Tectonic geomorphology and seismic hazard of the east boundary thrust in northern segment of the Sunda–Andaman subduction zone

Gulam Rasool Bhat (), Sankaran Balaji () and Maqbool Yousuf ()
Additional contact information
Gulam Rasool Bhat: Pondicherry University, Port Blair Campus
Sankaran Balaji: Pondicherry University, Port Blair Campus
Maqbool Yousuf: National Institute of Technology

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 116, issue 1, No 17, 423 pages

Abstract: Abstract The East Boundary Thrust (EBT) is a ~ 500 km long linear to curvilinear deformation zone that accommodates the bulk of present crustal deformation along the Sunda–Andaman plate edge convergent margin. EBT is the main active tectonic structure responsible for accretionary prism formation in the outerarc ridge of the Andaman and Nicobar subduction zone. The EBT marks the up dip expression of subduction megathrust progressing toward the Andaman trench in the form of actively accreting the frontal prism and deforming the trench sediment sequences above the detachment. We conducted paleoseismic trench investigations of the Jarawa Thrust (JT) (northern 300 km segment of EBT) at two specific sites between Ferrargunj in the south and the Radhanagar in the north Andaman. Structural and stratigraphic relationships exposed in a trench excavated across the 6 m high scarp at Ferrargunj show the scarp to be the result of single earthquake. Dating of sediment offset by the fault with optical luminescence indicates that the displacement occurred between 2160 ± 300 BP and 400 ± 50 BP. Complex structural deformation is observed in the trench excavated across 10 m high scarp at Radhanagar similarly indicates that the scarp is due to single earthquake. The present findings are helpful for seismic hazard evaluation of the Andaman and Nicobar region, where greater slip deficit and no great earthquake (M ≥ 8) have been accounted so far which suggests that the region is potential for earthquakes larger than the observed one historically.

Keywords: Andaman trench; Jarawa thrust; Tectonic scarps; Paleoseismology; Landscape evolution (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://link.springer.com/10.1007/s11069-022-05680-6 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:nathaz:v:116:y:2023:i:1:d:10.1007_s11069-022-05680-6

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/11069

DOI: 10.1007/s11069-022-05680-6

Access Statistics for this article

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards is currently edited by Thomas Glade, Tad S. Murty and Vladimír Schenk

More articles in Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards from Springer, International Society for the Prevention and Mitigation of Natural Hazards
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().