Abstract
An inexpensive method using natural earthquake data is utilized for determining the sedimentary thickness in Kachchh. The Institute of Seismological Research (ISR) is operating a network of broadband seismographs and strong motion accelerographs in Gujarat. We used data from 13 broadband seismographs and two strong motion accelerographs in the study. The stations are within 5 to 80 km from the epicenters. In this study the S-to-P converted phase, SP, is used. This phase is generated due to large impedance contrast between sediments and basement. This phase is clear in the vertical component. The difference in the travel times of S and SP phases and velocities of P and S waves is used for determining the sedimentary layer thickness. The thickness of sediments beneath each of these 15 stations was determined covering an area of 23,500 sq km.
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Acknowledgments
The study was supported by the Department of Science and Technology/Ministry of Earth Sciences, Government of India. Gujarat Engineering Research Institute (GERI) provided GEON stations data. Appreciation is extended to Dr. Prantik Mandal of NGRI for providing NGRI data and offering valuable suggestions in the present study.
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Chopra, S., Rao, K.M. & Rastogi, B.K. Estimation of Sedimentary Thickness in Kachchh Basin, Gujarat Using SP Converted Phase. Pure Appl. Geophys. 167, 1247–1257 (2010). https://doi.org/10.1007/s00024-009-0022-3
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DOI: https://doi.org/10.1007/s00024-009-0022-3