Earthquakes and seismic activity often happen with sudden movements underground with tectonic plates. Seismographs are used by scientists to measure the time, location and strength of an earthquake.

BERKELEY (KRON) – With the recent earthquakes in California last week, now may be a good time to not only spruce up your emergency preparedness kit, but to also brush up on earthquake terminology!

The Fourth of July Ridgecrest earthquake measured 6.4 magnitude. It was the strongest quake to hit Southern California in years, but it was actually significantly less powerful than some earlier ...