A magnitude-2.9 earthquake jolted central Los Angeles about 2:16 a.m. Saturday, according to the U.S. Geological Survey.
The small quake was described by USGS as being centered in Silver Lake; GPS coordinates showed the epicenter to be in the Echo Park neighborhood, near the southern end of the 2 Freeway.
The temblor in the densely populated area prompted immediate reactions on social media, even before USGS had posted its usual alert about the quake.
"In Eagle Rock/HP, that was an insane jolt," one person wrote on KTLA's Facebook page.
"Felt like a weird big boom in Eagle Rock. Quick but enough to feel rattled!" another tweeted.
Others described it as short but strong.
Light-to-weak shaking was felt from Santa Monica to well east into the San Gabriel Valley, according to the USGS' "Did You Feel It?" reporting.
The quake was at a depth of about 6 kilometers, or about 3.7 miles.
It comes hours after several very large quakes shook southern Mexico on Friday afternoon and evening.