Investigating reservoir-triggered seismicity in the Koyna–Warna region through nodal ambient noise tomography

The Koyna–Warna region in southern India is a unique case of dual Reservoir-Triggered Seismicity (RTS), surrounding impoundments on Koyna and Warna rivers. In this study, we perform ambient noise surface wave tomography using data from a temporary dense deployment of three-component geophones in ord...

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Vydáno v:Scientific reports Ročník 15; číslo 1; s. 26323 - 14
Hlavní autoři: Ranjan, Pratul, Kumar, Prakash, Mandal, Biswajit, Karuppannan, Periyasamy
Médium: Journal Article
Jazyk:angličtina
Vydáno: London Nature Publishing Group UK 20.07.2025
Nature Publishing Group
Nature Portfolio
Témata:
639/766
704/2151
704/4111
Anisotropy
Dams
Damsites
Earthquakes
Fault lines
Humanities and Social Sciences
Impoundments
multidisciplinary
Reservoirs
Science
Science (multidisciplinary)
Tomography
Velocity
Wave velocity
India
ISSN:2045-2322, 2045-2322
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Shrnutí:The Koyna–Warna region in southern India is a unique case of dual Reservoir-Triggered Seismicity (RTS), surrounding impoundments on Koyna and Warna rivers. In this study, we perform ambient noise surface wave tomography using data from a temporary dense deployment of three-component geophones in order to understand the origin of RTS. To achieve this objective, surface wave dispersion curves from noise cross-correlations in rotated coordinates were used to create group velocity maps in 0.5–5 s periods. The group velocity dispersions from map bins were inverted for shear wave velocity ( ) and radial anisotropy ( ) maps down to 5 km depth. The and till 1 km depth are correlated with topographical features in agreement with the basement depth estimates. Large earthquakes in the region are marked by negative with negative anomaly or anomaly contrast, suggesting shear strength could be an important control on their genesis. A large negative anomaly southwest of the Koyna reservoir is linked with reservoir water migration to greater depths, part of a larger interconnected system of pathways extending across the reservoirs. These results, set decades post reservoir impoundment, can help understand the evolution of RTS around dam sites elsewhere.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-025-12099-z