Abstract
A ~60 km long Veldurti–Kalva–Gani (VKG) fault is one of the identified strike-slip faults extending from Eastern Dharwar Craton (EDC) to Cuddapah basin in South Indian Shield. The recorded recent seismic activity during year 2012–2016 show occurrences of three microseismic events (< Mw 2.0) in the vicinity of this fault. Historically, no major seismic events are recorded near this fault except magnitude of 5.0–5.9 (1843) earthquake at about ~80 km west of this fault near Bellary. In the present study, analysis of available gravity, aeromagnetic and newly acquired ground gravity and magnetic data in the vicinity of the fault has been carried out to understand subsurface characteristics of this VKG fault and nearby structural features related to recent seismic activity. Analysis of aeromagnetic and gravity data shows shallow origin of the fault and earthquakes are associated with the zone of intersection like cross faults/lineaments which are parallel and perpendicular to the VKG fault. The calculated log normalized radially averaged power spectrum of the available gravity and aeromagnetic data shows four average depths h0 (12.7 km), h1 (6 km), h2 (2.0 km) and h3 (0.5 km). These estimated depths are possibly, bottom of the upper crust, thickness of the Cuddapah basin sediments, horizon of the basic sills, flows and the ferruginous quartzites and cumulative stratigraphic thickness of the Tadpatri shales and the Kurnools in the areas, respectively. The jointly inverted 2-D model from the ground gravity and aeromagnetic data along 2.7 km profile across VKG fault shows, faulting between Banganapalli Quartzite and Tadpatri Shales. The estimated average focal depth from the observed microseismic events is around 13 km. It is concluded from the present study that the observed microseismic events in the vicinity of VKG fault are associated with the intersection zones of cross faults/lineaments near the VKG fault and originated at an average depth of 13 km might be bottom of the upper crust. The estimated depths from the present analysis are well corroborated with previous geophysical studies.
Highlights
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Mapping of Veldurti–Kalva–Gani fault through gravity, magnetic and aeromagnetic data which is associated with recent seismic activity.
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Understanding of origin of the seismic activity through spectral analysis.
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Estimation of depth to the basement, upper crust and thickness of Cuddapah basin sediments in the study region.
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Estimation of focal depth from seismological data and corroboration with spectral analysis of gravity and aeromagnetic data.
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Acknowledgements
The authors record their sincere thanks to Dr V M Tiwari, Director of NGRI, for granting permission to publish this paper. Authors are sincerely thankful to Dr Ch Rama Rao for his constant encouragement and guidance. In the course of writing this paper, various persons of the Seismology Division of NGRI unreservedly rendered their help, which is gratefully acknowledged. The authors sincerely thank the Editor and anonymous reviewers for fruitful suggestions that helped to improve the MS. NGRI Library reference no: NGRI/Lib/2019/pub-124.
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KSK: Manuscript writing, field planning, data collection, processing and interpretation, PSS: Ground gravity and magnetic data collection and processing, SPB: Aeromagnetic data analysis, BL: Ground gravity and magnetic data collection, PMD: Topographic data collection, VMLN: Ground gravity data collection, PSR: Seismological data analysis and DS: Manuscript writing and overall supervision.
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Satish Kumar, K., SivaSankar, P., Parveen Begum, S. et al. Appraisal of Veldurti–Kalva–Gani (VKG) fault, Cuddapah Basin, India: Gravity and magnetic approach. J Earth Syst Sci 130, 40 (2021). https://doi.org/10.1007/s12040-020-01519-5
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DOI: https://doi.org/10.1007/s12040-020-01519-5