Bansal, Brijesh K. and Sutar, Anup K. and Verma, Mithila (2025) Seismicity and Strain Rate Variation in Northeast India. Journal of the Geological Society of India, 101 (6).
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| Abstract: | The northeastern part of India, characterized by numerous fault zones, is responsible for varied seismic activity, including large, moderate, and small earthquakes. The current study examines strain rate variations in the region to provide insights into its tectonic deformation and seismic hazard potential. The analysis of strain rates derived from the GPS velocity field reveals a complex deformation pattern, encompassing distinct zones of extensional, compressional, and shear deformation. The dilatation strain rate map highlights regions of positive and negative dilation, corresponding to extensional and compressional deformation, respectively, and indicative of normal and thrust faulting environments. The shear strain map identifies zones with high shear strain rates, marking areas prone to strike-slip faulting. High strain rates are observed along major fault zones, such as the Kopili, Dhubri, and Bomdila faults, as well as the Indo-Burma subduction zone. These findings highlight areas of significant deformation and high seismic risk. The Kopili Fault Zone, in particular, exhibits high compressional strain rates, suggesting a likelihood of future ruptures. The occurrence of the M6.4 earthquake in 2021 near the Kopili Fault, with a combination of thrust and strike-slip faulting, supports our hypothesis. Similarly, the high shear strain rates along major fault zones, such as the Dhubri and Bomdila faults, indicate these areas as potential sites for future significant earthquakes with strike-slip faulting mechanism. We recommend continuous monitoring of strain rate variation to enable a more accurate assessment of seismic hazard in the region. |
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| Item Type: | Journal Paper |
| Subjects: | School of Natural and Engineering Sciences > Geology |
| Divisions: | Schools > Natural Sciences and Engineering |
| Date Deposited: | 08 Oct 2025 10:08 |
| Last Modified: | 08 Oct 2025 10:09 |
| Official URL: | https://pubs.geoscienceworld.org/geosocindia/jour-... |
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| Funders: | * |
| Projects: | * |
| DOI: | https://doi.org/10.17491/jgsi/2025/174170 |
| URI: | http://eprints.nias.res.in/id/eprint/2998 |
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