An earthquake centered just north of Yorba Linda on the outskirts Los Angeles shook residents at 4:56pm local time this afternoon (April 23.)
The 3.8 quake resulted in light shaking in the Riverside-San Bernardino region, and was felt as far away as Aliso Vejio and Altadena. The same area had a 5.4 earthquake in July last year.
There were no reports of damage, with locals describing a single jolt, followed by several seconds of shaking. Further details on the quake are available from the USGS site here.
