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NSF grant 0538333

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Three tectonic domains of the Sumatran plate boundary.  In the southern domain, the trench-slope break, outer-arc ridge, forearc basin and Sumatran fault are the least irregular.  In the Central domain, the fore-arc region is splintered by secondary faults, the Sumatran fault strikes markedly across the subduction isobaths.  The Investigator fracture zone (IFZ) is subducting beneath the Central domain.  These structural features seem to play a role in determining the source parameters of large earthquakes.  Velocity vectors are from 1990s GPS campaigns.
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© 2004 Tectonics Observatory and the California Institute of Technology