Geodetic observations of interseismic strain segmentation at the Sumatra subduction zone

Details Geodetic observations of interseismic strain segmentation at the Sumatra subduction zone Geodetic observations of interseismic strain segmentation at the Sumatra subduction zone

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2601p&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 21, p. 2601-2604

Physics

Geophysics

59

Geodesy And Gravity: Crustal Movements-Interplate, Marine Geology And Geophysics: Plate Tectonics, Geodesy And Gravity: Space Geodetic Surveys, Tectonophysics: Continental Margins And Sedimentary Basins

Scientific paper

Deformation above the Sumatra subduction zone, revealed by Global Positioning System (GPS) geodetic surveys, shows nearly complete coupling of the forearc to the subducting plate south of 0.5°S and half as much to the north. The abrupt change in plate coupling coincides with the boundary between the rupture zones of the 1833 and 1861 (Mw>8) thrust earthquakes. The rupture boundary appears as an abrupt change in strain accumulation well into the interseismic cycle, suggesting that seismic segmentation is controlled by properties of the plate interface that persist through more than one earthquake cycle. Structural evidence indicates that differences in basal shear stress may be related to elevated pore pressure in the north.

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