Crustal deformation at the Sumatran subduction zone revealed by coral rings

TitleCrustal deformation at the Sumatran subduction zone revealed by coral rings
Publication TypeJournal Article
Year of Publication1999
AuthorsWard SN, Natawidjaja DH, Suwargadi BW, Sieh KE
JournalGeophysical Research Letters
Volume26
Pagination3141-3144
Date PublishedOct
ISBN Number0094-8276
Accession NumberWOS:000083160000023
Abstract

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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