Quasistatic or quasidynamic rate–state friction (QRSF) simulators are used to study the mechanics of faults (e.g., Shibazaki and Shimamoto, 2007). The displacement discontinuity method (DDM; Crouch and Starfield, 1983) meshes the fault or faults into N elements and constructs a matrix of Green’s functions (GFs) relating slip to stress. The simulator evolves strength and slip in time. Usually, the most expensive part of a simulation time step is the matrix–vector product (MVP) of the slip distribution with the DDM matrix; the straightforward implementation performs O(N2) operations. A simulator performs thousands to millions of MVPs...

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