According to the U.S. Geological Survey, a swarm of small earthquakes struck Ontario Saturday morning, rattling some nerves but not causing major damage.
The first 3.5 magnitude earthquake struck around 10:05 a.m. and was centered about three miles southeast of Ontario, USGS said.
It was followed by another 3.9 magnitude quake centered east-southeast of Ontario at 10:34 a.m. almost 30 minutes after the first.
At 11:45 a.m., a 2.6 magnitude aftershock struck about two miles southeast of Ontario.
The USGS also recorded dozens of smaller quakes, between magnitudes 1 and 2 throughout the day.
“All of a sudden everything shook,” said Lucy Campa, a store clerk in Ontario. “I felt like the truck was coming through the store. Especially with all the merchandise, it felt a lot stronger.”
“That second one hit and it was just, it was a bigger one, it was more noticeable and everyone froze for a second,” said Gaby Galdamez of Ontario.
There were no immediate reports of significant damage.
Eyewitnesses reported feeling shaking in Ontario, Fontana, San Bernardino, Riverside, Pomona and Chino.
“Today we are having a small swarm in the Fontana Seismicity Lineation, a northeast-striking line of many small quakes,” seismologist Dr. Lucy Jones said in a post on X.
Today we are having a small swarm in the Fontana Seismicity Lineation, a northeast-striking line of many small quakes. Today we have so far M3.9, M3.5 and many M1s and M2s. I've seen this tyoe of cluster in Fontana dozens of times in my decades watching SoCal quakes.
— Dr. Lucy Jones (@DrLucyJones) September 7, 2024
