Magnitude 4.5 earthquake is latest warning of San Andreas’ power

A magnitude 4.5 earthquake shook a large portion of Southern California on Tuesday, and was felt from San Diego to Santa Clarita, authorities said.

Tuesday’s temblor struck at 4:49 a.m. about seven miles north of Cabazon and 85 miles east of downtown Los Angeles. The epicenter was close to the San Gorgonio Pass, through which Interstate 10 connects Palm Springs with San Bernardino.

The strongest shaking — Intensity Level 6 — occurred in an uninhabited mountainous area in Riverside County. The cities of Riverside and San Bernardino felt only “light” shaking calculated as Intensity Level 4, while many areas in L.A. and Orange counties felt only “weak” Intensity Level 2 or 3 shaking.

There were no immediate reports of damage. The U.S. Geological Survey’s earthquake early warning system under development worked as expected, giving scientists in Pasadena — about 80 miles away from the epicenter — 26 seconds of warning before the shaking arrived, according to a Southern California Seismic Network report.

The quake was followed by dozens of smaller aftershocks, including a magnitude 3.2 at 4:51 a.m.

Riverside and San Bernardino felt Intensity 4 "weak" shaking from Tuesday's earthquake. Intensity 6 "strong" shaking was only felt in an unpopulated mountainous area in Riverside County.

Riverside and San Bernardino felt Intensity 4 “weak” shaking from Tuesday’s earthquake. Intensity 6 “strong” shaking was only felt in an unpopulated mountainous area in Riverside County. (USGS)

This marks the second time in little more than a month that the region has been hit by a small quake felt over a large area. On April 5, a magnitude 5.3 quake centered in the Channel Islands off Santa Barbara County rattled nerves.

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