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Napa County firefighters spray foam on hot spots from a fire at a mobile home park following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3:00 … Continue reading

Powerful earthquake rocks central Sulawesi in Indonesia; 1 dead. A powerful earthquake has rocked central Sulawesi in Indonesia and authorities have issued a tsunami warning. Earthquake: Earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one -like seismic waves can also be caused by explosions underground. These explosions may be set off to break rock while making tunnels for roads, railroads, subways, or mines. Tags: earthquakes, happen, Did you feel that? Magnitude The USGS reports the at a magnitude 2.6. s of magnitudes 1 through 3 are typically "not felt except by a very few under especially favorable conditions," according to the USGS. What is an ? s are the vibrations caused by breaking under stress. The underground surface along which the rock breaks and moves is called a fault plane.