About 55 earthquakes a day – 20,000 a year – are recorded by the National Earthquake Information Center. Most are tiny and barely noticed by people living where they happen. But some are strong enough ...

A research team studied earthquake hazard maps from five countries and found that all the maps seemed to overpredict the historically observed earthquake shaking intensities. In analyzing the possible ...

For each whole number increase in magnitude, the seismic energy released increases by about 32 times. That means a magnitude 7 earthquake produces 32 times more energy — or is 32 times stronger — than ...

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 ...

There are a number of ways to measure the magnitude of an earthquake. Most scales are based on the amplitude of seismic waves recorded on seismometers. These scales account for the distance between ...

A California Geological Survey map released earlier this year depicts just how intense and damaging the shaking from future earthquakes will be across the state, revealing where the threat is most ...

The last significant North Coast quake was just over a year ago. On Dec. 5, 2024, a M7.0 earthquake struck offshore of Cape Mendocino. A little less than two years earlier, the Dec. 20, 2023, M6.4 ...

Experts say the earthquake was relatively small and is not expected to have caused structural damage. Communities across New England all the way down to Cape Cod and Martha's Vineyard felt a 3.8 ...