Magnetotelluric study of an intraplate seismic zone in the Palghar region of the Deccan Volcanic Province, India

The Deccan Volcanic Province in the western part of the peninsular India is an intraplate region, which experiences moderate seismic activity, the most recent one being a swarm-type activity in the Palghar region, about 120 km north of Mumbai, that started in November 2018 and has produced a few thousand micro-earthquakes and a 4.3 magnitude earthquake since then. Broadband MT data were acquired at 18 sites with average station spacing of 2 km. Impedance tensors were analyzed for distortion and dimensionality, decomposed into TE- and TM-mode, and inverted by a 2D inversion algorithm. The geoelectric structure yields an assemblage of highly resistive and moderately conductive blocks in the uppermost crust resting on a major listric-type fault, that possibly reaches the surface at the West Coast Fault from a depth of about 15 km beneath the Panvel Cexure zone. In conjunction with the regional Bouguer gravity anomaly and the seismicity distribution, we infer that the upper crustal heterogeneities coupled with the basement fault and low rheological strength of the fractured upper-to-middle crust might be leading to triggering of the seismicity in the region.

Figure Caption: Left: Study area; Right: Subsurface conductivity structure across seismic zone

 

Citation: G Pavankumar, N N Chakravarthi, M Demudu Babu and Manglik A; 2020, Magnetotelluric study of an intraplate seismic zone in the Palghar region of the Deccan Volcanic Province, India; J. Earth Syst. Sci. (2020) 129:133, https://doi.org/10.1007/s12040-020-01398-w external link