Ocean coast effect on magnetotelluric data: a case study from Kachchh, India
Pandey, Dhananjai, Sinha, Martin, MacGregor, Lucy and Singh, Satish (2008) Ocean coast effect on magnetotelluric data: a case study from Kachchh, India. Marine Geophysical Researches, 29, (3), 185-193. (doi:10.1007/s11001-008-9057-6).
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Description/Abstract
The effects of the ocean coast on magnetotelluric (MT) data have been studied and results are described in this article. MT soundings from various sites along coastal plains of Kachchh were acquired where volcanic rocks overlie Mesozoic sediments having potential resource prospects. The region of our study lies in the proximity of Gulf of Kachchh and Arabian Sea. This article describes the effects the presence of a conductive body on the acquired MT data. With the help of synthetic MT modelling and induction arrows we demonstrate the influence of shallow conductive body on the MT data. The modelling results when compared to the field observations show that much of the high frequencies are unaffected by the coast, however low frequencies of the data do seem to be distorted by onshore–offshore resistivity contrasts. The least affect on high frequencies can be attributed to very shallow water depth as well as to the fact that the onshore–offshore resistivity contrasts are not large enough to influence the high frequency data badly. The results presented here report for the first time the effect of the coast on the analysis on MT data from Kachchh. Due to several academic as well as industrial onshore–offshore MT experiments presently being carried out to explore its hydrocarbon potential, our results have an important bearing on designing and acquisition of future MT surveys in this region.
| Item Type: | Article |
|---|---|
| ISSNs: | 0025-3235 (print) 1573-0581 (electronic) |
| Keywords: | magnetotelluric, deccan traps, coast effect |
| Subjects: | G Geography. Anthropology. Recreation > GC Oceanography Q Science > QE Geology |
| Divisions: | University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES) |
| Item ID: | 58278 |
| Date Deposited: | 13 Aug 2008 |
| Last Modified: | 12 Jun 2013 01:12 |
| Contributors: | Pandey, Dhananjai (Author) Sinha, Martin (Author) MacGregor, Lucy (Author) Singh, Satish (Author) |
| Date: | September 2008 |
| Status: | Published |
| Contact Email Address: | dyp@noc.soton.ac.uk |
| URI: | http://eprints.soton.ac.uk/id/eprint/58278 |
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