Ezgeleh earthquake has been considered to activate a low-angle (∼17°) dextral-thrust fault at the depth of 10–20 km. However, most of its aftershocks have shallow centroid depths (8–12 km). The joint interpretation of finite source models, moment tensor, and hypocentral location indicate that the 2018 Tazehabad and Sarpol-e Zahab earthquakes ruptured different strike-slip structures, providing evidence for the activation of the sinistral and dextral strike-slip faults, respectively. The deformation in the Lurestan arc is seismically accommodated by a complex fault system involving both thrust and strike-slip faults. Knowledge about the deformation characteristics is important for the understanding of crustal shortening, faulting, and hazard and risk assessment in this region.

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Transient Aseismic Slip Following 2017 Mw 7.3 Sarpol-e Zahab, Iran, Earthquake: Possible Evidence for Fault Frictional Heterogeneity and Thin-skinned Shortening Following a Thick-skinned Basement-involved Faulting in the Zagros Fold-thrust Belt

Guo

Motagh

et al. 2021

Preprint

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Complex co- and postseismic faulting of the 2017–2018 seismic sequence in western Iran revealed by InSAR and seismic data

Cited by 22 publications

References 72 publications

Improving the Resolving Power of InSAR for Earthquakes Using Time Series: A Case Study in Iran

Improving the Resolving Power of InSAR for Earthquakes Using Time Series: A Case Study in Iran

Insight into the 2017–2019 Lurestan arc seismic sequence (Zagros, Iran); complex earthquake interaction in the basement and sediments

Transient Aseismic Slip Following 2017 Mw 7.3 Sarpol-e Zahab, Iran, Earthquake: Possible Evidence for Fault Frictional Heterogeneity and Thin-skinned Shortening Following a Thick-skinned Basement-involved Faulting in the Zagros Fold-thrust Belt

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