Moho depth variations and Vp/Vs ratios in the seismotectonic zones of Central Iran, Eastern Iran, and Makran: using a modified Zhu and Kanamori method

Nasrabadi, Afsaneh; Sepahvand, Mohammad Reza; Dadjo, Zahra

doi:10.1007/s10950-019-09837-y

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…Moho depth changes from 56 km beneath the western part of Central Iran to 40 km in Central Iran and 38 km in the East. Also the crustal thickness beneath CHBR station located in Makran is 31 km (Nasrabadi et al 2019). The crust has an average thickness of 42 km beneath Zagros fold, thrust belt and the Central domain.…”

Section: Geometrical Spreading (B) and The Anelastic Attenuation (C)mentioning

confidence: 99%

Local and regional P-wave spectral attenuation model for Iran

Bajestani

Ansari

Karkooti

2020

Geophysical Journal International

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Summary A robust frequency-dependent local and regional P wave attenuation model is estimated for continental paths in the Iranian Plateau. In order to calculate the average attenuation parameters, 46337 vertical-component waveforms related to 9267 earthquakes, which are recorded at the Iranian Seismological Center (IRSC) stations, have been selected in the distance range 10 to 1000 km. The majority of the event's magnitudes are less than 4.5. This collection of records provides high spatial ray path coverage. Results indicate that the shape of attenuation P wave curve versus distance is not uniform and has three distinct sections with hinges at 90 and 175 km. A tri-linear model for attenuation of P wave amplitude in the frequency range 1–10 Hz is proposed in this study. Fourier spectral amplitudes are found to decay as R−1.2 (where R is hypocentral distance), corresponding to geometric spreading within 90 km from the source. There is a section from 90 to 175 km, where the attenuation is described as R0.8, and the attenuation is described well beyond 175 km by R−1.3. Moreover, the average quality factor for Pg and Pn waves (QPg and QPn), related to anelastic attenuation is obtained as Qpg = (54.2 ± 2.6)f(1.0096±0.07) and Qpn = (306.8 ± 7.4)f (0.51±0.05). There is a good agreement between the results of the model and observations. Also, the attenuation model shows compatibility with the recent regional studies. From the results it turns out that the amplitude of P waves attenuates more rapidly in comparison with the global models in local distances.

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Section: Geometrical Spreading (B) and The Anelastic Attenuation (C)mentioning

confidence: 99%

Local and regional P-wave spectral attenuation model for Iran

Bajestani

Ansari

Karkooti

2020

Geophysical Journal International

View full text Add to dashboard Cite

show abstract

“…The maximum Moho depth was estimated along the Zagros Mountains belt beneath the Sanandaj-Sirjan Zone (SSZ); however, the thinnest crust of about 33 km is estimated beneath the Makran subduction zone. Also [ 27 ] estimated the Variation of the Moho depth and Vp/Vs ratio beneath Central Iran, Eastern Iran, and Makran regions using receiver functions analysis. They estimated the maximum depth of 64 km for the NGRK station in the Zagros belt and a minimum of 30 km for the TNSJ station south of Dasht-e Kavir [ 28 ].…”

Section: Introductionmentioning

confidence: 99%