SAN DIEGO  - An earthquake was felt over a wide area of San Diego Monday morning.

The 4.4 magnitude earthquake struck at 6:20 a.m.  It was centered in the Pacific, about 31 miles southwest of Rosarito Beach and 42 miles south southwest of Imperial Beach.  The depth is reported at 4 miles.

An earthquake of this magnitude is classified as light by the U.S. Geological Survey.

The San Diego fire department immediately instituted their earthquake procedures, where bay doors for the fire equipment are opened so they won't become jammed during an earthquake.

A caller from Chula Vista told San Diego 6 News that the earthquake woke her up.

"We felt it pretty good here but so far the phones have been quiet," said San Diego County sheriff's Lt. Hope Andrews, speaking from Kearny Mesa.  "There's been no injury and no damage reports."

The U.S.G.S. reports people in most areas of San Diego County, west of the mountains, felt the earthquake. 

The quake was felt at the San Diego 6 studios in Kearny Mesa.  Most people on the second and third floors felt a quick rocking, while most people on the first floor of the station did not feel the earthquake.

Preliminary estimates by the U.S.G.S had placed the earthquake's magnitude as high as 5.0 before setting the magnitude at 4.4.  A 3.6 magnitude earthquake was recorded in the same area 23 minutes later.