A Study of Deep Geoelectric Structure and Its Relation to Seismotectonics and Economic Development of Saurashtra Region, Western India

One of the significant sections of the Indian continental lithosphere with fascinating geophysical anomalies, tectonothermal evolution since the Mesozoic times, is the Saurashtra Peninsula and its neighbouring regions covered by Deccan Traps (DT). For the understanding of seismo-tectonics and economic development of the region, knowledge of the deep structure beneath these formations is essential. After the occurrence of a major earthquake (7.9 Mw) north of Saurashtra, the Bhuj earthquake in 2001, this region gained significance. It is also noted that many earthquake swarms restricted to small regions have also been encountered in the Saurashtra region. Magnetotelluric outcomes of the deep crustal structure along five NS-oriented traverses are presented in our study. Halvad-Rohisa (HR), Sapar-Iswaria (SI), Mota Dahinsara-Bamagadh (MB), JodiyaJamkhandorna (JJ) and Vav Beraja-Devda (VD) are the five crossing routes. More confidence in the findings that are derived. In areas ranging from 20 km to around 40 km, the 2-D geoelectric segment has delineated buried sediments below the basalt and also has an irregular high conductivity structure. An anomalous high conductive structure derived from MT data with extreme localised seismic activity from the spatial correlation is an important observation. The results of magnetotelluric studies along with other geophysical results are described in the present report. In addition, the outcome of the current study has significant consequences for the region’s economic growth. Large infrastructure near the Chotila region of Gujarat is suggested and large quantities of crude hydrocarbons can be stored in deep buried sediments by drilling 1-1.5 km and can be recovered if necessary.

Author (s) Details

D. N. Murthy
CSIR-National Geophysical Research Institute, Hyderabad, India.

CSIR-National Geophysical Research Institute, Hyderabad, India

K. Kanmani
CSD and Civil Engineering Department, BS Abdur Rahaman Crescent Institute of Science and Technology, Chennai, India.

Dr.T. Harinarayana
CSIR-National Geophysical Research Institute, Hyderabad, India (Rtd) and SDG, BS Abdur Rahaman Crescent Institute of Science and Technology, Chennai, India.

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