A SpaceX spacecraft caused a sonic boom over California as it returned to Earth's atmosphere. The SpaceX Dragon was returning from a supply run to the International Space Station when it broke the ...

California has dozens of earthquakes every day. Most are below 3.0 magnitude, so small that they aren’t felt.

The Great Alaska Earthquake was the most powerful earthquake ever recorded in the United States. Its violent tremors reshaped ...

Could a monster earthquake sink a portion of Northern California? A new study calculates the risk of where and how much land ...

Nearly a mile deep, the Pacific Ocean volcano known as Axial Seamount is drawing increasing scrutiny from scientists who only ...

California has experienced multiple earthquakes in the last two minutes in an area being closely monitored for a major quake.

Authorities are investigating what appear to be radical views that Guy Edward Bartkus expressed online in the months before ...

California experienced three earthquakes in an area being closely monitored for a major quake on Thursday and Friday.