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NSF grant 0538333

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Our mapping of the 1900-km-long Sumatran fault, using topo maps and aerial photographs, showed that (unlike the San Andreas) it is highly segmented. Large dilatational stepovers appear to have limited the extent of historical ruptures and to have limited the size of historical earthquakes to about M 7.5. Total offset across this long fault may be only 20 to 100 km, and current slip rates vary from about 11 to 27 mm/yr.

Related publications:

Sieh and Natawidjaja (2000) present the segmented geometry of the fault, its relationship to the Sumatran volcanic arc and subduction zone, and speculations about its developmental history and earthquake potential.
Neotectonics of the Sumatran fault, Indonesia

Sieh, K. et al. (1994) describe preliminary studies of late Quaternary slip rate variations along the fault.
Active tectonics of Sumatra

Click on the thumbnail images
for more detailed information.

Sumatran Fault System
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Sumatra GIS map
high res version 15MB

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