GPS measurements of crustal deformation within the Pacific-Australia plate boundary zone in Irian Jaya, Indonesia

S. S O Puntodewo, R. McCaffrey, E. Calais, Y. Bock, J. Rais, C. Subarya, R. Poewariardi, C. Stevens, J. Genrich, Fauzi, P. Zwick, Shimon Wdowinski

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Global Positioning System (GPS) measurements made in 1991, 1992 and 1993 provide preliminary estimates of slip distribution between the Australian and Pacific plates in Irian Jaya, Indonesia. We interpret the GPS results with constraints from earthquake mechanisms and slip vectors, recent marine surveys, and geology. Three GPS sites in southeastern Irian Jaya show motions that are within 10 mm/yr of the expected motion of Australia. A coast-to-coast N-S baseline along 140.5°E crosses all known onland regions of active deformation but reveals no more than 15 mm/yr of shortening and 20 mm/yr of left-lateral shear in the 27-month period. The remaining 40 mm/yr of expected convergence between the Pacific and Australian plates probably occurs at the New Guinea trough. GPS sites on the island of Biak, at 136°E, and at Sorong, near the western tip of Bird's Head (at 131°E), both move 90-100 mm/yr in a WSW direction relative to Irian Jaya, but less than 15 mm/yr relative to each other. These sites are on either side of the Sorong fault and demonstrate that it is not presently the major boundary between the Australian and Pacific plates. Instead the plate boundary is now south of the Sorong and Biak sites. Earthquakes suggest possible structures that accomodate motion between Bird's Head and Australia but the relative importance of them remains uncertain.

Original languageEnglish (US)
Pages (from-to)141-153
Number of pages13
JournalTectonophysics
Volume237
Issue number3-4
DOIs
StatePublished - Oct 30 1994
Externally publishedYes

Fingerprint

Indonesia
Global Positioning System
crustal deformation
Pacific plate
plate boundary
Australian plate
GPS
birds
coasts
slip
earthquakes
New Guinea (island)
earthquake mechanism
bird
coast
geology
troughs
trough
shear
earthquake

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

Cite this

Puntodewo, S. S. O., McCaffrey, R., Calais, E., Bock, Y., Rais, J., Subarya, C., ... Wdowinski, S. (1994). GPS measurements of crustal deformation within the Pacific-Australia plate boundary zone in Irian Jaya, Indonesia. Tectonophysics, 237(3-4), 141-153. https://doi.org/10.1016/0040-1951(94)90251-8

GPS measurements of crustal deformation within the Pacific-Australia plate boundary zone in Irian Jaya, Indonesia. / Puntodewo, S. S O; McCaffrey, R.; Calais, E.; Bock, Y.; Rais, J.; Subarya, C.; Poewariardi, R.; Stevens, C.; Genrich, J.; Fauzi; Zwick, P.; Wdowinski, Shimon.

In: Tectonophysics, Vol. 237, No. 3-4, 30.10.1994, p. 141-153.

Research output: Contribution to journalArticle

Puntodewo, SSO, McCaffrey, R, Calais, E, Bock, Y, Rais, J, Subarya, C, Poewariardi, R, Stevens, C, Genrich, J, Fauzi, Zwick, P & Wdowinski, S 1994, 'GPS measurements of crustal deformation within the Pacific-Australia plate boundary zone in Irian Jaya, Indonesia', Tectonophysics, vol. 237, no. 3-4, pp. 141-153. https://doi.org/10.1016/0040-1951(94)90251-8
Puntodewo, S. S O ; McCaffrey, R. ; Calais, E. ; Bock, Y. ; Rais, J. ; Subarya, C. ; Poewariardi, R. ; Stevens, C. ; Genrich, J. ; Fauzi ; Zwick, P. ; Wdowinski, Shimon. / GPS measurements of crustal deformation within the Pacific-Australia plate boundary zone in Irian Jaya, Indonesia. In: Tectonophysics. 1994 ; Vol. 237, No. 3-4. pp. 141-153.
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