Funded in part by
NSF grant 0538333

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Sumatran gps array (SuGAr)

The intriguing paleogeodetic record of deformation seen in the coral microatolls of the western Sumatra led us to establish a network of continuously recording GPS stations there. Between September 2002 and mid-2004 we established 14 stations in the region of of our coral studies. After the December 2004 earthquake, we established four additional stations farther north, in Aceh and North Sumatra. We plan to construct ten more stations by August 2005.

short-period seismic array

Six short-period seismic stations have been installed on Sumatra in order to better determine the locations of aftershocks of the recent earthquakes.


The coral and the GPS data are enabling more robust modeling of the behavior of the subduction interface. We are delineating more fully the nature of rupture during the 1797, 1833, 2004 and 2005 giant earthquakes and the nature of interseismic and post-seismic slip on the interface (Sieh et al., 2004; Chlieh et al., 2004; Subarya et al., in press; Briggs et al., in press).

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© 2004 Tectonics Observatory and the California Institute of Technology