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

On January 26, 2020, a moderate-sized earthquake ( M L ~ 4.6) located in the Palnadu sub-basin of Cuddapah basin was felt both in the states of Telangana and Andhra Pradesh. The earthquakes prior and after the M L 4.6 are located close to the thrust and along the periphery of the backwaters of the P...

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Bibliographic Details
Published in:Journal of Earth System Science 2021-12, Vol.130 (1), p.52, Article 52
Main Authors: Srinagesh, D, Sunilkumar, T C, Naresh, B, Vitthal, S, Singh, Dhiraj K, Singh, Ravi P, Naidu, Mahalaxmi, Suresh, G, Raju, P Solomon, Kumar, V Pavan, Mandal, Prantik, Sarma, A N S
Format: Article
Language:English
Subjects:
Backwaters
Earth and Environmental Science
Earth Sciences
Earthquakes
Fault lines
Focal plane
Plate tectonics
Relocation
Sediments
Seismic activity
Seismology
Sequencing
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Spatial distribution
Tectonics
Thrust
Velocity
Waveforms
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Summary:On January 26, 2020, a moderate-sized earthquake ( M L ~ 4.6) located in the Palnadu sub-basin of Cuddapah basin was felt both in the states of Telangana and Andhra Pradesh. The earthquakes prior and after the M L 4.6 are located close to the thrust and along the periphery of the backwaters of the Pulichintala Reservoir. About 965 earthquakes in the magnitude range of 0.1–4.6 M L have been located by seismological network. The epicentral parameters obtained from double difference technique illuminated a steep seismogenic structure extending up to 8 km depth using a minimum 1-D velocity model. The b -value estimate is 0.82 for a completeness magnitude of M c 1.8 and could be associated with the intraplate event having a longer recurrence time. The focal mechanism solution obtained from waveform inversion reveals a pure double-couple mechanism of a strike-slip motion with a reverse component on a N–S trending focal plane. The spatial distribution of the earthquake sequence and fault plane solution of the main event are close to a thrust which is the most likely source region of the main-shock. Highlights Relocation of the Palnadu earthquake sequence illuminated a steep seismogenic structure extending up to 8 km depth. The estimated lower b-value (0.82) could be associated with the intraplate event having a longer recurrence time. The focal mechanism solution of the main-shock ( M L 4.6) shows a strike-slip motion with a reverse component.
ISSN:2347-4327
0253-4126
0973-774X
DOI:10.1007/s12040-021-01552-y