Qp, Qs, Qc, Qi, and $$Q_{{s_{c} }}$$ Attenuation Parameters in the Zagros Region, Iran

Talebi, Amir; Rahimi, Habib; Moradi, Ali; Mirzaei, Mahmoud; Koulakov, I.

doi:10.1007/s00024-021-02879-9

Cited by 10 publications

(6 citation statements)

References 63 publications

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“…According to their observation, the average values of 93, 110, 165, 325, and 571 have been obtained at five central-frequencies of 1.5, 3, 6, 12, and 18 Hz respectively using data recorded within an epicentral distance of 100 km. Considering the magnitude range of the selected earthquakes (Mw ≥ 5.0) and analyzing the P-wave displacement spectra, the dominant corner frequency range does not exceed 6 to 7 Hz which corresponds to values in the range 93–165 according to the study by Talebi et al 39 . In our study, considering possible uncertainties on the estimation of , we decided to explore the source parameter sensitivity to seismic attenuation with values ranging from 50 to 200, although Figs.…”

Section: Resultsmentioning

confidence: 96%

“…As for the anelastic attenuation correction, using a previously known P-wave, frequency independent quality factor for the region of concern, we refer to the study of Talebi et al 39 , in which different attenuation factors are estimated using the extended coda normalization method by analyzing more than 6421 local events with a magnitude range of 3 to 5.5 that occurred from 2006 to 2019 within the studied area. Looking at the spatial variation of the quality factor, Talebi et al 39 concluded the higher attenuation in the northern parts of the Zagros region than in the southern part. Note that there is no overlap between this high-attenuation area and region including our dataset.…”

Section: Resultsmentioning

confidence: 99%

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Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement

Nazeri,

Abdi,

Ismail

et al. 2023

Sci Rep

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The rupture process of the recent moderate-to-large earthquakes in the Zagros area along the Iran plateau is investigated by analysing the strong motion data provided by the Iranian Building and Housing Research Centre (BHRC). The selected dataset includes the largest and deadliest 2017 Mw 7.3, Iran-Iraq (Ezgeleh) earthquake. The earthquake source parameters (moment magnitude, rupture duration and length, average slip, and static stress drop) are determined using a time-domain, parametric modelling technique based on the time evolution of the P-wave displacement signals. The earthquake source parameters are calculated from simulated triangular moment-rate functions assuming the circular source models for a constant rupture velocity. The anelastic attenuation effect is modelled through the independent frequency-Q parameter ranging from 50 to 200 and accounted for by a post-processing procedure that retrieves the attenuation-corrected, moment-rate triangular shape. Results show that the average static stress-drop with different $${Q}_{P}$$ Q P , varies between <Δσ> = 0.9 (0.7–1.2) MPa and <Δσ> = 1.6 (1.2–2.0) MPa. Overall, in this research, the rupture radius/length empirically scales with the seismic moment with a self-similar, near-constant stress drop of about 1 MPa. Assuming a circular rupture model for the Ezgeleh earthquake, we estimate a moment magnitude of 6.9, rupture duration of 7 s, source radius of 16 km, average slip of about 2 m and static stress drop of 3.4 MPa.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement

Nazeri,

Abdi,

Ismail

et al. 2023

Sci Rep

Self Cite

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show abstract

“…As for the anelastic attenuation correction, using a previously known P-wave, frequency independent quality factor for the region of concern, we refer to the study of Talebi et al, [38], in which different attenuation factors are estimated using the extended coda normalization method by analyzing more than 6421 local events with a magnitude range of 3 to 5.5 that occurred from 2006 to 2019 within the studied area. Looking at the spatial variation of the quality factor, Talebi et al, [38] concluded the higher attenuation in the northern parts of the Zagros region than in the southern part. According to their observation, the average 𝑄 𝑃 values of 93, 110, 165, 325, and 571…”

Section: Figures 3a and 3bmentioning

confidence: 99%

“…have been obtained at five central-frequencies of 1.5, 3, 6, 12, and 18 Hz respectively using data recorded within an epicentral distance of 100 km. Considering the magnitude range of the selected earthquakes (Mw≥5.0) and analyzing the P-wave displacement spectra, the dominant corner frequency range is not exceeding 6 to 7 Hz that corresponds to 𝑄 𝑃 values in the range 93-165 according to the study by Talebi et al, [38]. In our study, considering possible uncertainties on the estimate of Qp, we decided to explore the source parameter sensitivity to seismic attenuation with 𝑄 𝑃 values ranging from 50 to 200, although Figures 3-5 present the result for the case 𝑄 𝑃 = 100.…”

Section: Figures 3a and 3bmentioning

confidence: 99%

Earthquake Source Parameters in Zagros Region (Iran) From the Time -Evolutive P-wave Displacement

Nazeri

Abdi

Ismail

et al. 2023

Preprint

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The rupture process of the recent moderate-to-large earthquakes in the Zagros area along the Iran plateau is investigated by analysing the strong motion data provided by the Iranian Building and Housing Research Centre (BHRC). The selected dataset includes the largest and deadliest 2017 Mw 7.3, Iran-Iraq (Ezgeleh) earthquake. The earthquake source parameters (moment magnitude, rupture duration and length, average slip, and static stress drop) are determined using a time-domain, parametric modelling technique based on the time evolution of the P-wave displacement signals. The earthquake source parameters are calculated from simulated triangular moment-rate functions assuming the circular source models for a constant rupture velocity. The anelastic attenuation effect is modelled through the independent frequency-Q parameter ranging from 50 to 200 and accounted for by a post-processing procedure that retrieves the attenuation-corrected, moment-rate triangular shape. Results show that the average static stress-drop with different ${Q}_{P}$, varies between < Δ𝜎>=0.9 (0.7 − 1.2) MPa and < Δ𝜎>=1.6 (1.2 − 2.0) MPa. Assuming a circular rupture model for Ezgeleh earthquake, we estimate a moment magnitude of 6.9, rupture duration of 7 seconds, source radius of 16 km, average slip of about 2 m and static stress drop of 3.4 MPa.

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“…Spatial variation in coda Q in the northeastern part of Niigata-Kobe Tectonic Zone, central Japan, was explored by Dojo and Hiramatsu (2017). Several studies have been carried out over a decade on the Quality factor features in the Iranian plateau (Ma'hood and Hamzehloo 2009;Rahimi et al 2010;Gholamzadeh et al 2014;Ahmadzadeh Iran Doust et al 2016;Naghavi et al 2017;Amiri Fard et al 2019;Talebi et al 2021). Rahimi et al (2010) Q that show a good correlation with Quaternary sediments and the Sahnad, Sabalan volcanic zone.…”

Section: Introductionmentioning

confidence: 99%

Coda wave attenuation in the Zagros collision zone in southwest of Iran and its tectonic implications

Talebi,

Rahimi,

Moradi

2024

Preprint

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The Zagros collision zone, located in the southwest of Iran, is experiencing to an immoderately large number of seismic hazards caused by the convergence between the two Arabia and micro-plate of central Iran. The coda Q have been widely used as a vital parameter to investigate the different tectonic features as well as seismic risk assessments. In this study, we have analyzed the spatial variation of coda wave attenuation in the Zagros region, to evaluate the different geological features affecting the seismic wave’s propagation. Our dataset comprises 87295 coda records of about 6421 local earthquakes, with magnitude greater than three recorded by 36 seismic stations in the period of 2006 to 2020. we have applied a very simple regionalization method to mapping spatial distribution of in Zagros area. The spatial distributions of coda Q have a positive correlation with the tectonically and lithology of the interested area. According to the results, three primary elements have been suggested as major controlling factors of variation of seismic Coda waves in different parts of the Zagros area. These factors include: 1) intra-crustal relamination process (crustal channeling), 2) 12 km thickness of sediment-filled by fluid (oil and gas) and 3) Hormoz salt (salt domes). Our results also revealed that the suture zone of Zagros (the Main Zagros Thrust fault, MZT) can be considered as a border in which the distribution of coda wave is different on the sides of the fault.

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Qp, Qs, Qc, Qi, and $$Q_{{s_{c} }}$$ Attenuation Parameters in the Zagros Region, Iran

Cited by 10 publications

References 63 publications

Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement

Earthquake source parameters in Zagros region (Iran) from the time-evolutive P-wave displacement

Earthquake Source Parameters in Zagros Region (Iran) From the Time -Evolutive P-wave Displacement

Coda wave attenuation in the Zagros collision zone in southwest of Iran and its tectonic implications

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