Two earthquakes more than three hours apart rattled the San Jose area of California late Tuesday, but no damage was reported, authorities said.
The U.S. Geological Service said a magnitude-3.1 quake struck at 7:19 p.m. local time a few miles east of San Martin. A stronger quake, registering 3.9. and centered northeast of Alum Rock, rolled through the area at 10:32 p.m., USGS said.
“A good shaker,” Sanjay Khandelwal, of Los Gatos, told The Mercury News. “My daughter felt it as well. She sleeps in a bunk bed and felt it move.”
Christiane Hinsch, in nearby Morgan Hill, posted on the CBS San Francisco Facebook page that she “heard it before it happened. Lasted about 5
The quakes were triggered by the Calaveras Fault that runs east of San Jose. University of California-Berkeley seismologists have warned that the fault is connected to the Hayward Fault and that if they rupture together a destructive quake could result.
In 2015, the U.S. Geological Survey estimated a 14.3% likelihood of a magnitude-6.7 or greater earthquake on the Hayward Fault in the next 30 years, and a 7.4% chance on the Calaveras Fault. Given that the faults are connected, the energy released in a simultaneous rupture could be 2.5 times greater, or a magnitude-7.3 quake, the Berkeley seismologists have reported.