Microearthquake

Microearthquake

A microearthquake (or microquake) is a very low intensity earthquake which is usually three or less on the Richter scale. In addition to having natural tectontic causes, they may also be seen as a result of underground nuclear testing or even large detonations of conventional explosives for producing excavations. They normally cause no damage to life or property.

Microquakes occur often near volcanoes as they approach an eruption, and frequently in certain regions exploited for geothermal energy, such as near Geyserville in Northern California. These occur so continuously that the current USGS event map for that location usually shows a substantial number of small earthquakes at that location.