2025年缅甸M7.9级震源区地震波速变化

doi:10.3799/dqkx.2025.193

2025年缅甸M7.9级震源区地震波速变化

doi: 10.3799/dqkx.2025.193

1 辽宁工程技术大学矿业学院，辽宁阜新 123000
2 应急管理部国家自然灾害防治研究院，北京 100085
3 中国地质大学(北京)地球物理与信息技术学院，北京 100083

基金项目:

国家自然科学基金(42274129)

详细信息

作者简介:
吕子强(1982-), 男, 副教授, 主要从事全波形反演及地震监测等研究。E-mail:ziqianglyu@sina.com，ORCID：0000-0003-3777-2090

中图分类号: P315
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出版历程
- 收稿日期: 2025-06-23
- 网络出版日期: 2025-10-15

Seismic Velocity Changes of the 2025 Myanmar M7.9 Earthquake

1. College of Mining, Liaoning Technical University, Fuxin 123000 China
2. Key Laboratory of Crustal Dynamics, National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China
3. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China

摘要

摘要: 地震波速度变化是表征地下介质应力状态演化的关键指标，对理解地震孕育机制、破裂过程及震后调节行为具有重要意义。本文利用2025年3月28日缅甸M7.9级地震震源区4个固定台站的连续波形数据，采用背景噪声自相关方法分析了地震波速在震前、同震及震后三个阶段的动态变化特征。研究结果表明，在0.1-2 Hz频段范围内，震前阶段所有台站均观测到显著的地震波速下降现象，推测可能与实皆大型走滑断裂带在临震阶段的预滑活动或介质物理性质的渐进性改变有关。同震阶段地震波速变化呈现明显的空间差异性，震中距较近的台站表现出更大的波速变化幅度，表明近场区域受强地面运动的影响更为显著。震后阶段地震波速随时间呈现逐渐恢复的趋势，可能反映了台站下方介质的自愈合过程。本研究结果为深入认识大型走滑断裂的孕震机理及震后介质愈合机制提供了新的观测依据。
- 缅甸M7.9级地震 /
- 自相关函数 /
- 地震波速变化 /
- 实皆断裂
Abstract: Seismic velocity changes serve as a crucial indicator for characterizing the evolution of stress states in subsurface structure, providing significant insights into earthquake nucleation mechanisms, rupture processes, and postseismic adjustments. This study utilizes continuous waveform data from four permanent stations located in the source region of the March 28, 2025, Myanmar M7.9 earthquake. By applying the ambient noise autocorrelation method, we analyze the dynamic changes in seismic wave velocity during the pre-seismic, co-seismic, and post-seismic phases. The results reveal that all stations observed a notable decrease in seismic wave velocity within the frequency range of 0.1-2 Hz during the pre-seismic phase, which may be attributed to preseismic slip or progressive changes in the physical properties of the media along the Sagaing large-scale strike-slip fault zone. During the co-seismic phase, the velocity changes exhibit significant spatial heterogeneity, with stations closer to the epicenter showing more pronounced variations, indicating stronger near-field ground motion effects. In the post-seismic phase, the wave velocity gradually recovers over time, likely reflecting the self-healing process of the subsurface media beneath the seismic stations. These findings provide new observational evidence for understanding the seismogenic mechanisms of large strike-slip faults and the postseismic healing processes of subsurface structure.
- Myanmar M7.9 earthquake /
- Autocorrelation /
- Seismic velocity changes /
- Sagaing fault

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