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First geodetic measurement of convergence across the Java TrenchConvergence across the Java Trench has been estimated for the first time, from annual Global Positioning System (GPS) measurements commencing in 1989. The directions of motion of Christmas and Cocos Island are within 1 deg of that predicted by the No-Net Rotation (NNR) NUVEL-1 plate motion model for the Australian plate although their rates are 25% and 37% less than predcited, respectively. The motion of West Java differs significantly from the NNR NUVEL-1 prediction for the Eurasian plate with a 1 deg difference in direction and a 40% increase in rate. We infer that either West Java moves with a distinct Southeast Asian plate or this region experiences plate margin deformation. The convergence of Christmas Island with respect to West Java is 67 +/- mm/yr in a direction N11 deg E +/- 4 deg which is orthogonal to the trench. The magnitude of convergence agrees well with rescaled NUVEL-1 relative plate model which predicts a value of 71 mm/yr between Australia and Eurasia. The direction of motion matches the direction inferred from earthquake slip vectors at the trench but may be more northerly than the N20 deg E +/- 3 deg predicted by NUVEL-1. On June 2, 1994, almost a year after the last GPS survey, an M(sub W) = 7.5 earthquake with slip vector direction N5 deg occurred south of central Java.
Document ID
19950047318
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tregoning, P.
(Univ. of South Wales Sydney, Australia)
Brunner, F. K.
(Univ. of South Wales Sydney, Australia)
Bock, Y.
(Univ. of California, La Jolla, CA United States)
Puntodewo, S. S. O.
(National Coordination Agency for Surveying and Mapping Cibinong, West Java, United States)
Mccraffrey, R.
(Rensselaer Polytechnic Institute, Troy, NY, United States)
Genrich, J. F.
(Univ. of California, La Jolla, CA United States)
Calais, E.
(Univ. of California, La Jolla, CA United States)
Rais, J.
(National Coordination Agency for Surveying and Mapping Cibinong, West Java, United States)
Subarya, C.
(National Coordination Agency for Surveying and Mapping Cibinong, West Java, United States)
Date Acquired
August 16, 2013
Publication Date
September 15, 1994
Publication Information
Publication: Geophysical Research Letters
Volume: 21
Issue: 19
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
95A78917
Funding Number(s)
CONTRACT_GRANT: NSF EAR-88-17067
CONTRACT_GRANT: NSF EAR-89-08759
CONTRACT_GRANT: NSF EAR-91-14349
CONTRACT_GRANT: NSF EAR-90-04376
CONTRACT_GRANT: NAGW-2641
CONTRACT_GRANT: NSF EAR-91-14864
Distribution Limits
Public
Copyright
Other

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