6 miles to the southeast of Ontario, California, there was a little earthquake of magnitude 3.6.
Seven miles below the epicentre, at a shallow depth, the earthquake took place.
Within the next few hours or minutes, the precise earthquake's magnitude, epicentre, and depth may change.
The European-Mediterranean Seismological Centre (EMSC) later released a second assessment estimating the earthquake's magnitude to be 4.1.
Although the earthquake shouldn't have caused any substantial damage, many individuals presumably felt a slight vibration.
27 less powerful earthquakes, which people generally don't feel, were also recorded.