A series of minor earthquakes occurred in Ontario on Saturday morning, as reported by the U.S. Geological Survey.
The first tremor, with a magnitude of 3.5, was registered at approximately 10:05 a.m., located about three miles southeast of Ontario. This was soon followed by a second earthquake, measuring 3.9 in magnitude, which struck at 10:34 a.m. in the east-southeast direction of Ontario, nearly half an hour after the initial quake.
An aftershock registering 2.6 in magnitude followed at 11:45 a.m., just two miles southeast of the city. Throughout the day, the USGS recorded numerous smaller earthquakes, ranging from magnitudes 1 to 2.
Local residents expressed their experiences during the tremors. Lucy Campa, a store clerk, described the sensation of everything shaking, comparing it to a truck driving through her store. “It felt a lot stronger with all the merchandise around,” she said. Gaby Galdamez, another resident, noted the noticeable impact of the second quake, mentioning that everyone around her momentarily froze in response.
Fortunately, there were no immediate reports of major damage due to the earthquakes. Reports of shaking were felt in various nearby areas, including Fontana, San Bernardino, Riverside, Pomona, and Chino.
Seismologist Dr. Lucy Jones explained on social media that the tremors were part of a small swarm occurring along the Fontana Seismicity Lineation, a northeast-aligned zone known for many minor quakes.