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Probabilistic seismic hazard analysis of Tripura and Mizoram states

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  • Arjun Sil
  • T. Sitharam
  • Sreevalsa Kolathayar

Abstract

A probabilistic seismic hazard analysis for the states of Tripura and Mizoram in North East India is presented in this paper to evaluate the ground motion at bedrock level. Analyses were performed considering the available earthquake catalogs collected from different sources since 1731–2010 within a distance of 500 km from the political boundaries of the states. Earthquake data were declustered to remove the foreshocks and aftershocks in time and space window and then statistical analysis was carried out for data completeness. Based on seismicity, tectonic features and fault rupture mechanism, this region was divided into six major seismogenic zones and subsequently seismicity parameters (a and b) were calculated using Gutenberg–Richter (G–R) relationship. Faults data were extracted from SEISAT (Seismotectonic atlas of India, Geological Survey of India, New Delhi, 2000 ) published by Geological Survey of India and also from satellite images. The study area was divided into small grids of size 0.05° × 0.05° (approximately 5 km × 5 km), and the hazard parameters (rock level peak horizontal acceleration and spectral accelerations) were calculated at the center of each of these grid cells considering all the seismic sources within a radius of 500 km. Probabilistic seismic hazard analyses were carried out for Tripura and Mizoram states using the predictive ground motion equations given by Atkinson and Boore (Bull Seismol Soc Am 93:1703–1729, 2003 ) and Gupta (Soil Dyn Earthq Eng 30:368–377, 2010 ) for subduction belt. Attenuation relations were validated with the observed PGA values. Results are presented in the form of hazard curve, peak ground acceleration (PGA) and uniform hazard spectra for Agartala and Aizawl city (respective capital cities of Tripura and Mizoram states). Spatial variation of PGA at bedrock level with 2 and 10 % probability of exceedance in 50 years has been presented in the paper. Copyright Springer Science+Business Media Dordrecht 2013

Suggested Citation

  • Arjun Sil & T. Sitharam & Sreevalsa Kolathayar, 2013. "Probabilistic seismic hazard analysis of Tripura and Mizoram states," 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. 68(2), pages 1089-1108, September.
    • Handle: RePEc:spr:nathaz:v:68:y:2013:i:2:p:1089-1108
    DOI: 10.1007/s11069-013-0678-y
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    References listed on IDEAS

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    1. Prakash Kumar & Xiaohui Yuan & M. Ravi Kumar & Rainer Kind & Xueqing Li & R. K. Chadha, 2007. "The rapid drift of the Indian tectonic plate," Nature, Nature, vol. 449(7164), pages 894-897, October.
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    Cited by:

    1. Avik Paul & Suvam Gupta & Sima Ghosh & Deepankar Choudhury, 2020. "Probabilistic assessment and study of earthquake recurrence models for entire Northeast region of 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. 102(1), pages 15-45, May.
    2. Md. Zillur Rahman & Sumi Siddiqua & A. S. M. Maksud Kamal, 2020. "Seismic source modeling and probabilistic seismic hazard analysis for Bangladesh," 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. 103(2), pages 2489-2532, September.
    3. Madan Mohan Rout & Josodhir Das & Kamal, 2018. "Probabilistic seismic hazard for Himalayan region using kernel estimation method (zone-free method)," 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. 93(2), pages 967-985, September.
    4. Ali Kavand & Hamid Alielahi, 2017. "Site-specific probabilistic seismic hazard analysis for northern part of the Qeshm Island, Iran," 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. 88(2), pages 919-946, September.
    5. 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.

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