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dc.contributor.authorBürgi, Paulaen_US
dc.contributor.authorHubbard, Judithen_US
dc.contributor.authorAkhter, Syed Humayunen_US
dc.contributor.authorPeterson, Dana E.en_US
dc.identifier.citationBürgi, P., Hubbard, J., Akhter, S. H. & Peterson, D. E. (2021). Geometry of the décollement below eastern Bangladesh and implications for seismic hazard. Journal of Geophysical Research: Solid Earth, 126(8), e2020JB021519-.
dc.description.abstractEastern Bangladesh sits on the seismically active Chittagong-Myanmar fold and thrust belt (CMFB), a north-trending accretionary wedge on the eastern side of the India-Eurasia collision. Earthquakes on the basal décollement and associated thrusts within the CMFB present a hazard to this densely populated region. In this study, we interpret 28 seismic reflection profiles from both published and unpublished sources to constrain the depth of the basal décollement. To convert profiles from the time domain to the depth domain, we integrate sonic log and seismic stacking velocity data to generate time-velocity relationships for different parts of the CMFB. Our analysis reveals that the décollement is ∼9 km deep in northeast and southeast Bangladesh, but shallows to ∼5 km in east-central Bangladesh. The décollement has an area of 7.25 × 104 km2 (∼150 × 450 km), making it capable of an Mw 8.5 earthquake. However, the warped geometry of this fault might act as a rupture barrier were a large earthquake to occur on the décollement. Our combined velocity and fault model lay the groundwork for future studies to address seismic segmentation, ground shaking, and rupture modeling in the CMFB. Finally, we use our compiled data set to analyze the evolution of fold kinematics in the CMFB. We observe that folding style and failure mode varies, from mainly ductile deformation in the foreland to mainly brittle in the hinterland. The dual-failure modes within the CMFB support the hypothesis that a region with ductile deformation may still be capable of seismic behavior.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofJournal of Geophysical Research: Solid Earthen_US
dc.rights© 2021. The Authors.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.en_US
dc.titleGeometry of the décollement below eastern Bangladesh and implications for seismic hazarden_US
dc.typeJournal Articleen
dc.contributor.schoolAsian School of the Environmenten_US
dc.description.versionPublished versionen_US
dc.subject.keywordsBengal Basinen_US
dc.subject.keywordsCenozoic Sedimentsen_US
dc.description.acknowledgementThis research was supported by the National Research Foundation Singapore under its Singapore NRF Fellowship scheme (NRF award NRF-NRFF2013-06), by the Earth Observato-ry of Singapore (EOS), by the Singapore Ministry of Education (MOE) under the Research Centers of Excellence initia-tive, and by a Nanyang Technological University Startup grant. This is EOS contribution number 255.en_US
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