Evaluation and implications of seismic events in Garhwal-Kumaun region of Himalaya |
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Authors: | Ajay Paul |
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Institution: | (1) Department of Safety Systems Construction Engineering, Faculty of Engineering, Kagawa University, 2217-20, Hayashi-cho, Takamatsu City 761-0396, Japan;(2) Department of Geology, Tribhuvan University, Tri-Chandra Multiple Campus, Ghantaghar, Kathmandu, Nepal;(3) Department of Civil and Environmental Engineering, Graduate School of Science and Engineering, Ehime University, Bunkyo-cho 3, Matsuyama 790-8577, Japan;(4) Kankyo Chishitsu Co. Ltd., Kaizuka, 1-4-5-203, Kawasaki-ku, Kawasaki City Kanagawa, 210-0014, Japan |
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Abstract: | The Garhwal-Kumaun region continues to accumulate the built-up of strain energy like the other regions of the Himalaya. But
this sector unlike the other sectors is yet to release this accumulated strain energy which can be in the form of great earthquake.
The region has sufficient strain energy to generate earthquake of M>8. The analysis of seven hundred ten local events recorded
by ten station broad band network between August’07 to February’10 shows that most of the seismic events recorded in this
region continue to occur from shallow depths (< 25 km). The evaluation of source parameters from p-wave spectral analysis
indicates that the events have low stress drop values. The region continues to release energy in the form of smaller magnitude
earthquakes. The epicentral location map indicates that Munsiari Thrust, which is located south of the Main Central Thrust
is more active. |
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