You are here: Home

Welcome to the U.S. Geological Survey Earthquake Hazards Program

Click maps for more information

Latest Earthquakes

World (Magnitude 4+)

Sun May 11 22:00:39 GMT

Latest World Earthquakes Map

USA (Magnitude 1+)

Sun May 11 22:30:31 GMT

Latest USA Earthquakes Map Latest Alaska Earthquakes Map Latest Hawaii Earthquakes Map Latest Puerto Rico Earthquakes Map Latest USA Earthquakes Map

Today's Earthquake Fact

A seismic wave shadow zone was discovered in about 1910, by measuring how P and S waves travel through the earth and out the other side. From the lack of S waves and a great slowing of the P wave velocity (by about 40%), it was deduced that the outer core is made of liquid. The shadow zone also defined the diameter of the core.