利用远震接收函数探测襄樊台下方地壳厚度及泊松比

刘迁; 赵瑞; 栗宁

doi:10.3969/j.issn.2096-7780.2021.05.005

利用远震接收函数探测襄樊台下方地壳厚度及泊松比

doi: 10.3969/j.issn.2096-7780.2021.05.005

刘迁^{1, 2, ,},
赵瑞^{1, 2},
栗宁^{1, 2}

1.
中国地震局地震研究所（地震大地测量重点实验室），武汉 430071
2.
湖北省地震局，武汉 430071

基金项目: 湖北省地震局基础科研基金项目（IS201866292-34）和中国地震局地震研究所所长基金(IS201856187)联合资助

详细信息

通讯作者:
刘迁（1989-），男，工程师，主要从事地震资料分析与处理方面的工作。E-mail：qliu2013@163.com

中图分类号: P315.2
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出版历程
- 收稿日期: 2021-02-18
- 修回日期: 2021-03-24
- 网络出版日期: 2021-07-05
- 刊出日期: 2021-05-25

Crustal thickness and Poisson’s ratio beneath Xiangfan seismic station revealed by teleseismic receiver functions

Qian Liu^{1, 2
, ,},
Rui Zhao^{1, 2},
Ning Li^{1, 2}

1.
Institute of Seismology, China Earthquake Administration （Key Laboratory of Earthquake Geodesy）, Wuhan 430071, China 　　　　　　　　　　　　　　　　　　　
2.
Hubei Earthquake Agency, Wuhan 430071, China

摘要

摘要: 利用襄樊台2015—2018年记录的震中距30°—90°，震级5.5级以上（含5.5级）的高信噪比远震波形事件，通过时间域反褶积方法提取台站接收函数，并用H-k扫描叠加方法得到台站下方地壳厚度和波速比。结果表明，襄樊台下方地壳厚度为35 km，略高于大陆地壳平均厚度33 km，处于西部山区厚地壳与中东部薄地壳的过渡地带。泊松比偏低，存在因区域内地壳应力积累发生微小地震的可能性。
- 接收函数 /
- H-k叠加 /
- 地壳厚度 /
- 波速比 /
- 泊松比
Abstract: In this study, we used high signal-to-noise ratio teleseismic wave form data with an epicenter 30°—90° and the magnitude above 5.5 （including 5.5） of Xiangfan seismic station recorded during 2015—2018 to calculate the receiver functions using the time domain deconvolution method. The crustal thickness and v_P/v_S velocity ratio was obtained with the H-k stacking method. The results reveal that the crustal thickness beneath Xiangfan seismic station is 35 km, slightly higher than the average continental crustal thickness of 33 km. It is located in the transition zone between the thick crustal thickness of the western mountain area and the thin crustal thickness of the central and eastern parts. Poisson’s ratio is low and there is the possibility of minor earthquake due to the accumulation of regional crustal stress.
- receiver function /
- H-k stacking /
- crustal thickness /
- velocity ratio /
- Poisson’s ratio

HTML全文

图 1 台站周边断层分布图

F₁：襄樊—广济断裂；F₂：钟祥断裂带；F₃：南漳断裂带；F₄：青峰断裂；F₅：竹山断裂；F₆：远安断裂带；F₇：雾渡河断裂；F₈：信阳—金寨断裂

Figure 1. Distribution of faults around Xiangfan seismic station

F₁：Xiangfan-Guangji fault；F₂：Zhongxiang fault zone；F₃：Nanzhang fault zone；F₄：Qingfeng fault； F₅：Zhushan fault；F₆：Yuanan fault zone；F₇：Wuduhe fault；F₈：Xinyang-Jinzhai fault

下载: 全尺寸图片幻灯片

图 2 远震事件分布图

Figure 2. Locations of the teleseismic events

下载: 全尺寸图片幻灯片

图 3 叠加后的接收函数以及H-k扫描叠加结果

Figure 3. Receiver functions after stacking and the H-k stacking result

下载: 全尺寸图片幻灯片

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