Paul Segall

Learn More
[1] Postseismic displacements of as much as 14 cm were recorded by GPS measurements in the 3 months following the M W 7.6 1999 Chi-Chi, Taiwan earthquake. Data from 35 continuous and 90 campaign-surveyed stations, which show continued east over west thrusting, are analyzed to estimate the postseismic slip distribution and fault geometry. Assuming the(More)
We use GPS displacements collected in the 15 months after the 1999 Chi-Chi, Taiwan earthquake (M w 7.6) to evaluate whether post-seismic deformation is better explained by afterslip or viscoelastic relaxation of the lower crust and upper mantle. We find that all viscoelas-tic models tested fail to fit the general features in the post-seismic GPS(More)
[1] The mechanics of slow slip events (SSE) in subduction zones remain unresolved. We suggest that SSE nucleate in areas of unstable friction under drained conditions, but as slip accelerates dilatancy reduces pore pressure p quenching instability. Competition between dilatant strengthening and thermal pressurization may control whether slip is slow or(More)
Slow-slip events, or 'silent earthquakes', have recently been discovered in a number of subduction zones including the Nankai trough in Japan, Cascadia, and Guerrero in Mexico, but the depths of these events have been difficult to determine from surface deformation measurements. Although it is assumed that these silent earthquakes are located along the(More)
[1] Earthquake nucleation requires reduction of frictional strength = (À p) with slip or slip rate, where , n , and p are the friction coefficient, normal stress, and fluid pressure, respectively. For rate state at fixed (À p), instabilities can occur when d ss /dv < 0, where ss is the steady state friction and v is slip rate. Shear heating increases p and,(More)
  • 1