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Probabilistic assessment of earthquake hazard in the Andaman–Nicobar–Sumatra region

Author

Listed:
  • Minakshi Mishra

    (CGI
    Indian Institute of Technology)

  • Abhishek

    (Kurukshetra University)

  • R. B. S. Yadav

    (Kurukshetra University)

  • Manisha Sandhu

    (Kurukshetra University)

Abstract

The Andaman–Nicobar–Sumatra (ANS) region is a very hazardous area on the globe, which has witnessed a megathrust earthquake of Mw 9.2 on 26 December 2004 and several dozen large earthquakes in the past. We estimate earthquake hazard parameters (i.e. seismic a- and b-values, maximum expected earthquake magnitudes, mean return periods and probabilities of earthquakes) in 11 shallow and 4 intermediate to deep depth seismogenic zones of the ANS region using a uniform and comprehensive earthquake data for the duration 1906–2018. The earthquake hazard scenarios for all seismogenic zones are calculated using the Gutenberg–Richter frequency–magnitude relation and the Gumbel’s extreme value theory. The low b-values ( 0.90) for the earthquake of Mw 7.0 in the next 50 years and 100 years are observed in shallow zones 4–11 (the Sumatra and Nicobar Islands), while only intermediate to deep zone 4 (Sumatra) shows high probabilities. The low return periods ( 0.90) for the earthquake of Mw 7.0 are observed in shallow zones 5–11 (the Nicobar Islands and Sumatra regions), which suggest high earthquake hazard in these zones. The spatial variations of earthquake hazard parameters from one zone to another suggest a large grade of crustal heterogeneity and seismotectonic complexity present in this area.

Suggested Citation

  • Minakshi Mishra & Abhishek & R. B. S. Yadav & Manisha Sandhu, 2021. "Probabilistic assessment of earthquake hazard in the Andaman–Nicobar–Sumatra region," 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. 105(1), pages 313-338, January.
  • Handle: RePEc:spr:nathaz:v:105:y:2021:i:1:d:10.1007_s11069-020-04311-2
    DOI: 10.1007/s11069-020-04311-2
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    References listed on IDEAS

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