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“...1970) spectrum to estimate various source parameters. Both horizontal component (North-South and East-West) are utilized to estimate the source parameters of 25 April 2015 Mw = 7.8 Nepal earthquake and its aftershocks. The best-fit theoretical spectrum provides final values of source parameters, i.e., stress drop, seismic moment, and source radius as 48.7 bars, 5.96 X 1027 dyne cm and 37.75 km, respectively, for the 25 April 2015
Kl Sandeep
sandeepfgp @bhu.ac.in
1 Wadia Institute of Himalayan Geology, Dehradun, India
2 Indian Institute of Technology, Roorkee, Uttarakhand, India
3 Banaras Hindu University, Varanasi, Uttar Pradesh, India
Springer...”
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“...1007
Table 2 Qp(f) relation at Kathmandu station obtained by using inversion of strong motion data
Station Location Component Obtained Final Q^f) relation obtained from NS to EW Q^(f)
(degree) Lat. Long. Qp(f) relation values
Kathmandu 27.71 85.32 NS 66 f°'60 EW 70 f°57 68 f°58
at Kathmandu site is operated by the United States Geological Survey (USGS) and having sampling rate of 200 Hz. The location of earthquakes and recording station utilized in the present work with the elevation and geology is indicated in Fig. 2. The procedure proposed by Boore and Bommer (2005) is implemented for the processing of the records. Different processing steps, i.e., baseline correction, instrument scaling, and frequency filtering are implemented for processing the records. The baseline correction is applied to ensure record initiating from zero, and it is incorporated by subtracting straight line from time series. This subtracting line is the mean value of time series. The mean value is determined from...”
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“..., i.e., stress drop, seismic moment, and source radius. The best-fit Brune’s (1970) theoretical spectrum with the observed corrected spectrum provides these source parameters for the earthquakes of magnitude range 5.3-7.8 used in present work. The obtained values of stress drop, seismic moment, and source radius vary from 9.5-48.7 bars, 1.11 X 1024 to 5.96 X 1027 dyne cm, and 3.7 to 37.75 km, respectively.
Acknowledgements The authors wish to thank the Director, Wadia Institute of Himalayan Geology, Dehradun, for providing permission to publish and supporting this research work. Editor in Chief: T. Glade, Associate Editor, and two anonymous reviewers are highly acknowledged for beneficial suggestions and significant review. The strong motion data obtained from http://earthquake.usgs.gov is thankfully acknowledged.
References
Aki K (1967) Scaling law of seismic spectrum. J Geophys Res 72:1217-1231
Aki K, Richards PG (1980) Quantitative Seismology: Theory and Methods. W. H. Freeman and Co...”
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