The 18 August 2014 Mw 6.2 Mormori, Iran, Earthquake: A Thin-Skinned Faulting in the Zagros Mountain Inferred from InSAR Measurements

Motagh, Mahdi; Bahroudi, Abbas; Haghighi, Mahmud Haghshenas; Samsonov, Sergey; Fielding, E. J.; Wetzel, Hans‐Ulrich

doi:10.1785/0220140222

Cited by 33 publications

(28 citation statements)

References 41 publications

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“…This initial estimate for the fault geometry (strike of 298 • and dip of 28 • ) is within 6 • of strike and 1 • of dip of that of Motagh et al (2015), and is consistent with the NE-dipping plane in the seismological solutions. We then invert for the distribution of slip on this plane that provides the closest match to the InSAR results.…”

Section: Single or Multiple Faults?supporting

confidence: 78%

“…Interferograms for the time period covering the earthquakes were produced by Motagh et al (2015) using data from the Radarsat-2 satellite. Two interferograms were made, covering the eastern and western parts of the epicentral area, with a small overlap.…”

Section: N S a R R E S U Lt Smentioning

confidence: 99%

“…To remove long-wavelength orbital errors in the interferograms, each was flattened by removing a quadratic polynomial for the entire scene, after the atmospheric correction had been made to the data. This process is equivalent to the procedure used by Motagh et al (2015), who removed a bilinear ramp and an elevation-dependent term from the interferograms, and demonstrated the robust presence of earthquake-related displacements following this procedure.…”

Section: N S a R R E S U Lt Smentioning

confidence: 99%

“…Following Motagh et al (2015), we initially find the single uniform-slip fault plane that best fits the surface displacements. This initial estimate for the fault geometry (strike of 298 • and dip of 28 • ) is within 6 • of strike and 1 • of dip of that of Motagh et al (2015), and is consistent with the NE-dipping plane in the seismological solutions.…”

Section: Single or Multiple Faults?mentioning

confidence: 99%

“…The mainshock has been previously studied using InSAR by Motagh et al (2015), and in this paper we build upon their work by incorporating additional techniques and datasets to analyse the earthquake sequence. We initially describe results from modelling P and SH seismic waveforms to obtain the focal parameters of the larger events.…”

Section: Introductionmentioning

confidence: 99%

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Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence

Copley¹,

Karasözen

Oveisi

et al. 2015

Geophys. J. Int.

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S U M M A R YWe present source models for the August 2014 Murmuri (Dehloran) earthquake sequence in the Zagros Mountains of Iran. An M w 6.2 mainshock was followed by an aftershock sequence containing five events of M w ≥ 5.4. Models of P and SH waveforms show that all events had dominantly thrust-faulting mechanisms, and had centroid depths that place them within the thick sedimentary sequence, above the crystalline basement. The combination of our estimated focal mechanisms, relative relocations of the event hypocentres and the surface displacement patterns observed using InSAR imply that the mainshock and largest aftershock ruptured different fault planes and both contributed to the surface deformation. The fault planes both slipped in horizontally elongated patches, possibly due to rheological layering limiting the updip and downdip extent of rupture. The slip vector of the Murmuri mainshock implies that the decollement beneath the Lorestan Arc is weaker than any such feature beneath the Dezful Embayment, providing an explanation for the plan-view sinuosity of the range-front of the Zagros Mountains.

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Section: Single or Multiple Faults?supporting

confidence: 78%

Section: N S a R R E S U Lt Smentioning

confidence: 99%

Section: N S a R R E S U Lt Smentioning

confidence: 99%

Section: Single or Multiple Faults?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence

Copley¹,

Karasözen

Oveisi

et al. 2015

Geophys. J. Int.

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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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Estimating the maximum earthquake magnitude in the Iranian Plateau

et al. 2021

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The Iranian Plateau has been subjected to destructive earthquakes throughout its history. Reliable assessment of the seismic hazard in this earthquake-prone region is therefore essential. Our study focuses on estimating the maximum earthquake magnitude as one of the main parameters of seismic hazard analysis. We implemented two quantitative approaches, namely probabilistic and deterministic. The probabilistic method allows combining the historical (i.e., incomplete) and the instrumental parts of a catalog with different levels of completeness and considers the uncertainties in earthquake magnitude determination. In this study, we used a unified, declustered, and complete catalog of earthquakes in Iran, covering the period from the 4th century B.C. to 2019. We calculated the maximum possible magnitudes for hundreds of grid points by using the seismicity data in a 200-km radial region around each grid point. The maximum possible earthquake was observed to vary between 6.0 and 8.2 and the highest values were found in the Alborz-Azarbayejan seismotectonic province, Kopeh-Dagh, central east Iran, Makran, and the southeast Zagros. The lowest 𝑚 values were found in the Persian Gulf, Arabian Platform, Esfahan-Sirjan region, and the Dasht-e-Kavir Desert in central Iran. As a second part to this study, we calculated the maximum credible earthquakes for 1 103 identified major faults by using five empirical magnitude-scaling relationships. Our results were consistent with both the observed earthquakes and the seismic potential of the various seismogenic zones of Iran. The study results can be used in future seismic hazard analyses, and have fundamental implications for mitigating seismic risk in Iran.

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The 18 August 2014 Mw 6.2 Mormori, Iran, Earthquake: A Thin-Skinned Faulting in the Zagros Mountain Inferred from InSAR Measurements

Cited by 33 publications

References 41 publications

Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence

Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence

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

Estimating the maximum earthquake magnitude in the Iranian Plateau

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