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NSF grant 0538333

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As of August 2005, the SuGAr network consisted of 24 permanent stations along the Sumatran plate boundary (Figure 1). Prior to the giant Aceh-Andaman earthquake of December 2004, the SuGAr network was showing steady convergence of the outer-arc islands toward the mainland coast (Figure 2). During the Aceh-Andaman earthquake, the network recorded sub-centimeter motions toward the south and east. During the Nias-Simeulue earthquake of March 28th, stations from the Equator north recorded substantial motions (Figure 3).

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Fig 1 - click to enlarge

Existing stations of the Sumatran cGPS Array (SuGAr).

Fig 2 - click to enlarge

Average annual horizontal motion for the six stations installed in 2002.

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© 2004 Tectonics Observatory and the California Institute of Technology