| 基于环境噪声测试的隐伏断层场地H/V谱比特征分析 |
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| 引用本文： | 胡鹏,罗永红,宋志宾,南凯.基于环境噪声测试的隐伏断层场地H/V谱比特征分析[J].地震学报,2022,44(3):528-537. |
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| 作者姓名： | 胡鹏 罗永红 宋志宾 南凯 |
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| 作者单位： | 中国成都 610059 成都理工大学地质灾害防治与地质环境保护国家重点实验室 |
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| 基金项目： | 国家自然科学基金创新研究群体科学基金（41521002）、国家自然科学基金面上基金（42077257）和地质灾害防治与地质环境保护国家重点实验室开放基金（SKLGP2019K024）联合资助 |
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| 摘 要： | 基于四川石棉县安顺场隐伏断层穿越区的60余次环境噪声测试，探讨了隐伏断层对环境噪声H/V谱比特征的影响，并且通过研究区所获卓越频率对其覆盖层厚度进行估算，以覆盖层厚度的变化揭示了隐伏断层的行迹。结果显示:① 在排除可能受河流影响引发的高频区后，隐伏断层带处的H/V谱比曲线多呈现高频、低放大系数和多峰值频率等特点；② 覆盖层厚度在部分强风化区和河流高频区存在5—10 m的差异；③ 环境噪声阵列反演所得部分覆盖层厚度变化较大区域与隐伏断层的形迹吻合。
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| 关 键 词： | 环境噪声 H/V谱比 卓越频率 隐伏断层 |
| 收稿时间： | 2021-04-22 |
H/V spectral ratio characteristics of hidden fault site based on ambient noise test |
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| Institution: | State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection，Chengdu University of Technology，Chengdu 610059，China |
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| Abstract: | Ambient noise research has become a hot spot in geological exploration, but the research on ambient noise in alpine and gorge regions of Southwest China is still in its infancy. Based on more than 60 ambient noise tests conducted in the hidden fault crossing area of Anshun field in Shimian county, Sichuan, this paper explores the influence of hidden faults on the H/V spectral ratio characteristics of ambient noise. The results show that after excluding predominant-frequency areas that may be caused by the influence of rivers, the H/V spectral ratio curves are characterized by high frequency, low H/V spectrum ratio, and multi peak frequency on the fault zone. In addition, we estimated the thickness of overburden in this field by analyzing the predominant frequency of this test, and the calculation results of the overburden layer show thickness difference of 5?10 m in some strong weathering areas and high frequency areas of rivers. Moreover some areas with large changes in overburden thickness obtained by ambient noise array inversion are consistent with the trace distribution of the hidden faults. This study attempts to reveal the traces of hidden faults by using the ambient noise method, which provides a new reference basis for the exposure of hidden faults. |
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