CONTRA COSTA COUNTY, CA - A preliminary 2.2 magnitude quake was detected close to San Ramon Friday evening, the U.S. Geological Survey reported.

The federal government and earthquake experts blamed a technical glitch for the alert that sent warnings hundreds of miles away last week.

Aftershocks have been recorded for both earthquakes. On Dec. 8, Japanese authorities warned an even more powerful earthquake could strike within the next week and called on residents from the northernmost island of Hokkaido down to Chiba prefecture, east of Tokyo, to be on high alert.

SAN BENITO COUNTY, CA - A preliminary 2.0 magnitude quake was detected close to San Juan Bautista Friday afternoon, according to the U.S. Geological Survey.

Several earthquakes, the largest measured at magnitude-3.3, were reported Thursday morning in Ventura County. The earthquakes were centered near Fillmore, about 25 miles northeast of Ventura. Shaking was reported in Fillmore, Moorpark, Ventura and Santa Paula.

A minor, 3.1-magnitude earthquake struck in Southern California on Thursday, according to the United States Geological Survey. The temblor happened at 10:27 a.m. Pacific time about 8 miles northwest of Fillmore, Calif., data from the agency shows.

The clusters of earthquakes have all been underneath the East Bay suburb of San Ramon, which is close to the Calaveras fault. There were at least 19 earthquakes of magnitude 2 or greater on Monday alone.

Viral TikToks claim that recent geomagnetic storms caused Japan's earthquake oand might predict an imminent Cascadia quake.