Earthquakes, Circles and Spheres

Estimating distance and locating epicentre with the help of a little geometric trick.

Generally P-wave (pressure) is horizontal shaking, S-wave (shear) vertical. S is usually stronger and takes about 6x the time to arrive as the P. Distance in km is approx. 6x time between these in seconds.


Author: Danny Ayers

Web research and development, music geek, woodcarver. Originally from rural northern England, now based in rural northern Italy.

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