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Mentawai fault zone off Sumatra; a new key to the geodynamics of western Indonesia

M. Diament, H. Harjono, K. Karta, C. Deplus, D. Dahrin, M. T. Zen, M. Gerard, O. Lassal, A. Martin and J. Malod
Mentawai fault zone off Sumatra; a new key to the geodynamics of western Indonesia
Geology (Boulder) (March 1992) 20 (3): 259-262


The geodynamic evolution of the western part of the Sunda arc is controlled by the change from frontal subduction of the Indo-Australian plate along Java to oblique subduction along Sumatra. This obliquity gives rise to the Sumatra fault zone that links the accretionary zone of the Andaman Sea to the Sunda Strait. Previous studies have shown a decrease of displacement rate of the movement along the fault zone from north to south. Consequently, it has been proposed that the area between the subduction zone and the fault zone-i.e., the Sumatra sliver platelet-was deformed. An oceanographic cruise on the Indonesian ship R/V Baruna Jaya III was designed to study this area. Seismic reflection data reveal the existence of a major strike-slip fault, parallel to the Sumatra fault zone, that we called the Mentawai fault zone, located in the fore-arc area just east of the Mentawai Islands; it is at least 600 km long. Thus, the Sumatra sliver plate appears to be composed of several strips that move toward the northwest to accommodate the oblique subduction.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 20
Serial Issue: 3
Title: Mentawai fault zone off Sumatra; a new key to the geodynamics of western Indonesia
Affiliation: Inst. Phys. Globe Paris, Paris, France
Pages: 259-262
Published: 199203
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 23
Accession Number: 1992-012969
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
S06°00'00" - N05°45'00", E95°04'60" - E106°10'00"
S11°00'00" - N06°00'00", E95°00'00" - E128°00'00"
Secondary Affiliation: Puslitbang Geoteknol., IDN, IndonesiaLembaga Minyak dan Gas, IDN, IndonesiaUniv. Paris-Sud, FRA, FranceUniv. Pierre et Marie Curie, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1992
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