Zagros碰撞带上部地壳剪切波结构的局部地震瑞利波层析成像

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Shaghayegh VahidRavesh , Taghi Shirzad , Farzam Yaminifard , Mohsen Kazemnia , Simone Pilia , Mojtaba Naghavi , Habib Rahimi
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引用次数: 0

摘要

扎格罗斯褶皱冲断带是对阿拉伯-欧亚大陆碰撞的主要反应,这在伊朗产生了显著的地震活动。面波层析成像可以作为该地区地壳结构成像的一种有效工具。利用高质量局地地震波形中观测到的瑞利波频散曲线,获得了Zagros碰撞带下1 ~ 28 s的二维层析成像。随后,反演各网格点的局部伪频散曲线,得到地壳的三维速度模型。结果表明,在缝合带附近存在浅层低速构造。此外,扎格罗斯山前断裂南部的低速弯曲形状可能是由于Dezful海湾下的厚沉积盆地所致。相对而言,萨南达杰-锡尔扬和扎格罗斯高地下方较深构造的抬升可能会导致地壳中部深处的高速构造。横波速度沿扎格罗斯带的变化表明该褶皱冲断带的构造不均匀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The upper crustal shear wave structure of the Zagros collision zone from local earthquake Rayleigh wave tomography

The upper crustal shear wave structure of the Zagros collision zone from local earthquake Rayleigh wave tomography

The Zagros fold-and-thrust belt is the principal response to the Arabia–Eurasia continental collision, which generates significant seismic activity in Iran. Surface wave tomography can be a proper tool for crustal structure imaging in this region. We used observed dispersion curves of Rayleigh wave derived from high-quality local-earthquake waveforms to obtain 2D tomographic maps in the period range 1–28 s beneath the Zagros collision zone. Subsequently, local pseudo-dispersion curves for individual grid points are inverted for shear-wave velocity structure, in order to obtain a 3D velocity model of the crust. Our results indicate shallow low-velocity structures near the suture zone. Moreover, a low-velocity flexure shape in the south of the Zagros Mountain Front Fault could be due to the thick sedimentary basin beneath the Dezful embayment. Relatively an uplifting of the deeper structures beneath Sanandaj-Sirjan and the high Zagros might could be led to high-velocity structures at mid-crustal depths. The variation of shear-wave velocity along the Zagros indicates the inhomogeneous structures along this folding and thrust belt.

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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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