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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6628
Title: Estimation of the source parameters of the Nepal earthquake from strong motion data
Authors: Joshi A.
Tomer M.
Lal S.
Chopra S.
Singh, Sandeep
Prajapati S.
Sharma, Mukat Lal
Sandeep
Published in: Natural Hazards
Abstract: Kathmandu and its surrounding region were rocked recently by a devastating earthquake on April 25, 2015. This is the largest earthquake that has occurred in this region since the past eight decades. This earthquake was recorded on strong motion stations located about 470–522 km away from its epicenter. Records of accelerographs from these stations have been used to determine the location of this earthquake using hypo71 algorithm given by Lee and Lehr (HYPO71, a computer program for determining hypocenter, magnitude and first motion pattern of local earthquakes. US Geological Survey Open file report, 100, 1975). The recorded accelerograms have been corrected for site effects using site amplification curve obtained from ambient seismic noise recorded at each station. Site effect has been computed using H/V ratio method given by Nakamura (Q Rep RTRI 30(1):25–33, 1989) using ambient noise data. The corrected record is further used to obtain source displacement spectra. The source spectrum obtained from strong motion data is compared with theoretical source spectrum obtained from Brune’s (J Geophys Res 75:4997–5009, 1970) model for the horizontal components. The long-term flat level and corner frequency from source displacement spectra are used to calculate stress drop, source radius and seismic moment of this earthquake. The present study indicates that the Nepal earthquake originated 12.0 km below the epicenter located at 27.93°N, 84.70°E. The source radius, stress drop and seismic moment of this earthquake estimated from source displacement spectra are 44.13 ± 3.85 km, 18.68 ± 5.93 bars and 3.53 ± 0.28 × 1027 dyne cm, respectively. © 2016, Springer Science+Business Media Dordrecht.
Citation: Natural Hazards (2016), 83(2): 867-883
URI: https://doi.org/10.1007/s11069-016-2351-8
http://repository.iitr.ac.in/handle/123456789/6628
Issue Date: 2016
Publisher: Springer Netherlands
Keywords: Himalaya
Site effect
Spectrum
Strong motion
ISSN: 0921030X
Author Scopus IDs: 55682260000
57189256169
57209614174
25521301600
7406400956
24344387900
7403269008
55914925100
Author Affiliations: Joshi, A., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Tomer, M., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Lal, S., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Chopra, S., Ministry of Earth Sciences, New Delhi, India
Singh, S., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Prajapati, S., Ministry of Earth Sciences, New Delhi, India
Sharma, M.L., Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India
Sandeep, Department of Geophysics, Banaras Hindu University, Varanasi, India
Corresponding Author: Tomer, M.; Department of Earth Sciences, Indian Institute of Technology RoorkeeIndia; email: monutomer3@gmail.com
Appears in Collections:Journal Publications [EQ]
Journal Publications [ES]

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