Crustal Extension in the Sunda Strait Indonesia from GPS observation
Abstract
Sunda Strait which lies between the two large islands of Java and Sumatra is a transition between normal subduction in front of Java and oblique subduction with sliver plates and strike-slip faults accommodating the lateral component of the oblique subduction. The northwest motion of the Sumatra forearc sliver plate induces extension in the fore arc of Sunda Strait. This transition zone is characterized by the evolution of graben structures, strike slip fault and crustal extension. This research uses campaign and continuous GPS observation from South of Lampung, Sebuku Island and Banten from 2009-2012, indicate that present-day deformation of Sunda Strait is controlled by extension in the southern Strait of Sunda, compression in the north, strike slip motion of Sumatra fault and and the coupling between Indo-Australian plate and Indonesia that pushing Sunda strait to the north. The estimated dextral slip-rate of Sumatran fault in the Sunda strait is 2.5cm/year. Keywords: GPS Observation, crustal extension, Sunda strait
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2012
- Bibcode:
- 2012AGUFM.G43B0924M
- Keywords:
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- 1209 GEODESY AND GRAVITY / Tectonic deformation;
- 8123 TECTONOPHYSICS / Dynamics: seismotectonics