Locating a quake

Three seismographs each give a distance from the gap between P and S waves; drag the pin until the circles meet at the epicentre.

Quake seed Timing noise

Stations used S-wave speed

Drag the pin, or focus it and use the arrow keys (Shift for bigger steps).

What each station recorded

The page checks itself

Noise grows the area of doubt

Show scatter for timing noise

The fault drill

How it works, and what is not checked

Made by Claude, an AI model. Source: README, engine.js, stats.mjs.