用尾波衰减和面波层析成像研究伊朗西部地壳结构

IF 1.9 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Somayeh Shakiba , Rouhollah Amiri Fard , Mojtaba Namvaran , Samane Asadi , Majid Mahood
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引用次数: 0

摘要

通过对尾波衰减和瑞利波群速度的解释,探讨了控制伊朗高原西部地壳结构的过程,并确定了萨汉德和萨巴兰与地壳浅热点构造的相关性。考虑到地震波衰减对热结构比速度更敏感,它提供了关于地震速度的额外信息,有助于识别成分和热结构。研究人员利用24个宽带地震台站记录的370次地震事件,绘制了6个周期的瑞利波层析图:5、10、15、20、25和30秒。此外,对9800多个局部事件进行了研究,利用多重散射方法估计了尾波衰减的横向变化。在固定的窗长为20 s的条件下,从起始时间开始考察不同的延时时间,结果表明,延时70 s可以提供稳定的质量控制指标,且与震中距离无关。通过对区域内速度和衰减的估算,得出萨汉德山下的低速(高衰减)区域(以5-s周期探测)与安纳托利亚板块和阿拉伯板块碰撞形成的地壳下岩浆房有关。研究区东部的浅层低速区(5-s周期探测到,较长时间消失)可能与第四纪近地表岩浆聚集和(或)上地壳升温有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An investigation on the crustal structure using coda wave attenuation and surface wave tomography in Western part of Iran
We interpret coda wave attenuation and Rayleigh wave group velocity to investigate the processes controlling the crustal structure beneath the western part of Iranian plateau and to determine the relevance of the Sahand and Sabalan to shallow crustal hot spot-like structures. Given that seismic wave attenuation is more sensitive to the thermal structure than the velocity, it provides additional information on the seismic velocity and helps identify compositional and thermal structures.
A total of 370 events recorded at 24 broadband seismic stations were used to create Rayleigh wave tomographic maps for six periods: 5, 10, 15, 20, 25, and 30 s. Moreover, more than 9800 local events were investigated to estimate lateral variations of the coda wave attenuation using multiple-scattering method. After examining different lapse times from the origin time with a fixed window length of 20 s, the results showed that a lapse time of 70 s provides stable QC indices, which were independent of the distance to the epicenter. After estimating the velocity and attenuation within the area, it was figured out that the low-velocity (high-attenuation) region underlying the Sahand Mountain (detected with a 5-s period) is related to the magma chamber beneath the crust resulting from the Anatolian and Arabian plates' collision. A shallow low-velocity region in the eastern part of the study area (detected with a 5-s period and disappeared for longer periods) might be associated with the Quaternary near-surface magma accumulations and/or upper crustal warm-ups.
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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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