Geology & Earth Science

Seismic Travel-Time Curves

t_P = Δ/v_P, t_S = Δ/v_S

The fast P wave and slower S wave leave an earthquake together but arrive farther apart the more distant the seismograph — the growing gap between the two lines is exactly how a station reads off its distance to the epicentre.

Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own Gif encoder (no GPU, no ffmpeg, no external packages).