2025年缅甸<i>M</i>7.9级震源区地震波速变化

吕子强; 张紫琼; 雷建设; 陈召曦; 刘珈君; 侯利民

doi:10.3799/dqkx.2025.193

Volume 51 Issue 1

Jan. 2026

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Article Navigation > Earth Science > 2026 > 51(1): 215-225

Lyu Ziqiang, Zhang Ziqiong, Lei Jianshe, Chen Zhaoxi, Liu Jiajun, Hou Limin, 2026. Seismic Velocity Changes of the 2025 Myanmar M7.9 Earthquake. Earth Science, 51(1): 215-225. doi: 10.3799/dqkx.2025.193

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Lyu Ziqiang, Zhang Ziqiong, Lei Jianshe, Chen Zhaoxi, Liu Jiajun, Hou Limin, 2026. Seismic Velocity Changes of the 2025 Myanmar M7.9 Earthquake. Earth Science, 51(1): 215-225. doi: 10.3799/dqkx.2025.193

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Seismic Velocity Changes of the 2025 Myanmar M7.9 Earthquake

doi: 10.3799/dqkx.2025.193

1.
College of Mining, Liaoning Technical University, Fuxin 123000, China
2.
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), Beijing 100083, China

Received Date: 2025-06-23
Publish Date: 2026-01-25

Abstract

Abstract

Seismic velocity change serves 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 pre-seismic 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 post-seismic healing processes of subsurface structure.
- Myanmar M7.9 earthquake,
- autocorrelation,
- seismic velocity changes,
- Sagaing fault,
- geophysics

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References(43)

References

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Seismic Velocity Changes of the 2025 Myanmar M7.9 Earthquake

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