Magnitude 4.0 Earthquake Strikes Near Los Angeles



Los Angeles residents were woken up this morning when an earthquake temblor occurred at 4:40 AM Pacific Coast time in Los Angeles. The trembler was centered  near LAX centered at the cross streets, Prairie and Century boulevards, about 1 mile east-northeast of Lennox, California.

A 2.5 magnitude aftershock that was recorded only minutes later.  There were no  reports of any damage or injuries.



M4.10 – 1.4 mi SE of Inglewood


2021-04-05 11:44:01.920 (UTC)

Shake Alert Event ID


Summary Report



Speed of Alert

Initial alert after origin time: 4.6 s

Final alert update after origin time: 10.9 s

Magnitude Accuracy

Initial Shake Alert: M4.00

Final Shake Alert: M4.00

ANSS report: 127 s after origin, M4.10

Alert Location from Reviewed Location

Initial alert: 1 km (0 mi) SW

Final alert: 2 km (1 mi) N

Number of Stations Reporting

8 within 10km of epicenter

157 within 100km of epicenter

67 used in final Shake Alert update

Performance for Nearby Cities

CityDistanceWarning TimemmiInglewood2 km (1 mi)~1.1 sIVLos Angeles15 km (9 mi)~2.4 sIIISanta Monica16 km (10 mi)~2.7 sIIPasadena29 km (18 mi)~5.3 sII


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

Photo Source- Google Maps

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