Full-Wavefield Modelling

2D isotropic elastic wave equation (P-SV), velocity-stress, 4th-order staggered-grid finite differences with a free surface on top and sponge boundaries elsewhere.

Steps per frame 5

Velocity model

Brush radius 0.6 km

Source

Fault-plane angle 45° Dominant frequency 3.0 Hz Magnitude 6.0 Click places

Display

Gain 1.0×

Overlays model shading interfaces receivers absorbing zone P / S fronts norm. traces

Seismograms vz vx P S

Travel-time curve

Peak ground velocity

Click the stage to move the source; click near the surface to add up to 6 receivers (drag to move). Paint mode edits the model; the run restarts on release. P/S pick lines are eikonal (ray-theory) first arrivals; dots are the onset detected in the simulated trace.