Deep structure of the Alborz Mountains by joint inversion of P receiver functions and dispersion curves

Rastgoo, Mehdi; Rahimi, Habib; Motaghi, Khalil; Shabanian, Esmaeil; Romanelli, Fabio; Panza, G. F.

doi:10.1016/j.pepi.2018.01.011

Cited by 25 publications

(18 citation statements)

References 32 publications

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“…In the past few years, crustal structure has been studied in different parts of the Middle-East region using receiver function analysis and surface-wave tomography (e.g. Zor et al, 2003;Paul et al, 2006Paul et al, , 2010Hammond et al, 2011;Vanacore et al, 2013;Delph et al, 2015;Tang et al, 2018Tang et al, , 2019Rastgoo et al, 2018;Karabulut et al, 2019). Warren et al (2013) and Delph et al (2015) investigated the crustal structure of the Turkish-Anatolian Plateau using ambient-noise tomography, but their models do not have adequate resolution along the outer limits of the study area because they only used stations located inside Turkey.…”

Section: Introductionmentioning

confidence: 99%

Crustal and uppermost mantle shear wave velocity structure beneath the Middle East from surface wave tomography

Kaviani

Ambert

Moradi

et al. 2020

Geophysical Journal International

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SUMMARY We have constructed a 3-D shear wave velocity (Vs) model for the crust and uppermost mantle beneath the Middle East using Rayleigh wave records obtained from ambient-noise cross-correlations and regional earthquakes. We combined one decade of data collected from 852 permanent and temporary broad-band stations in the region to calculate group-velocity dispersion curves. A compilation of >54 000 ray paths provides reliable group-velocity measurements for periods between 2 and 150 s. Path-averaged group velocities calculated at different periods were inverted for 2-D group-velocity maps. To overcome the problem of heterogeneous ray coverage, we used an adaptive grid parametrization for the group-velocity tomographic inversion. We then sample the period-dependent group-velocity field at each cell of a predefined grid to generate 1-D group-velocity dispersion curves, which are subsequently inverted for 1-D Vs models beneath each cell and combined to approximate the 3-D Vs structure of the area. The Vs model shows low velocities at shallow depths (5–10 km) beneath the Mesopotamian foredeep, South Caspian Basin, eastern Mediterranean and the Black Sea, in coincidence with deep sedimentary basins. Shallow high-velocity anomalies are observed in regions such as the Arabian Shield, Anatolian Plateau and Central Iran, which are dominated by widespread magmatic exposures. In the 10–20 km depth range, we find evidence for a band of high velocities (>4.0 km s–1) along the southern Red Sea and Arabian Shield, indicating the presence of upper mantle rocks. Our 3-D velocity model exhibits high velocities in the depth range of 30–50 km beneath western Arabia, eastern Mediterranean, Central Iranian Block, South Caspian Basin and the Black Sea, possibly indicating a relatively thin crust. In contrast, the Zagros mountain range, the Sanandaj-Sirjan metamorphic zone in western central Iran, the easternmost Anatolian plateau and Lesser Caucasus are characterized by low velocities at these depths. Some of these anomalies may be related to thick crustal roots that support the high topography of these regions. In the upper mantle depth range, high-velocity anomalies are obtained beneath the Arabian Platform, southern Zagros, Persian Gulf and the eastern Mediterranean, in contrast to low velocities beneath the Red Sea, Arabian Shield, Afar depression, eastern Turkey and Lut Block in eastern Iran. Our Vs model may be used as a new reference crustal model for the Middle East in a broad range of future studies.

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Section: Introductionmentioning

confidence: 99%

Crustal and uppermost mantle shear wave velocity structure beneath the Middle East from surface wave tomography

Kaviani

Ambert

Moradi

et al. 2020

Geophysical Journal International

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“…Farrokhi et al [2015] reported the existence of shallow Lithosphere-Asthenosphere Boundary (LAB) at depth of 78 km and change in the elastic properties due to the partial melting of the oceanic crust of the South Caspian basin which is very well confirm our results. The study of Rastgoo et al [2018] also shows a low velocity zone at depth range of 50-100 km for WA. Their results support the lithospheric delamination model proposed by Shabanian et al [2012] for relation of this low velocity zone to the raised hotter mantle.…”

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confidence: 71%

“…The variations of Q 0 and n versus lapse time for two datasets is depicted in Figure 7 and Figure 8. As it can be seen in Figure 7-a, the Q 0 values of Zagros and SSZ become larger than those of WA and NWCI at lapse time about 20 s. The average depth at this lapse time is about 75 km, and it approximately coincides with a low velocity zone beneath WA and NWCI and with a high velocity (Arabian lithosphere) zone beneath Zagros and SSZ [Sodoudi et al, 2009;Mohammadi et al, 2013;Motaghi et al, 2017;Rastgoo et al, 2018].…”

mentioning

confidence: 76%

Coda wave attenuation's dependency on Lapse time and frequency in west of Iran plateau using local earthquakes

Fard¹,

Doloei

Farrokhi³

et al. 2020

Annals of Geophysics

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“…A brief description is provided below of the procedure used for joint inversion of stacked receiver function and surface wave dispersion. The procedure was described with more details by Motaghi et al (2015), Motaghi, Shabanian, and Kalvandi (2017), and Rastgoo et al (2018). The program joint96 was employed to invert data to S velocity model.…”

Section: Inversion Proceduresmentioning

confidence: 99%

Crustal Structure of the Mesopotamian Plain, East of Iraq

et al. 2020

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The crustal structure of Iraq was investigated through analyzing teleseismic data from 12 new seismic stations. Three seismic stations are located within the Zagros Fold-Thrust Belt, and nine are within the Mesopotamian Plain. Joint inversion of P wave receiver function and Rayleigh wave dispersion data were employed to resolve S wave velocity structure models beneath each station. Combining these models with available Moho depths within and around the study area reveals that the Moho depth is smoothly increasing from the Arabian platform toward the Zagros Mountains. An exceptional deeper root is observed near the eastern edge of the Mesopotamian Plain where sedimentary pile is the thickest. This root was interpreted as a structure inherited from the successive Mesozoic rifting of the NE Arabian platform enhanced by sedimentary loading and progressive subsidence. A low-velocity uppermost mantle was observed beneath the Arabian Foredeep attesting the existence of a low-strength lithospheric mantle beneath the region southwest from the Zagros deformation front. The weak rheology of the uppermost mantle may have allowed local sinking of the crust and deepening of the Moho boundary due to vertical loading and the Late Miocene lateral contraction.

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Deep structure of the Alborz Mountains by joint inversion of P receiver functions and dispersion curves

Cited by 25 publications

References 32 publications

Crustal and uppermost mantle shear wave velocity structure beneath the Middle East from surface wave tomography

Crustal and uppermost mantle shear wave velocity structure beneath the Middle East from surface wave tomography

Coda wave attenuation's dependency on Lapse time and frequency in west of Iran plateau using local earthquakes

Crustal Structure of the Mesopotamian Plain, East of Iraq

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