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This study aims to provide an updated assessment of seismic hazards in the Andaman-Nicobar and Sumatra regions, focusing on recent earthquakes and their impact.

August 9, 2026Scientific ReportsOpen Access

Updated comprehensive probabilistic seismic hazard analysis of the Andaman-Nicobar and Sumatra regions

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SSSaurabh SainiIndian Institute of Technology Kharagpur MSMohd ShahabuddinIndian Institute of Technology Kharagpur PRParesh Nath Singha RoyIndian Institute of Technology Kharagpur

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Implication

Updated probabilistic seismic hazard assessment quantifies risks in Andaman-Nicobar and Sumatra regions, indicating high seismic hazards for infrastructure planning.

Key Points

This study aims to provide an updated assessment of seismic hazards in the Andaman-Nicobar and Sumatra regions, focusing on recent earthquakes and their impact.
Utilized a homogenized earthquake catalog from 1881–2025 with 37,660 events.
Estimated seismicity parameters using region-specific completeness values derived from frequency-magnitude distribution analysis.
Incorporated a 72-branch logic tree framework to account for epistemic uncertainties.
Hazard maps indicate peak ground acceleration values of 0.25–0.40 g for 10% probability of exceedance in 50 years.
Values increase to 0.40–0.70 g for 2% probability of exceedance along the Sunda megathrust and Nicobar segment.
Significant seismic hazards are highlighted due to both megathrust and intraplate sources.

Cite This Study

Saini et al. (2026) studied this question.

synapsesocial.com/papers/6a782cfa2e1896536c83fbe9 https://doi.org/10.1038/s41598-026-64505-9

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Implication

Updated probabilistic seismic hazard assessment quantifies risks in Andaman-Nicobar and Sumatra regions, indicating high seismic hazards for infrastructure planning.

Updated comprehensive probabilistic seismic hazard analysis of the Andaman-Nicobar and Sumatra regions

Discussion

Member takes

Implication

Key Points

Cite This Study

Updated comprehensive probabilistic seismic hazard analysis of the Andaman-Nicobar and Sumatra regions

Discussion

Member takes

Implication

Key Points

Cite This Study

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