Crustal deformation in Volcanic covered area as inferred from magnetotelluric studies: An example from India

Abstract

We present 2D and 3D inversion results using data from 22 broadband magnetotelluric sites in Saurashtra peninsula, India. The configuration of the Deccan basalt and sub-basaltic Mesozoic sediments is imaged using 2D inversion by implementing the appropriate regularization operator and the model is analogous to the 3D model. The regional fault systems are imaged within the highly resistive granitic crustal segment. The trend of these deep extending faults, seismicity and dyke patterns have similarities with those in Narmada – Son Lineament (NSL) region and it hints the possible extension of NSL to Saurashtra, in which both regions are now separated by Gulf of Cambay. Imaged fault systems have played a vital role in the magmatic transport to the surface during the Deccan volcanic event, and it has resulted in the modification of the crustal segments.