应用背景噪声互相关监测火山区地震波速度变化

doi:10.12196/j.issn.1000-3274.2024.04.002

地震 ›› 2024, Vol. 44 ›› Issue (4): 14-25.doi: 10.12196/j.issn.1000-3274.2024.04.002

应用背景噪声互相关监测火山区地震波速度变化

何玉杰^1,2, 黄金莉^1,2

1.陆内火山与地震教育部重点实验室(中国地质大学, 北京), 北京 100083;
2.中国地质大学(北京)地球物理与信息技术学院, 北京 100083

收稿日期:2024-02-06 修回日期:2024-07-02 出版日期:2024-10-31 发布日期:2024-12-16
通讯作者: 黄金莉, 教授。 E-mail: huangjl@cugb.edu.cn
作者简介:何玉杰(1993-), 男, 甘肃兰州人, 工程师, 主要从事地震观测数据处理和地下介质波速变化研究。
基金资助:
国家重点研发计划项目(2017YFC0601406)

Monitor Seismic Velocity Change in Volcanic Areas Using Ambient Seismic Noise Correlation

HE Yu-jie^1,2, HUANG Jin-li^1,2

1. Key Laboratory of Intraplate Volcanoes and Earthquakes (China University of Geosciences, Beijing), Ministry of Education, Beijing 100083, China;
2. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China

Received:2024-02-06 Revised:2024-07-02 Online:2024-10-31 Published:2024-12-16

摘要/Abstract

摘要： 本文利用从日本Hi-net地震台网和IRIS分别收集的地震连续波形资料, 采用背景噪声互相关移动窗互谱法分别测量了2014年9月27日日本御岳山火山和2018年5月4日美国夏威夷基拉韦厄火山喷发前后大约一年的相对波速变化。御岳山火山区在0.4～0.8 Hz频带下的测量结果表明, 火山喷发前约10天内平均相对波速降低了0.1%, 喷发后又开始缓慢回升; 基拉韦厄火山区在0.5～1.0 Hz频带下的测量结果显示, 该火山在大规模喷发前10天内平均地震波速降低幅度达0.5%, 直到8月4日火山喷发结束后, 平均相对波速才开始逐渐回升。结合两座火山区的地倾斜、 GPS及震源机制解结果, 表明本研究检测到的火山喷发前后相对波速的降低及回升的过程, 是对火山区浅部岩浆膨胀及收缩过程的响应。

关键词: 背景噪声, 日本御岳山火山区, 夏威夷基拉韦厄火山区, 相对波速变化, 岩浆膨胀与收缩

Abstract: Using ambient noise correlation and the moving window cross spectrum method, we detected the variations in relative seismic velocity over approximately one year before and after the eruption of the Mt. Ontake volcano in Japan on September 27, 2014, and Kilauea volcano in Hawaii, USA, on May 4, 2018, respectively, using continuous seismic data collected from the Hi-net network and IRIS. The measurement results in the 0.4~0.8 Hz frequency band for the Mt. Ontake volcanic area show that the average relative seismic velocity decreased by about 0.1% during the 10 days before the eruption and then gradually recovered after the eruption. In the Kilauea volcanic area, the measurement results in the 0.5~1.0 Hz frequency band show that the average relative seismic velocity decreased by about 0.5% during the 10 days before the large-scale eruption and then gradually recovered after the eruption ended on 4 August 2018. Combined with the results of ground tilt, GPS, and focal mechanism solutions of the two volcanic areas, it is shown that the changes in relative seismic velocity before and after the volcanic eruptions are a response to shallow magmatic inflation and deflation processes in the volcanic areas.

Key words: Ambient noise, Mt. Ontake volcanic area in Japan, Kilauea volcanic area in Hawaii, Relative seismic velocity change, Magmatic inflation and deflation

中图分类号:

P315.7

何玉杰, 黄金莉. 应用背景噪声互相关监测火山区地震波速度变化[J]. 地震, 2024, 44(4): 14-25.

HE Yu-jie, HUANG Jin-li. Monitor Seismic Velocity Change in Volcanic Areas Using Ambient Seismic Noise Correlation[J]. EARTHQUAKE, 2024, 44(4): 14-25.

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应用背景噪声互相关监测火山区地震波速度变化

Monitor Seismic Velocity Change in Volcanic Areas Using Ambient Seismic Noise Correlation

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