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首页> 外文期刊>Journal of Asian earth sciences >Coseismic responses and the mechanism behind M_w 5.1 earthquake of March 14, 2005 in the Koyna-Warna region, India
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Coseismic responses and the mechanism behind M_w 5.1 earthquake of March 14, 2005 in the Koyna-Warna region, India

机译：2005年3月14日印度科伊纳-瓦尔纳地区M_w 5.1地震的震源响应和机制

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摘要

An earthquake of M_w 5.1 occurred on March 14, 2005, in the seismically active Koyna-Warna region in western India, the site known for the largest reservoir triggered seismicity (RTS) in the world. For more than four decades, earthquakes with M ≥ 4.0 have occurred in this region at regular intervals. Impoundment of reservoirs and changes in lake levels can trigger earthquakes by two processes of stress modifications, namely direct loading effect of the reservoir and diffusion through various faults and fractures. In this paper we analysed the reservoir water level data at Koyna and Warna reservoirs prior to the occurrence of the March 14, 2005 earthquake, to explain the dominant mechanism behind its occurrence and its correlation with the observed coseismic changes. We conclude that the diffusion process, not the reservoir load effect, is the dominating mechanism triggering earthquakes in the region. The coseismic changes in deep well water levels sensitive to earth tides are found to be to the order of 1-12 cm.
机译：2005年3月14日，在印度西部地震活跃的科伊纳-瓦尔纳地区发生了M_w 5.1级地震，该地区以世界上最大的水库触发地震（RTS）闻名。四十多年来，该地区定期发生M≥4.0地震。水库蓄水和湖泊水位变化可通过两个应力修正过程触发地震，即水库的直接荷载作用和通过各种断层和裂缝的扩散。在本文中，我们分析了2005年3月14日地震发生前科伊纳和瓦尔纳水库的水位数据，以解释其背后的主导机制及其与观测到的同震变化的相关性。我们得出的结论是，扩散过程而不是储层负荷效应是触发该地区地震的主要机制。发现对潮汐敏感的深井水位的同震变化约为1-12厘米。

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