Estimation of Coda wave attenuation (Qc-1) in the North of Sanandaj-Sirjan zone, Iran

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EMAMI R.; REZAPOUR M.; REZAEI R.

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Journal: GEOSCIENCES Year:2019 | Volume:28 | Issue:112 Page(s): 91-100

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Title

Estimation of Coda wave attenuation (Qc-1) in the North of Sanandaj-Sirjan zone, Iran

Author(s)

EMAMI R. | REZAPOUR M. | REZAEI R. | Issue Writer Certificate

Keywords

Quality factorQ2

Coda wavesQ1

SanandajQ2

Sirjan zoneQ1

SingleQ1

BackQ1

ScatteringQ1

SingleQ1

IsotropicQ1

ScatteringQ1

Abstract

The attenuation of seismic waves, as a basic physical parameter is one of the important properties of the earth’ s structure. Therefore, for a realistic seismic hazard analysis and the simulation of strong ground motions and for studying the regional earth structure, the estimation of the seismic attenuation has a fundamental and inevitable role. The attenuation of the seismic waves is defined by the inverse of Quality factor (Q-1) while Quality factor (Q) is the wave transmission quality of the medium. In this study, the Quality factor was estimated by using two Single-Back-Scattering and Single-Isotropic-Scattering methods. The larger values indicate more homogeneity in the shallow layers of the earth, and therefore, these results can be used in hazard analysis assessment. For this purpose, the seismograms of earthquakes recorded at the stations of the Iranian Seismological Center (IRSC) and the International Institute of Earthquake Engineering and Seismology (IIEES) at the longitude of 48 to 50 and latitude of 38 to 40 degrees have been used in the present study. In this work, the high-quality seismograms with signal-to-noise ratios (SNR) of equal or greater than 3 and epicentral distances less than 200 km were used. The variation of coda wave attenuation was investigated in both lateral and depth, and the results were compared with the obtained values for other regions of Iran and the world. To investigate the lateral variations, after applying the band-pass filter on waveforms in 10 frequency bands, the Quality factor was estimated. Finally, the mean values of the Quality factor and frequency dependence factor in the region, using data with epicentral distances less than 200 km by using two Single-Back-Scattering and Single-Isotropic-Scattering methods obtained Qc=149 ± 9f0. 66 ± 0. 03 and Qc=152 ± 12f0. 66 ± 0. 03, respectively. The comparison of these results with the values have been obtained for Central Iran (Qc=94f0. 97), Alborz (Qc=79f1. 07) and Southeast Zagros (Qc=72f1. 19) indicate that the study area is more homogeneity in the shallow depth layers and it has less seismicity than Central Iran, Alborz, and Zagros. Also, to investigate the depth variation of attenuation in this study, the coda Quality factor Qc was estimated for 11 coda window lengths, which are taken from 10 to 60 s with an increment of 5 s. In the lower window lengths, the low Q0 values represent high heterogeneity in the shallow depths layers of the earth.

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APA: Copy

EMAMI, R., REZAPOUR, M., & REZAEI, R.. (2019). Estimation of Coda wave attenuation (Qc-1) in the North of Sanandaj-Sirjan zone, Iran. GEOSCIENCES, 28(112 ), 91-100. SID. https://sid.ir/paper/32156/en

Vancouver: Copy

EMAMI R., REZAPOUR M., REZAEI R.. Estimation of Coda wave attenuation (Qc-1) in the North of Sanandaj-Sirjan zone, Iran. GEOSCIENCES[Internet]. 2019;28(112 ):91-100. Available from: https://sid.ir/paper/32156/en

IEEE: Copy

R. EMAMI, M. REZAPOUR, and R. REZAEI, “Estimation of Coda wave attenuation (Qc-1) in the North of Sanandaj-Sirjan zone, Iran,” GEOSCIENCES, vol. 28, no. 112 , pp. 91–100, 2019, [Online]. Available: https://sid.ir/paper/32156/en

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