Earthquake | PreventionWeb
Earthquake is a term used to describe both sudden slip on a fault, and the resulting ground shaking and radiated seismic energy caused by the slip, or by volcanic or magmatic activity, or other sudden stress changes in the Earth (USGS, no date).
United States Global Earthquake Model Foundation Us Federal Emergency Management Agency Us Geological Survey Journal Of Geophysical Research United Nations
Source: preventionweb.net