Indonesia GPS 1991-1997

Participants:
RPI: Rob McCaffrey, Colleen Stevens, Peter Zwick
Scripps: Yehuda Bock, Jeff Genrich, Linette Prawirodirdjo
BAKOSURTANAL: Jakub Rais, Cecep Subarya, Toto Puntodewo

Some results

Among the important discoveries to date are as follow:

1. The Banda arc in the vicinity of Timor is now moving with Australia - it has been accreted to the Australian margin (see map).
2. A large part of the Bird's Head of New Guinea is moving with the Pacific plate while SE Irian Jaya moves with Australia (see map) - hence, there must be a large rapid (80 mm/yr) shear zone separating the Bird's Head from Irian Jaya.
3. Slip and strain partitioning in Sumatra is clear in the GPS results and consistent with inferences drawn from slip vector orientations.

• Irian Jaya results 1991-1993
• 1996 Irian quake coseismic displacements and aftershocks
• Southeast Asia GPS vectors
• GPS vectors relative to Sunda Shelf
• GPS vectors relative to Timor
• GPS vectors relative to Northern Australia

2002 Irian Jaya (Papua) Project

Publications

• Puntodewo, S.S.O., R. McCaffrey, E. Calais, Y. Bock, J. Rais, C. Subarya, R. Poewariardi, C. Stevens, Fauzi, J. Genrich, and P. Zwick, GPS measurements of crustal deformation within the Pacific-Australia plate boundary zone in Irian Jaya, Indonesia, Tectonophysics 237, 141-153, 1994.
• Genrich, J., Y. Bock, R. McCaffrey, E. Calais, C. Stevens, and C. Subarya, Accretion of the southern Banda arc to the Australian plate margin determined by Global Positioning System measurements, Tectonics, 15, 288-295, 1996.
• McCaffrey, R., Slip partitioning at convergent plate boundaries of SE Asia, in Tectonic Evolution of SE Asia Symposium, Geol. Soc. Special Publication No. 106, 3-18, 1996.
• Prawirodirdjo, L., Y. Bock, R. McCaffrey, J. Genrich, E. Calais, C. Stevens, S. S. O. Puntodewo, C. Subarya, and J. Rais, Geodetic observations of interseismic strain segmentation at the Sumatra subduction zone, Geophysical Research Letters, 2601-2604, 1997. (HTML reprint)
• Stevens, C., R. McCaffrey, E. Silver, Z. Sombo, P. English, and J. van der Kevie, Mid-crustal detachment and ramp faulting in the Markham Valley, Papua New Guinea, Geology, 26, 847-850, 1998.
• Stevens, C., R. McCaffrey, Y. Bock, J. Genrich, C. Vigny, C. Subarya, S.S.O. Puntodewo, and Fauzi, GPS evidence for rapid rotations about a vertical axis in a collisional setting: the Palu fault of Sulawesi, Indonesia, Geophysical Research Letters, 26, 2677-2680, 1999.
• McCaffrey, R., P. Zwick, Y. Bock, L. Prawirodirdjo, J. Genrich, C. W. Stevens, S. S. O. Puntodewo, and C. Subarya, Strain partitioning during oblique plate convergence in northern Sumatra: Geodetic and seismologic constraints and numerical modeling, Journal of Geophysical Research, 105, 28,363-28,376, 2000. (PDF)
• Genrich, J.F., Y. Bock, R. McCaffrey, L. Prawirodirdjo, C.W. Stevens, S.S.O. Puntodewo, C. Subarya, and S. Wdowinski, Distribution of slip at the northern Sumatra fault System, Journal of Geophysical Research, 105, 28,327-28,341, 2000. (PDF reprint)
• Stevens, C. W., R. McCaffrey, Y. Bock, J. F. Genrich, M. Pubellier, and C. Subarya, Evidence for Block Rotations and Basal Shear in the World's Fastest Slipping Continental Shear Zone in NW New Guinea, AGU volume on Plate Boundary Processes, S. Stein and J. Freymueller, editors, in press, 2002. ( PDF )

Link to UNAVCO for descriptions of other GPS projects.

This work is supported by the National Science Foundation.