Constraining the Seismic Potentiality Analysis for Andaman Arc System, NE Indian Ocean
Authors
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Map and Cartography Division, Geological Survey of India, Central Headquarters, 29 J L Nehru Road, Kolkata - 700016
Basab Mukhopadhyay -
Department of Applied Physics, University of Technology, Lae, Papua New Guinea
Manoj Mukhopadhyay
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ESSO, Ministry of Earth Sciences (MoES), Lodi Road, New Delhi
Om Prakash Mishra
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Map and Cartography Division, Geological Survey of India, Central Headquarters, 29 J L Nehru Road, Kolkata - 700016
Diptansu Sengupta
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Ex. Geological Survey of India, Central Headquarters, 27 J L Nehru Road, Kolkata - 700 016
Sujit Dasgupta
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Deanship of Scientific Research, King Saud University, Riyadh-11451
Eslam Elawadi
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Map and Cartography Division, Geological Survey of India, Central Headquarters, 29 J L Nehru Road, Kolkata - 700016
Prabir Kumar Mondal
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Map and Cartography Division, Geological Survey of India, Central Headquarters, 29 J L Nehru Road, Kolkata - 700016
Ghanshyam Dharamchand Gonnade
DOI:
https://doi.org/10.1007/s12594-018-0900-3Abstract
Seismic-potential for the Andaman Arc System (AAS) is evaluated using a three-tier approach: (i) the seismic b-values derived using a revised and homogenized earthquake catalog for Mw≥4.7, with uniform Mw, for the period 1964 - 2013 created from ISC Data, (ii) Free-air gravity-anomalies for AAS and their geologic interpretation and (iii) deep crustal structure from seismic reflection surveys and 3D seismic tomography results. Both longterm spatial b-value anomalies for the period 1964-2013 and temporal b-value anomalies for a shorter period (2002 - 2013) have been estimated. The b-value maps are interpreted in terms of the stress regime acting across AAS and stressed asperities inferred along the strike of AAS. Eight distinguishable seismic-zones are identified and their seismic potential is examined by temporal bvalue anomalies in producing moderate to large earthquakes. The latter demonstrates 'low-high' or 'high-low' couplet over years, and that a variation in b-value more than 20% compared to the previous year value is likely to produce an earthquake event with Mw≥6.0. Some support to this interpretation comes from the regional Free-air gravity-anomalies and deep crustal structure interpreted from hypocentral distribution of earthquakes. The high b-values are seemingly associated with magma chambers or low velocity crust; creating asperity zones due to multiple batholithic intrusions at plate boundary. This geologic interpretation is evidenced by 3D P-wave seismic tomography and velocity heterogeneity study for AAS reported by us elsewhere.
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