Abstract
Geologic data from field observations and satellite imagery analysis contribute a constraint on the “pivot line” between uplift and subsidence of coral reefs, indicating the downdip rupture extent. Geodetic global positioning system (GPS) data contribute vector displacements of points on islands along the archipelago, indicating amount and direction of slip alongstrike of the rupture. Geodetic and geologic data are sensitive not only to rapid coseismic fault movement, but also to slower motion across the plate interface that occurs postseismically. Consequently, the source dimensions and slip pattern estimates based on various geodetic and geologic data differ from purely seismic estimates. A more complete understanding is emerging, based upon joint inversions that use various combinations of all available data, of ways in which sudden slip and gradual afterslip occurred in each of these two major plate boundary ruptures.
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