QDYN: a Quasi-DYNamic earthquake simulator (v1.1)

Summary

QDYN is a boundary element software package to simulate earthquake cycles (tectonic fault slip) under the quasi-dynamic approximation (quasi-static elasticity with radiation damping).

The code implements adaptive time stepping and shared-memory (OpenMP) and MPI parallelization to simulate earthquake cycles including seismic and aseismic slip. QDYN includes various forms of rate-and-state friction and state evolution laws. It handles non-planar fault geometries in 3D and 2D elastic media, as well as spring-block simulations. It has a user-friendly matlab interface and graphical output.

Features in v1.1

• rate-and-state friction, with velocity cut-offs, aging and slip laws
• heterogeneous frictional properties
• slow and fast, aseismic and seismic slip transients
• non-planar faults (currently limited to variable dip, rectangular elements)
• 3D, 2D and 1D (spring-block)
• tectonic and transient loads
• matlab wrapper and graphic output display utilities
• parallelized for shared memory systems (OpenMP)
• MPI parallelization 
• normal stress coupling
• fully coupled with SPECFEM3D via QSB (QDYN-SPECFEM Bridge)

Host website

https://ydluo.github.io/qdyn/