The <hypocentre> is the point where rupture begins. The <epicentre> is its projection onto the <Earth>'s surface. An <earthquake centroid> is an effective spatial average of moment release over the rupture, with a corresponding mean release time. \b[Initiation and average release need not occur at the same place or time], especially for an extended, asymmetric rupture.

Solution

Past exam of the physics of the Earth as a Planet course of the University of Cambridge / 2014 / Paper 1 / 1 / a / Solution

 Solution (source code)