One type of these events 
One type of these events may be caused by recrystallization instabilities, or the propagation and linking-up of spinel-filled anticracks arising from olivine transformation. Wadati-Benioff zones are the site of many deep-focus types of these events. These events can be explained by the elastic (*) rebound theory, which posits that two sides of a strike-slip fault quickly snap back during these events. Triangulation with the difference between the arrival times of P and S waves can locate the epicenter of these events. For 10 points, name these natural disasters measured on the Richter scale.
One type of these events may be caused by recrystallization instabilities, or the propagation and linking-up of spinel-filled anticracks arising from olivine transformation.
earthquakes [or tremor; or temblor]