Blasts from quarry or mining activity can also produce seismic waves that look like earthquakes. Natural phenomena such as storms can also cause ground vibrations. These ground vibrations from such ...

An earthquake map from the U.S. Geological Survey (USGS) shows that minor earthquakes hit nine states on Friday morning. The earthquakes come a week after a magnitude 7.0 earthquake struck off the ...

Volcanoes and earthquake activity often occur in similar places in narrow zones of activity, as shown on the map. These zones include: the Pacific Ring of Fire around the Pacific Ocean the Mid ...

Additional information collected about the earthquake may also prompt U.S.G.S. scientists to update the shake-severity map. Aftershocks can occur days, weeks or even years after the first earthquake.

Additional information collected about the earthquake may also prompt U.S.G.S. scientists to update the shake-severity map. An aftershock is usually a smaller earthquake that follows a larger one ...