Print Email Facebook Twitter Microblock rotations and fault coupling in SE Asia triple junction (Sulawesi, Indonesia) from GPS and earthquake slip vector data Title Microblock rotations and fault coupling in SE Asia triple junction (Sulawesi, Indonesia) from GPS and earthquake slip vector data Author Socquet, A. Simons, W.J.F. Vigny, C. McCaffrey, R. Subarya, C. Sarsito, D. Ambrosius, B. Spakman, W. Faculty Aerospace Engineering Department Space Engineering Date 2006-08-31 Abstract The island of Sulawesi, eastern Indonesia, is located within the triple junction of the Australian, Philippine, and Sunda plates and accommodates the convergence of continental fragments with the Sunda margin. We quantify the kinematics of Sulawesi by modeling GPS velocities and earthquake slip vectors as a combination of rigid block rotations and elastic deformation around faults. We find that the deformation can be reasonably described by a small number of rapidly rotating crustal blocks. Relative to the Sunda Plate, the southwestern part of Sulawesi (Makassar Block) rotates anticlockwise at ?1.4°/Myr. The northeastern part of Sulawesi, the Bangai?Sula domain, comprises three blocks: the central North Sula Block moves toward the NNW and rotates clockwise at ?2.5°/Myr, the northeastern Manado Block rotates clockwise at ?3°/Myr about a nearby axis, and East Sulawesi is pinched between the North Sula and Makassar blocks. Along the boundary between the Makassar Block and the Sunda Plate, GPS measurements suggest that the trench accommodates ?15 mm/yr of slip within the Makassar Strait with current elastic strain accumulation. The tectonic boundary between North Sula and Manado blocks is the Gorontalo Fault, moving right laterally at about 11 mm/yr and accumulating elastic strain. The 42 mm/yr relative motion between North Sula and Makassar blocks is accommodated on the Palu?Koro left?lateral strike?slip fault zone. The data also indicate a pull?apart structure in Palu area, where the fault shows a transtensive motion and may have a complex geometry involving several active strands. Sulawesi provides a primary example of how collision can be accommodated by crustal block rotation instead of mountain building. Subject interseismic couplingSE AsiakinematicsGPSelastic model To reference this document use: http://resolver.tudelft.nl/uuid:c89f9e7d-ea2d-4ce6-b74c-1faabad284c2 DOI https://doi.org/10.1029/2005JB003963 Publisher American Geophysical Union ISSN 0148-0227 Source http://europa.agu.org/?view=article&uri=/journals/jb/jb0608/2005JB003963/2005JB003963.xml Source Journal of Geophysical Research, 111, 2006 Part of collection Institutional Repository Document type journal article Rights (c) 2006 The Author(s); American Geophysical Union Files PDF Simons_2006.pdf 2.35 MB Close viewer /islandora/object/uuid:c89f9e7d-ea2d-4ce6-b74c-1faabad284c2/datastream/OBJ/view