Three Earthquakes Centered Around Lennox Area Shake SoCal, Felt in Pasadena

Three earthquakes shook Southern California within about 30 minutes Monday morning, centered about 22 miles southwest of Pasadena in the unincorporated Lennox area. 

Pasadena spokesperson Lisa Derderian said shaking was felt in Pasadena fire stations but no damage was reported in the city.

The largest jolt — a sharp, magnitude 4.0, according to the U.S. Geological Survey —was at 4:44 a.m., about one mile east-northeast of Lennox.

The first, a 3.3-magnitude at 4:15 a.m., was centered about one mile east-northeast of the Lennox area, and was felt from the South Bay to the Montebello area, and to the Burbank area, according to the USGS.

A 2.5-magnitude earthquake was also felt within a minute later near northwest Lennox.

The M4.0 that just happened was under Lennox, CA, near Inglewood. Very deep at 20 km, so everyone is at least 20 km away. Would have been felt by most people awake in LA. Movement was thrust, probably not on any mapped fault https://t.co/UIPbVH0kw5

— Dr. Lucy Jones (@DrLucyJones) April 5, 2021

Earthquake expert Dr. Lucy Jones said via Twitter the larger quake was “very deep at 20 km, so everyone is at least 20 km away. Would have been felt by most people awake in LA.”

Jones surmised the quake occurred along a previously unmapped fault.

Derderian said in Pasadena fire department companies performed a district survey and reported all conditions normal. 

This was, she said, “a reminder to be prepared because we’re well overdue and we should all be prepared not scared!”