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Magnetotellurics Study to Identify Subsurface Resistivity Structure in the Eastern Part of Kachchh (Little Rann Area) of Gujarat, India

  • Peush Chaudhary
  • Kapil MohanEmail author
  • B. S. Chaudhary
Article
  • 23 Downloads

Abstract

A magnetotelluric (MT) survey has been conducted in the eastern part of the Kachchh region of Gujarat State (crossing Little Rann) starting from Adesar village in the north to Enjar village in the south, where limited geophysical data is available. The profile has been acquired in the N–S direction having a total length of 52 km with the interstation spacing of 3–4 km. From two-dimensional (2D) inversion of the MT data, four conductive zones are identified. The analysis reveals that the depth of the basement varies from 1.2 km (in the south) to 1.8 km (in the north). The first conductive zone is found at a distance of ~ 3 km in the south of Adesar and is identified at the location of the Kanmer fault [KF; the eastern extension of South Wagad fault (SWF)] and might be the KF. The second conductive zone is found at a distance of ~ 42 km in the south of Adesar and ~ 13 km north of Enjar village and is located at the contact zone of Kachchh and Saurashtra peninsula at the location of the North Kathiawar fault (NKF). It is inferred as the NKF. The third conductive zone (at a distance of ~ 27 km in the south of Adesar) is found between the first and second conductor. This is interpreted as a step fault, formed during the rifting process of Kachchh. The lower crust (below 20 km) is found conductive (~ 120 Ω m) and might indicate the presence of fluid-filled mafic/ultramafic rocks in the lower crust.

Keywords

Magnetotellurics eastern Kachchh north Kathiawar fault Kanmer fault south Wagad fault lower crust conductor 

Notes

Acknowledgements

The authors are thankful to the Director General and Director, ISR for their encouragement and permission to publish this work. Thanks to the Government of Gujarat for providing funds under project no. 3425/60/04 to conduct this research work. The authors are also thankful to the editor and two anonymous reviewers for their constructive comments and helpful suggestions for improving the quality of the work.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Peush Chaudhary
    • 1
  • Kapil Mohan
    • 1
    Email author
  • B. S. Chaudhary
    • 2
  1. 1.Institute of Seismological ResearchGandhinagarIndia
  2. 2.Department of GeophysicsKurukshetra UniversityKurukshetraIndia

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