The U.S. Geological Survey said a magnitude 7.2 earthquake shook southern Peru on Thursday, though there were no immediate reports of damage or injury.
The U.S. Geological Survey reported a 4.0-magnitude earthquake Friday off the coast of Catalina Island, but later determined that the quake never actually happened.
April is Earthquake Preparedness Month.
A preliminary 3.4-magnitude earthquake struck early Tuesday morning about 4 miles east of Ontario, according to the U.S. Geological Survey.
A powerful 7.3 magnitude earthquake shook off the coast of Fukushima in northern Japan on Wednesday evening, triggering a tsunami advisory.
A small earthquake struck Monday near Palm Springs.
A preliminary magnitude 4.1 earthquake struck Saturday evening in Ventura County. There were no immediate reports of damage or injuries.
A preliminary 3.2-magnitude earthquake struck the Valencia area on Monday morning, the U.S. Geological Survey said.
A preliminary 3.9 magnitude earthquake struck Thursday afternoon in Ventura County.
A 3.3-magnitude quake struck Tuesday in Cudahy near Downey, USGS says.
A preliminary 3.5-magnitude earthquake was reported in a Ventura County town Friday night.
A preliminary magnitude 3.5 earthquake shook San Bernardino County Friday. The quake struck shortly before noon on New Year's Eve.
A 6.2 magnitude earthquake was recorded off the coast of northern California just after noon Monday .
More than 40 earthquakes were recorded in 24 hours off the Oregon coast, but experts say that the cluster of quakes is not cause for alarm.
The quake occurred at 5:52 a.m. (1052 GMT) and its epicenter was in the Amazon region, 42 kilometers (26 miles) north northwest of the city of Barranca. It had a magnitude of 7.5, according to the U.S. Geological Survey.
A preliminary 3.3-magnitude earthquake was reported in Riverside County Friday night.
A preliminary 4.7-magnitude earthquake was reported in San Luis Obispo County.
A 3.6 magnitude earthquake rattled early Sunday morning near East Los Angeles.
Two strong earthquakes - both over 6.0 in magnitude - struck off the coast of the Big Island in Hawaii on Sunday.
A preliminary 3.0-magnitude earthquake was reported in the Yucca Valley area Thursday night.