M3.6 earthquake 41km WSW of Lompoc, CA

A magnitude 3.6 earthquake struck 41km WSW of Lompoc, CA on Fri, Feb 27, 1987, 2:43 PM PST (22:43 UTC), 5 km (3 mi) below the surface.

Map

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

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.58	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · 10 stations
3.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

The USGS’s account of the effects of this earthquake.

Felt (III) at Lompoc. Also felt at San Luis Obispo.

From the USGS event page for ci718003. U.S. Geological Survey text and figures are in the public domain.

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: 19 in the 60 days after this one and 6 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ci718003 (also filed as usp00032uw). Read Thu, Oct 1, 2026, 9:15 PM UTC.