Fig. 4From: OpenSWPC: an open-source integrated parallel simulation code for modeling seismic wave propagation in 3D heterogeneous viscoelastic mediaImplemented source time functions and their amplitude spectra: a boxcar function, b triangle function, c Herrmann function, d cosine function, e Küpper’s wavelet and f \(t \exp [-t]\) function. In each panel, the left figure shows the temporal variation of the source time function and the right figure shows the amplitude spectrum. The horizontal axes are normalized by the rise time \(T_{R}\) Back to article page