Landers地震周边区域速度结构的时移层析成像研究

doi:10.12196/j.issn.1000-3274.2024.04.004

地震 ›› 2024, Vol. 44 ›› Issue (4): 45-61.doi: 10.12196/j.issn.1000-3274.2024.04.004

Landers地震周边区域速度结构的时移层析成像研究

刘亚茹¹, 石玉涛², 贺茜君¹, 周艳杰¹, 李静爽³, 黄雪源¹

1.北京工商大学数学与统计学院, 北京 100048;
2.中国地震局地震预测研究所, 北京 100036;
3.中国矿业大学(北京)理学院, 北京 100084

收稿日期:2024-02-28 修回日期:2024-04-25 出版日期:2024-10-31 发布日期:2024-12-16
通讯作者: 黄雪源, 副教授。 E-mail: huangxueyuan@btbu.edu.cn;石玉涛, 副研究员。 E-mail: shiyutao3995@126.com
作者简介:刘亚茹(1999-), 女, 河南驻马店人, 硕士研究生, 主要从事地震数据处理与层析成像研究。
基金资助:
国家自然科学基金项目(42330801)

The Velocity Structures of Surrounding Area of M_S7.3 Landers Earthquake by Seismic Time-evolving Tomography

LIU Ya-ru¹, SHI Yu-tao², HE Xi-jun¹, ZHOU Yan-jie¹, LI Jing-shuang³, HUANG Xue-yuan¹

1. School of Mathematics and Statistics, Beijing Technology and Business University, Beijing 100048, China;
2. Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;
3. School of Sciences, China University of Mining & Technology (Beijing), Beijing 100084, China

Received:2024-02-28 Revised:2024-04-25 Online:2024-10-31 Published:2024-12-16

摘要/Abstract

摘要： 利用基于程函方程的伴随走时层析成像方法对1992年Landers 7.3级地震震中周边区域的地壳进行时移层析成像研究, 反演得到了不同时间窗口三维高分辨率P波和S波速度结构, 并在此基础上分析了该区域的地质构造、速度结构与地震活动之间的相关性。结果表明, Landers地震震源及周边区域的速度结构具有显著的横向非均匀性, 近地表的非均匀性与地表地质构造相关, 如盆地、断层显示相对低速异常, 主要山脉显示相对高速异常。区域内地震发生、地震分布与速度结构的不均匀性密切相关, 绝大多数地震发生于高、低速异常的过渡带或者相对高速异常内; 不同时间窗口中大地震附近的速度结构存在较为明显的差异, 例如, 在第二个时间窗口中Landers地震和发生于该区域的Anza地震附近波速变慢, 这可能是因为大地震发生后附近的地质构造改变引起速度变化。

关键词: 地震层析成像, 时移层析成像, Landers地震, 速度结构

Abstract: In this study, we utilized the adjoint-state traveltime tomography based on eikonal equation to invert the surrounding area of M_S7.3 Landers earthquake by time-evolving method. The inversion obtained high-resolution three-dimensional P-wave and S-wave velocity structures for different time windows. The correlation among the geological structures and velocity structures of the study area and seismic activity were analyzed. The results indicated that the velocity structure in the Landers earthquake source area and its surrounding area exhibited significant lateral heterogeneities, which was well consistent with the geological structure near surface, basins and faults showing relatively low velocity anomalies, and major mountain ranges showing relatively high velocity anomalies. The occurrence and distribution of earthquakes in the region were closely related to the lateral heterogeneity of the velocity structure, with most earthquakes occurring within high-velocity anomalies or transition zones between high- and low-velocity anomalies. There are significant differences for the velocity structure near large earthquakes in different time windows. For example, in the second time window, the velocities near the Landers and Anza earthquakes became slow down, possibly due to the changes in the geological structure nearby after the large earthquakes, which in turn caused changes in velocity.

Key words: Seismic tomography, Time-evolving method, Landers earthquake, Velocity structures

中图分类号:

P315.7

刘亚茹, 石玉涛, 贺茜君, 周艳杰, 李静爽, 黄雪源. Landers地震周边区域速度结构的时移层析成像研究[J]. 地震, 2024, 44(4): 45-61.

LIU Ya-ru, SHI Yu-tao, HE Xi-jun, ZHOU Yan-jie, LI Jing-shuang, HUANG Xue-yuan. The Velocity Structures of Surrounding Area of M_S7.3 Landers Earthquake by Seismic Time-evolving Tomography[J]. EARTHQUAKE, 2024, 44(4): 45-61.

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Landers地震周边区域速度结构的时移层析成像研究

The Velocity Structures of Surrounding Area of M_S7.3 Landers Earthquake by Seismic Time-evolving Tomography

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Landers地震周边区域速度结构的时移层析成像研究

The Velocity Structures of Surrounding Area of MS7.3 Landers Earthquake by Seismic Time-evolving Tomography

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The Velocity Structures of Surrounding Area of M_S7.3 Landers Earthquake by Seismic Time-evolving Tomography