Volcanoes often look deceptively quiet until the moment they unleash towering plumes of ash and gas, yet the precise switch that turns a gentle rumble into a devastating blast has remained stubbornly ...

On Monday morning, a magnitude 3.9 earthquake jolted the Geysers geothermal field in northeastern Sonoma County, capturing the attention of local residents and seismology enthusiasts alike. According ...

Since the magnitude 4.0 event, two smaller quakes—located deeper in Earth’s crust than the larger one—have already occurred: ...