Earthquakes

**Definition:** Sudden slips on a geological fault, and the resulting ground shaking and radiated seismic energy caused by the slips, or by volcanic or magmatic activity, or other sudden stress changes in the earth. Faults are fractures along which the blocks of EARTH crust on either side have moved relative to one another parallel to the fracture.

**Tree numbers:** - G01.311.250 - N06.230.100.230.200