Crustal Seismic Anisotropy Beneath the Zagros and Central Iran

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-04-18 DOI:10.1134/s0016852124700092
Sh. Mirahmadi, A. Sadidkhouy, Gh. Javan-Doloei, N. Mohammadi
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Abstract

The study investigates the variation of shear wave anisotropy among the crustal structure of the Zagros and Central Iran. We used the waveforms of 327 tele-seismic earthquakes with magnitude greater than 5.0 (Mb) at epicentral distances between 30° and 90°, recorded by 22 broadband seismic stations in the study area. The radial and transverse components of the receiver functions in the frequency band from 0.05 to 0.5 Hz were calculated using the earthquakes recorded at each station. Considering t0 as arrival time of the Ps-converted phase on radial receiver functions in the isotropic case, we estimate the effective arrival time for the overlapping phases of the split shear waves as a function of back azimuth. Then we determined the seismic anisotropy parameters of the shear waves (φ, δt). The results show that the average splitting time in the study area varies from 0.24 to 0.65 s, which is a good constraint on the seismic anisotropy compared to the range of crustal seismic anisotropy. Analysis of the fast direction of motion shows that φ changes parallel to the direction of the surface structures and agrees with measurements of the velocity vector GPS that the deformation is rooted in shallower, brittle structures of the crust and active fault zones throughout the environment.

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扎格罗斯山脉下和伊朗中部的地壳地震各向异性
摘要 研究调查了扎格罗斯山脉和伊朗中部地壳结构中剪切波各向异性的变化。我们使用了研究地区 22 个宽带地震台记录的 327 次震级大于 5.0 (Mb)、震中距 30° 至 90° 的远震波形。利用每个台站记录的地震计算了接收函数在 0.05 至 0.5 Hz 频段的径向和横向分量。考虑到 t0 是各向同性情况下 Ps 转换相在径向接收函数上的到达时间,我们估算了作为后方位角函数的分裂剪切波重叠相的有效到达时间。然后,我们确定了剪切波的地震各向异性参数(φ、δt)。结果表明,研究区的平均分裂时间在 0.24 至 0.65 秒之间,与地壳地震各向异性范围相比,对地震各向异性有很好的约束。对快速运动方向的分析表明,φ 的变化平行于地表结构的方向,这与速度矢量 GPS 的测量结果一致,即整个环境中的形变根植于地壳较浅的脆性结构和活动断层带。
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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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