📈 Volcano Seismic Network: S minus P Times and Earthquake Location (2D)

Map of seismometers on a ring around a volcano, with a hidden earthquake beneath it. The S minus P delay at each station gives its distance to the source; the circles from several stations meet near the epicentre, and a least-squares fit finds the place. Set the number of stations, the size of the network, the wave speeds, the picking error and the position and depth of the event, and see the scatter of many noisy locations and the error predicted from the geometry. The distance conversion, the noise-free fit, the scatter against the covariance and the travel-time slope are checked numerically, with four in-page numerical checks.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install