The vibrations produced by earthquakes are detected, recorded, and measured by instruments call seismographs. The zig-zag line made by a seismograph, called a “seismogram,” reflects the changing intensity of the vibrations by responding to the motion of the ground surface beneath the instrument. From the data expressed in seismograms, scientists can determine the time, the epicenter, the focal depth, and the type of faulting of an earthquake and can estimate how much energy was released.

Below is a list of earthquakes with a 7.0 or greater magnitude as measured by the Richter Scale in the last 30 days. You can also see an icon of a wave if there is a danger of a Tsunami.