SEM2DPACK is a simulator of 2D elastic wave propagation and fracture dynamics that applies the Spectral Element Method (SEM, similar to mass-lumped high-order finite element methods). Flexibility and accuracy are the main goals. Although the emphasis is currently on computational seismology and earthquake source dynamics, this tool might attract a wider audience in computational mechanics, research, and engineering. License: GNU General Public License (GPL) Changes: This version introduces a velocity and state dependent friction law for dynamic faults, with fast velocity-weakening at high slip rates.

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