This post has been updated. See note below.

A 4.5 earthquake hit near Yorba Linda at 9:33 a.m., the latest in a series of earthquakes to hit the area.

[Updated, 9:46 a.m. Aug. 8: Officials revised their estimate of the earthquake's magnitude to 4.1 from 4.5.]

[Updated, 11:12 a.m. Aug. 8: USGS officials later in the morning again revised the earthquake magnitude back to 4.5.]

The first earthquake hit near Yorba Linda at 11:23 p.m.; the second — upgraded from an initial magnitude of 2.2 — followed about a minute later, according to data from the U.S. Geological Survey. About a dozen aftershocks ranging from magnitudes of 1.2 to 2.2 rumbled the same area until about 3 a.m. Wednesday.

There was no immediate word of injuries or damage, but the quake was felt over a wide area.