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A deterministic approach for preparation of seismic hazard maps in North East India

Author

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  • A. Joshi
  • Kapil Mohan
  • R. Patel

Abstract

A method of seismic zonation based on deterministic modeling of rupture plane is presented in this work. This method is based on the modeling of finite rupture plane along identified lineaments in the region using the semi-empirical technique, of Midorikawa [(1993) Tectonophysics 218:287–295]. The modeling procedure follows ω 2 scaling law, directivity effects, and other strong motion parameters. The technique of zonation is applied for technoeconomically important NE part of Brahmaputra valley that falls in the seismic gap region of Himalaya. Zonation map prepared for Brahmaputra valley for earthquakes of magnitude M > 6.0 show that approximately 90,000 km 2 area fall in the highly hazardous zone IV, which covers region that can have peak ground accelerations of order more than 250 cm/s 2 . The zone IV covers the Tezu, Tinsukia, Dibrugarh, Ziro, North Lakhimpur, Itanagar, Sibsagar, Jorhat, Golaghat, Wokha, Senapati, Imphal, and Kohima regions. The Pasighat, Daring, Basar, and Seppa region belong to zone III with peak ground accelerations of the order 200–250 cm/s 2 . The seismic zonation map obtained from deterministic modeling of the rupture is consistent with the historical seismicity map and it has been found that the epicenter of many moderate and major earthquakes fall in the identified zones. Copyright Springer Science+Business Media, Inc. 2007

Suggested Citation

  • A. Joshi & Kapil Mohan & R. Patel, 2007. "A deterministic approach for preparation of seismic hazard maps in North East India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 43(1), pages 129-146, October.
    • Handle: RePEc:spr:nathaz:v:43:y:2007:i:1:p:129-146
    DOI: 10.1007/s11069-007-9112-7
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    Citations

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    Cited by:

    1. K. Mohan & A. Joshi, 2012. "Role of attenuation relationship in shaping the seismic hazard," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 60(2), pages 649-670, January.
    2. A. Joshi & K. Mohan, 2010. "Expected peak ground acceleration in Uttarakhand Himalaya, India region from a deterministic hazard model," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 52(2), pages 299-317, February.
    3. Sreevalsa Kolathayar, 2021. "Recent seismicity in Delhi and population exposure to seismic hazard," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 109(3), pages 2621-2648, December.
    4. Kapil Mohan & A. Joshi, 2013. "Simulation of strong ground motion due to great earthquake in the central seismic gap region of Uttarakhand Himalaya," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 69(3), pages 1733-1749, December.

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