Mike McGuire. The 7.0-magnitude quake is one of at least 17 events that rattled Northern California on Thursday, with most of the seismic activity concentrated around Humboldt County. At least ...

A mobile app that earlier this month alerted more than half a million people in Northern California in advance ... and use data during the course of seismic activity. Using the motion sensors ...

Northern California is accustomed to frequent earthquakes, particularly in areas like Cobb and The Geysers, where geothermal activity can trigger smaller quakes regularly. As a result, a 4.7 quake ...

This week was the USGS Northern California Earthquake Hazards Workshop (NCEHW). I joined other earthquake hazards professionals for three days of virtual talks and discussions about the latest ...