东喀尔巴阡山脉弯曲处地震波速度变化与中等地震发生的相关性(Vrancea)

IF 1.3 Q3 ACOUSTICS Acoustics (Basel, Switzerland) Pub Date : 2022-11-01 DOI:10.3390/acoustics4040057
A. Plăcintă, F. Borleanu, I. Moldovan, Alina Coman
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引用次数: 1

摘要

地震速度是一种地球物理性质,在表征断层周围的动态过程和应力状态方面发挥着关键作用,为构造机制的变化提供了有价值的信息。地壳中的应力是可能发生大地震的重要指标,而地震速度随时间的变化可以更清楚地了解该地区正在发生的构造过程。在地壳中,速度在地震之前、期间和之后通过与断层变形、孔隙压力、应力变化和恢复过程有关的几种机制而变化。在这项研究中,我们研究了地震速度(Vp/Vs)随时间的变化与Vrancea地区中等规模地壳和中等深度地震的发生之间的可能相关性。我们的研究结果表明,中等深度地震的Vp/Vs没有显著变化,而地壳事件在主震前降低了地震活动,没有高Vp/Vss异常。我们的结果指出了关键方面,这些分析应该实时进行,以不断探索地震速度变化所指出的任何异常模式。Vp/Vs及其标准误差也可用于描述影响该地区构造演化的地震活动模式。
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Correlation between Seismic Waves Velocity Changes and the Occurrence of Moderate Earthquakes at the Bending of the Eastern Carpathians (Vrancea)
Seismic velocity is the geophysical property that has a key role in characterizing dynamic processes and the state of the stress around the faults, providing valuable information regarding the change in the tectonic regime. The stress in the crust is an important indicator of the possible occurrence of a major earthquake, and the variation of seismic velocities, in time, can provide a clearer picture on the tectonic processes taking place in the region. In the crust, velocities change before, during, and after earthquakes through several mechanisms related to fault deformations, pore pressure, stress changes, and recovery processes. In this study, we investigate the possible correlation between the changes of seismic velocities (Vp/Vs) in time and the occurrence of moderate size crustal and intermediate depth earthquakes from the Vrancea region. Our findings show that there are no significant variations in Vp/Vs for the intermediate depth earthquakes, while crustal events have decreased seismic activity prior to the main earthquake and no high Vp/Vs anomalies. Our results indicate key aspects, and such analyses should be carried out in real-time to continuously explore any unusual pattern pointed out by the seismic velocity changes. Vp/Vs and their standard errors can also be used to describe seismic activity patterns that shape the tectonic evolution of the area.
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CiteScore
3.70
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0.00%
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0
审稿时长
11 weeks
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