FAULT PATTERN AND ACTIVE DEFORMATION OF OUTER ARC RIDGE OF NORTHWEST OF SIMEULUE ISLAND, ACEH, INDONESIA
2017
Author
Haryadi Permana (Pusat Penelitian dan Pengembangan Geoteknologi, Lembaga Ilmu Pengetahuan Indonesia, Jl. Cisitu Lama, Bandung), K. Hirata (Pusat Penelitian dan Pengembangan Geoteknologi, Lembaga Ilmu Pengetahuan Indonesia, Jl. Cisitu Lama, Bandung)
Abstract
New bathymetric map of northwest Simeuleu Island area (3° 01’N-4°57’N and 93°16’E-94°08’E) has evidently illustrated fine morphological image of Outer Arc ridge and Aceh Fore Arc. The structural lineament pattern, inferred from the bathymetric map, could define in general elongated major NW-SE thrust fault complex, thrust fold, or bedding trace and N-S, NNE-SSW, WNW-ESE or ENE-WSW and E-W structural lineament trend. High intensity deformation processes related to high degree obliquity subducted plate was represented by rough and sigmoidal morphological shape, landward and steep to very steep dip angle of bedding plan. Rough morphology, V to U shape valley, dissected ridge and circular shape of landslide trace are common morphology features of active deformation zone. In the near future, high resolution marine seismic will be planned across this area to capture and confirm the subsurface structure configuration and fault movement.
Keyword: bathymetric map, Outer Arc ridge, thrust fault, thrust fold, bedding trace, sigmoidal morphological, V to U shape valley,and landslide.
DOI
Journal
Bulletin of the Marine Geology
Source
DOAJ