Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India
Abstract The first stage impoundment of the Pulichintala reservoir in the Proterozoic Cuddapah basin in the southeastern Indian shield began in August 2014. The second stage of impoundment started in 2019 when the height of the dam was increased and the filling of the reservoir was rapid. Soon after...
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| Format: | Article |
| Language: | English |
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American Geophysical Union (AGU)
2023-10-01
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| Series: | Earth and Space Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2023EA002902 |
| _version_ | 1797648026815168512 |
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| author | Kalpna Gahalaut Himangshu Paul T. C. Sunilkumar M. Ravi Kumar V. K. Gahalaut |
| author_facet | Kalpna Gahalaut Himangshu Paul T. C. Sunilkumar M. Ravi Kumar V. K. Gahalaut |
| author_sort | Kalpna Gahalaut |
| collection | DOAJ |
| description | Abstract The first stage impoundment of the Pulichintala reservoir in the Proterozoic Cuddapah basin in the southeastern Indian shield began in August 2014. The second stage of impoundment started in 2019 when the height of the dam was increased and the filling of the reservoir was rapid. Soon after earthquakes started occurring which continued for a few months with a maximum magnitude of ML 4.6 on 25 January 2020. Two distinct clusters within the shallow crust were identified, which follow the faults/shear zones in the region. The estimated focal mechanisms with predominant strike slip motion on steep planes and the derived stress state are consistent with the regional stress and plate motion of the Indian plate. We simulated the influence of reservoir impoundment on the inferred seismogenic faults and found that the stress and pore pressure due to reservoir load indeed promoted failure, thus inducing earthquakes. We ascribe the induced earthquakes to rapid filling, longer and higher retention of high‐water levels during 2019–2020, which caused a stress change of 4–8 kPa. This stress change was at least two orders of magnitude higher than the typical tectonic loading rate in the stable continental region of the Indian Shield. |
| first_indexed | 2024-03-11T15:26:10Z |
| format | Article |
| id | doaj.art-691ebb53d68d446f80aea63250a74ffa |
| institution | Directory Open Access Journal |
| issn | 2333-5084 |
| language | English |
| last_indexed | 2024-03-11T15:26:10Z |
| publishDate | 2023-10-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Earth and Space Science |
| spelling | doaj.art-691ebb53d68d446f80aea63250a74ffa2023-10-27T17:48:33ZengAmerican Geophysical Union (AGU)Earth and Space Science2333-50842023-10-011010n/an/a10.1029/2023EA002902Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of IndiaKalpna Gahalaut0Himangshu Paul1T. C. Sunilkumar2M. Ravi Kumar3V. K. Gahalaut4CSIR‐National Geophysical Research Institute Hyderabad IndiaCSIR‐National Geophysical Research Institute Hyderabad IndiaCSIR‐National Geophysical Research Institute Hyderabad IndiaCSIR‐National Geophysical Research Institute Hyderabad IndiaCSIR‐National Geophysical Research Institute Hyderabad IndiaAbstract The first stage impoundment of the Pulichintala reservoir in the Proterozoic Cuddapah basin in the southeastern Indian shield began in August 2014. The second stage of impoundment started in 2019 when the height of the dam was increased and the filling of the reservoir was rapid. Soon after earthquakes started occurring which continued for a few months with a maximum magnitude of ML 4.6 on 25 January 2020. Two distinct clusters within the shallow crust were identified, which follow the faults/shear zones in the region. The estimated focal mechanisms with predominant strike slip motion on steep planes and the derived stress state are consistent with the regional stress and plate motion of the Indian plate. We simulated the influence of reservoir impoundment on the inferred seismogenic faults and found that the stress and pore pressure due to reservoir load indeed promoted failure, thus inducing earthquakes. We ascribe the induced earthquakes to rapid filling, longer and higher retention of high‐water levels during 2019–2020, which caused a stress change of 4–8 kPa. This stress change was at least two orders of magnitude higher than the typical tectonic loading rate in the stable continental region of the Indian Shield.https://doi.org/10.1029/2023EA002902reservoir induced seismicityPulichintala reservoirIndian shieldstable continental regionporoelastic modelingrapid fault loading |
| spellingShingle | Kalpna Gahalaut Himangshu Paul T. C. Sunilkumar M. Ravi Kumar V. K. Gahalaut Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India Earth and Space Science reservoir induced seismicity Pulichintala reservoir Indian shield stable continental region poroelastic modeling rapid fault loading |
| title | Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India |
| title_full | Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India |
| title_fullStr | Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India |
| title_full_unstemmed | Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India |
| title_short | Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India |
| title_sort | earthquakes induced by rapid loading of faults during pulichintala reservoir impoundment in the stable continental region of india |
| topic | reservoir induced seismicity Pulichintala reservoir Indian shield stable continental region poroelastic modeling rapid fault loading |
| url | https://doi.org/10.1029/2023EA002902 |
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