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<p>Reservoir triggered seismicity (RTS) have been documented at about 700 locations worldwide, with the Koyna-Warna region in Western India hosted the largest triggered earthquake of magnitude 6.3. Despite substantial work has been done to understand the genesis of triggered earthquakes around Koyna-Warna reservoirs, most of the research has been limited to the immediate areas of the reservoirs. In this study, we expand the investigation to encompass a broader area, aiming to explore the impact of geological heterogeneity and groundwater storage anomalies derived from GRACE satellite data on earthquake occurrence in the region. Utilising 30-m resolution digital elevation model, we extracted lineaments and generated lineament density and trend maps. Analysis reveals a total of 927 lineaments spanning 33.73&#xa0;km, with shorter lineaments comprising 70% of the total count. Lineament density ranges from 0 to 1.8&#xa0;km/km<sup>2</sup>, indicating varying degrees of rock fracturing, with densities of 0.6–1.20&#xa0;km/km<sup>2</sup> and 0.4–0.6&#xa0;km/km<sup>2</sup> indicate high and moderate levels. Dominant lineament trends are observed in the N-S, NNW-SSE and WNW-ESE directions. Good correlation between lineament density, and earthquake occurrence is observed which is further validated from groundwater anomaly.</p>

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Geological heterogeneity and hydrological dynamics impact on triggered earthquake genesis in Deccan basaltic terrain of western India

  • 期刊论文

  • 发表日期：

    2025年5月25日

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  • Kondarathi Aruna Kumari,
  • Lagudu Surinaidu,
  • Yedavally Srinu,
  • Kalpna Gahalaut

摘要

Reservoir triggered seismicity (RTS) have been documented at about 700 locations worldwide, with the Koyna-Warna region in Western India hosted the largest triggered earthquake of magnitude 6.3. Despite substantial work has been done to understand the genesis of triggered earthquakes around Koyna-Warna reservoirs, most of the research has been limited to the immediate areas of the reservoirs. In this study, we expand the investigation to encompass a broader area, aiming to explore the impact of geological heterogeneity and groundwater storage anomalies derived from GRACE satellite data on earthquake occurrence in the region. Utilising 30-m resolution digital elevation model, we extracted lineaments and generated lineament density and trend maps. Analysis reveals a total of 927 lineaments spanning 33.73 km, with shorter lineaments comprising 70% of the total count. Lineament density ranges from 0 to 1.8 km/km2, indicating varying degrees of rock fracturing, with densities of 0.6–1.20 km/km2 and 0.4–0.6 km/km2 indicate high and moderate levels. Dominant lineament trends are observed in the N-S, NNW-SSE and WNW-ESE directions. Good correlation between lineament density, and earthquake occurrence is observed which is further validated from groundwater anomaly.