A nonsplit complex frequency-shifted PML based on recursive integration for FDTD modeling of elastic waves

In finite-difference time-domain FDTD modeling of elastic waves, absorbing boundary conditions are used to mitigate un- fields — it is difficult to adopt a complex frequency--shifted stretching function. We present an alternative implemen-tation of a PML that is based on recursive integration and does not re- quire splitting of the velocity and stress fields. Modeling re-sults show that the performance of our implementation using a stan- dard stretching function is identical to that of the convention-al split-field PML. Then we show that the new PML can be modi- fied easily to include the complex frequency-shifted stretching function. Results of models with an elongated domain show that this modification can substantially improve the performance of

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