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REVISION SUBMITTED TO JOURNAL OF GEOPHYSICAL RESEARCH, JUNE 2008 Spectral-element modeling of spontaneous earthquake rupture
 

Summary: REVISION SUBMITTED TO JOURNAL OF GEOPHYSICAL RESEARCH, JUNE 2008
Spectral-element modeling of spontaneous earthquake rupture
on rate-and-state faults: Effect of velocity-strengthening friction
at shallow depths
Y. Kaneko
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, USA
N. Lapusta
Division of Geological and Planetary Sciences and Division of Engineering and Applied Science, California
Institute of Technology, Pasadena, USA
J.-P. Ampuero
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, USA
Abstract. We develop a spectral-element method (SEM) for simulating dynamic rup-
ture on rate-and-state faults and use it to study how the rupture is affected by a shal-
low fault region of steady-state velocity-strengthening friction. Our comparison of the
developed SEM and a spectral boundary-integral method (BIM) for an anti-plane (two-
dimensional) test problem shows that, for the finest resolution we use, the two meth-
ods produce virtually identical solutions, with negligible differences in rupture arrival times
and peak slip velocities (less than 0.05% of their absolute values). The convergence with
grid reduction of the developed SEM is comparable to that of BIM. We also use the test
problem to compare numerical resolution required for different state evolution laws and

  

Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Geosciences