Spectral formulation of the boundary integral equation method for antiplane problems

A spectral formulation of the boundary integral equation method for antiplane problems is presented. The boundary integral equation method relates the displacement discontinuity and the shear stress at an interface between two half-planes. It involves evaluating a space-time convolution of the shear stress or the displacement discontinuity at the interface. In the spectral formulation, the convolution with respect to the spatial coordinate is performed in the spectral domain. The leads to greater numerical efficiency. Prior work on the spectral formulation of the boundary integral equation method has performed the elastodynamic convolution of the displacement discontinuity at the interface. In the present work, the convolution is performed of the shear stress at the interface. The formulation is validated by numerically calculating the response of the interface to harmonic and to impulsive disturbances, and comparing with known analytical solutions. To illustrate use of the method, dynamic rupture propagation with a slip-weakening friction law is simulated.