openseismo
Locate an earthquake from seismograph arrivals, in three sessions.
- Session 1: Two waves, one gap: how far away was it? (Level 1, 60 min)
- Session 2: Three circles pin down the epicentre (Level 2, 75 min)
- Session 3: Real-world location: Geiger's method, pick errors and geometry (Level 3, 90 min)