Crustal structure of Northwest Zagros (Kermanshah) and Central Iran (Yazd and Isfahan) using teleseismic Ps converted phases

Afsari, Narges; Sodoudi, F.; Farahmand, Fataneh Taghizadeh; Glodny, Johannes

doi:10.1007/s10950-011-9227-x

Cited by 24 publications

(13 citation statements)

References 32 publications

(28 reference statements)

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“…This depth correlates well with that obtained from our SRFs beneath the CD zone (see Fig. 7) and is compatible with those derived from previous studies (Paul et al 2006, Afsari et al 2011, Shad Manaman et al 2011. SRFs showed the Moho at 50 km depth beneath the UDMA (see Fig.…”

Section: Observationssupporting

confidence: 93%

“…(2006Paul et el. ( , 2010 and Afsari et al (2011) using P receiver functions. Beneath the ZFTB, the crust is 50 km thick (Fig.s 5b & 6b).…”

Section: Observationsmentioning

confidence: 99%

“…They interpreted this abrupt crustal thickening beneath SSZ as the result of underthrusting the crust of Zagros beneath Central Iran along the MZT. Afsari et al (2011) estimated the lateral variation of the Moho boundary beneath the Northwest Zagros and Central Iran using P receiver functions. They found a relatively flat Moho of about 42 km beneath the Northwest Zagros and Central Iran deepening toward the Sanandaj-Sirjan Metamorphic Zone and reaches 51 km, where two crusts (Zagros and Central Iran) are assumed to be superposed.…”

Section: Introductionmentioning

confidence: 99%

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New constraints on lithospheric thickness of the Iranian plateau using converted waves

et al. 2013

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Study of mantle lithosphere plays a key role to reveal predominant tectonic setting process of a region. The current geological and tectonic setting of Iran is due to the ongoing continental-continental collision of Arabian and Eurasian plates. We applied a combined P and S receiver function analysis to the teleseimic data of 9 permanent broadband seismic stations of the International Institute of Earthquake Engineering and Seismology (IIEES) located in different tectonic zones of Iranian plateau. More than 4 years of data were used to estimate the thickness of the crust and mantle lithosphere. According to our results, the crust is 50 km thick beneath the Zagros Fold and Thrust Belt (ZFTB). We found the maximum Moho depth of approximately 70 km under the Sanandaj-Sirjan zone (SSZ) indicating the overthrusting of the crust of Central Iran onto the Zagros crust along the Main Zagros Thrust (MZT). Below the northeasternmost part of the Urumieh-Dokhtar Magmatic Arc (UDMA) and Central Iran, the Moho becomes shallower and lies at 40 km depth. Towards northeast, beneath the Alborz zone, the crust is 55 km thick. Based on S receiver functions, we provided new insights into the thickness of the Arabian and Eurasian lithospheres. The location of the boundary between these plates was estimated to be beneath the SSZ, which is slightly shifted northeastward relative to the surficial expression of the MZT. Furthermore, the Arabian plate is characterized by the relatively thick lithosphere of about 130 km beneath the ZFTB reaching 150 km beneath the SSZ, where the thickest crust was also observed. This may imply that the shortening across the Zagros is accommodated by lithospheric thickening. In contrast, the UDMA and Central Iran are recognized by the thin lithosphere of about 80-85 km. This thin lithosphere may be associated with the asthenospheric upwelling caused by either lithospheric delamination or Neo-Tethys slab detachement beneath the Zagros collision zone.

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Section: Observationssupporting

confidence: 93%

“…(2006Paul et el. ( , 2010 and Afsari et al (2011) using P receiver functions. Beneath the ZFTB, the crust is 50 km thick (Fig.s 5b & 6b).…”

Section: Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New constraints on lithospheric thickness of the Iranian plateau using converted waves

et al. 2013

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“…Moho depths range from 44 to 55 km, with slightly thicker average values in the northwestern Zagros (∼50 km) than in the southeastern Zagros (∼46 km). Although our estimates of crustal thickness are averaged over ∼100‐km length scales, they broadly agree with the local crustal thickness estimates of 42–58 km determined from receiver function studies (Afsari et al, ; Hatzfeld et al, ; Paul et al, ; Tatar & Nasrabadi, ).…”

Section: Calibrated Earthquake Locationssupporting

confidence: 87%

“…The a k 135 velocity model (shown with dashed line) is used for all noncrustal phases at distances >17° (Kennett et al, ). Estimates for the thickness of the basement is taken from McQuarrie (), Molinaro et al (), Mouthereau et al (), Oveisi et al (), Allen et al (), Blanc et al (), Sherkati et al (), Abdollahie‐Fard et al (), and Casciello et al (), and for the thickness of the crust from Hatzfeld et al (), Afsari et al () and Tatar and Nasrabadi ().…”

Section: Calibrated Earthquake Locationsmentioning

confidence: 99%

Seismotectonics of the Zagros (Iran) From Orogen‐Wide, Calibrated Earthquake Relocations

et al. 2019

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We use calibrated earthquake relocations to reassess the distribution and kinematics of faulting in the Zagros range, southwestern Iran. This is among the most seismically active fold‐and‐thrust belts globally, but knowledge of its active faulting is hampered by large errors in reported epicenters and controversy over earthquake depths. Mapped coseismic surface faulting is extremely rare, with most seismicity occurring on blind reverse faults buried beneath or within a thick, folded sedimentary cover. Therefore, the distribution of earthquakes provides vital information about the location of active faulting at depth. Using an advanced multievent relocation technique, we relocate ∼2,500 earthquakes across the Zagros mountains spanning the ∼70‐year instrumental record. Relocated events have epicentral uncertainties of 2–5 km; for ∼1,100 of them we also constrain origin time and focal depth, often to better than 5 km. Much of the apparently diffuse catalog seismicity now collapses into discrete trends highlighting major active faults. This reveals several zones of unmapped faulting, including possible conjugate left‐lateral faults in the central Zagros. It also confirms the activity of faults mapped previously on the basis of geomorphology, including oblique (dextral‐normal) faulting in the NW Zagros. We observe a primary difference between the Lurestan arc, where seismicity is focused close to the topographic range front, and the Fars arc, where out‐of‐sequence thrusting is evident over a width of ∼100–200 km. We establish a focal depth range of 4–25 km, confirming earlier suggestions that earthquakes are restricted to the upper crust but nucleate both within and beneath the sedimentary cover.

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Seismotectonics of the Bitlis–Zagros Fold and Thrust Belt in Northern Iraq and Surrounding Regions from Moment Tensor Analysis

Abdulnaby

Mahdi

Numan

et al. 2013

Pure Appl. Geophys.

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Crustal structure of Northwest Zagros (Kermanshah) and Central Iran (Yazd and Isfahan) using teleseismic Ps converted phases

Cited by 24 publications

References 32 publications

New constraints on lithospheric thickness of the Iranian plateau using converted waves

New constraints on lithospheric thickness of the Iranian plateau using converted waves

Seismotectonics of the Zagros (Iran) From Orogen‐Wide, Calibrated Earthquake Relocations

Seismotectonics of the Bitlis–Zagros Fold and Thrust Belt in Northern Iraq and Surrounding Regions from Moment Tensor Analysis

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