A study of Palnadu earthquake sequence in the Cuddapah basin and its tectonic implications

Srinagesh, D.; Sunilkumar, T. C.; Naresh, B.; Vitthal, S; Singh, Dinesh; Singh, Ravi P.; Naidu, M. S.; Suresh, G.; Raju, P. V. Sunder; Kumar, Vikas; Mandal, Prantik; Sarma, A. N. S.

doi:10.1007/s12040-021-01552-y

Cited by 3 publications

(9 citation statements)

References 30 publications

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“…It is inferred that this lower crustal intraplate earthquake with a large stress drop of 3.9 MPa might have been generated due to the sudden movement on an almost vertical fault due to high pore-fluid pressure caused by the presence of CO 2 -rich mantle fluids. Srinagesh et al (2021) analyzed a sequence of about 965 earthquakes in the magnitude range of 0.1-4.6. The main shock of moderate-sized earthquake (2020-01-26, M L ∼ 4.6) is located in the Palnadu sub-basin of the Cuddapah basin.…”

Section: Intraplate Regionsmentioning

confidence: 99%

INSA National Report on Seismological Research in India: 2019 – 2022

Manglik

2023

Preprint

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The Indian National Science Academy (INSA), the National Adhering body representing India in the International Union of Geodesy and Geophysics (IUGG), submits a National Report to the IUGG during its General Assembly, held every four years. The present chapter is a compilation for the International Association of Seismology and Physics of the Earth's Interior (IASPEI), one of the eight Associations of the IUGG, encompassing the scientific activities carried out in the country during 2019-2022, in the field of seismology. The chapter is arranged to categorize the contributions under internal structure of the Indian lithosphere and sub-lithospheric mantle, crust and upper mantle deformation, seismic attenuation, seismic hazards, triggered seismicity, environmental seismology, paleoseismology and seismological networks. In addition, the chapter includes activities related to societal projects and outreach programs. It is not an exhaustive review of the entire Indian contribution to seismology and allied fields during this period but a window to the topics covered within the framework of IASPEI.During the reporting period, researchers from several Indian R&D and Academic Institutions continued adding new results on the crustal and upper mantle structure of the Indian shield, both at regional and geological province scale. The Himalaya has been a major focus of seismological research for many Institutes who operated broadband seismological networks from Kashmir to Arunachal along the Himalayan arc. The data from these networks have facilitated in enhancing our understanding of the structure of the Main Himalayan Thrust, crustal and upper mantle structure as well as the dip of the underthrusting Indian plate, seismicity monitoring, and estimation of attenuation. Some of these networks also include accelerographs for strong ground motion studies. A few studies also focused on mapping of the mantle transition zone beneath the Indian Ocean Geoid Low. The studies on anthropogenic seismicity added near-field investigations in the Koyna -Warna region through borehole seismology. Organization of the Joint Scientific Assembly of IAGA and IASPEI during 21-27 August 2021 (JSA-2021) was a major event during this period related to the IUGG activities. Originally, the event was planned to be hosted at Hyderabad, India, but due to the COVID-19 pandemic it was organized in virtual mode. Initiatives have been taken to nucleate the field of environmental seismology in the country.

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Section: Intraplate Regionsmentioning

confidence: 99%

INSA National Report on Seismological Research in India: 2019 – 2022

Manglik

2023

Preprint

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“…Preliminary locations of these earthquakes were obtained using the SEISAN software (Ottemöller et al, 2018). A velocity model (Srinagesh et al, 2021) based on the results of modeling the data from a nearby deep seismic profile (Reddy et al, 2004) is used for this purpose. We performed a velocity sensitivity analysis using the velocity models of Kaila and Tewari (1985), Reddy et al (2004), andSrinagesh et al (2021), which shows that the chosen model is slightly better than the other models (Figure S2 in Supporting Information S1).…”

Section: Earthquake Monitoring and Analysis Of The Seismological Datamentioning

confidence: 99%

“…We confirm that the shallow focal depth of these earthquakes is not an artifact of the velocity model, because even for other considered velocity models and a model which does not have any shallow layer (Figure S5 in Supporting Information S1), the focal depth of these earthquakes did not change significantly. Srinagesh et al (2021) reported that the focal mechanism of the mainshock (Figure S6 in Supporting Information S1) is predominantly strike slip (NP1 strike, dip and rake as 270°, 65°, 180°, and NP2 strike dip and rake as 360°, 90°, 25°). Such a mechanism appears unusual and inconsistent with the regional stress arising from the Indian plate motion.…”

Section: Earthquake Monitoring and Analysis Of The Seismological Datamentioning

confidence: 99%

“…A velocity model (Srinagesh et al, 2021) based on the results of modeling the data from a nearby deep seismic profile (Reddy et al, 2004) is used for this purpose. We performed a velocity sensitivity analysis using the velocity models of Kaila and Tewari (1985), Reddy et al (2004), andSrinagesh et al (2021), which shows that the chosen model is slightly better than the other models (Figure S2 in Supporting Information S1). We refined the hypocenter locations using the probabilistic location program NonLinLoc (Lomax et al, 2000) which considers errors due to various factors (e.g., error in phase pickups, noise, uncertainty in the velocity model) and translates them into location uncertainties.…”

Section: Earthquake Monitoring and Analysis Of The Seismological Datamentioning

confidence: 99%

“…The grid node separation is 250 m in all directions. Travel-times and ray take-off angles from each node to another are computed using the velocity model of Srinagesh et al (2021). The solution space is effi- ciently searched by the Oct-tree Importance sampling algorithm (Lomax et al, 2000).…”

Section: Earthquake Monitoring and Analysis Of The Seismological Datamentioning

confidence: 99%

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Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India

Gahalaut,

Paul,

Sunilkumar

et al. 2023

Earth and Space Science

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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.

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Earthquake monitoring in India: a status report (2019–2023)

Sharma

2024

Proc.Indian Natl. Sci. Acad.

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A study of Palnadu earthquake sequence in the Cuddapah basin and its tectonic implications

Cited by 3 publications

References 30 publications

INSA National Report on Seismological Research in India: 2019 – 2022

INSA National Report on Seismological Research in India: 2019 – 2022

Earthquakes Induced by Rapid Loading of Faults During Pulichintala Reservoir Impoundment in the Stable Continental Region of India

Earthquake monitoring in India: a status report (2019–2023)

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