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Crustal deformation at the Sumatran Subduction Zone revealed by coral rings

Sieh, Kerry and Ward, Steven N. and Natawidjaja, Danny and Suwargadi, Bambang W. (1999) Crustal deformation at the Sumatran Subduction Zone revealed by coral rings. Geophysical Research Letters, 26 (20). pp. 3141-3144. ISSN 0094-8276.

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Analyses of coral rings grown in the interval 1970–1997 reveal a geographically distinct pattern of interseismic uplift off Sumatra's western coast. At distances less than 110 km from the Sumatran trench, coral reefs are submerging as fast as 5 mm/y. At 130 and 180 km distance from the trench, they are emerging at similar rates. We suggest that a locked, or partially locked patch, located above 30 km depth on the upper surface of the subducting oceanic plate, generates this pattern.

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Additional Information:© 1999 American Geophysical Union. Received 29 June 1999; accepted 26 August 1999. We thank the crew of the vessel Dani Putra, and its owner, Daniel Madre, for safe operations on the reefs of west Sumatra. We also appreciate the technical and logistical assistance of Robert Taylor. Mike Gurnis, Paul Johnston and Dick Peltier tutored us on global sea-level rise. This work was supported by NSF grants EAR-9628301(KS), EAR-9804732(KS), EAR-9804970(SNW) and by private funds. Caltech Seismological Laboratory contribution 8661. UCSC Institute of Tectonics contribution 411.
Group:Caltech Tectonics Observatory, Caltech Tectonics Observatory. Sumatran Plate Boundary
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Subject Keywords:Tectonophysics: Dynamics, seismotectonics; Marine Geology and Geophysics: Plate tectonics
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Other Numbering System NameOther Numbering System ID
Caltech Seismological Laboratory 8661
UCSC Institute of Tectonics 411
Caltech Tectonics ObservatoryUNSPECIFIED
Record Number:CaltechAUTHORS:20110112-091033744
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Official Citation:Sieh, K., S. N. Ward, D. Natawidjaja, and B. W. Suwargadi (1999), Crustal deformation at the Sumatran Subduction Zone revealed by coral rings, Geophys. Res. Lett., 26(20), 3141–3144, doi:10.1029/1999GL005409
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21724
Deposited By: Tony Diaz
Deposited On:25 Jan 2011 19:14
Last Modified:14 Aug 2014 17:12

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