M2.7 earthquake 18km NE of Avalon, CA

A magnitude 2.7 earthquake struck 18km NE of Avalon, CA on Thu, Oct 29, 1987, 8:45 PM PST (04:45 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.7 41km WSW of Carlsbad, CA. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 158 in the 60 days after this one and 191 in the 30 days before it.

The first 60 of 158.

From the USGS Earthquake Hazards Program and its partner networks, event ci734014. Read Fri, Oct 2, 2026, 4:28 PM UTC.