California earthquakes

M1.7 earthquake 30km WSW of Lompoc, CA

A magnitude 1.7 earthquake struck 30km WSW of Lompoc, CA on Tue, Apr 28, 1987, 11:45 AM PDT (18:45 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.6 26km SSW of Solvang, CA. This one was a foreshock.

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

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The earthquake

Magnitude
1.7 (Mh), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
1987-04-28 18:45:56 UTC
Depth
5.1 km (3.2 mi), shallow
Epicenter
34.551° N, 120.764° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Depth from
Operator assigned
Station coverage gap
255°, poorly surrounded by stations
Stations used
0

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.34km W of Isla Vista, CA · 14399 days ago · 7 km deep · 80 km away
  2. 2.513km N of Santa Barbara, CA · 14390 days ago · 4 km deep · 97 km away
  3. 1.727km WSW of Lompoc, CA · 14373 days ago · 5 km deep · 5 km away
  4. 2.09km NNW of Los Alamos, CA · 14360 days ago · 5 km deep · 49 km away
  5. 2.626km SSW of Solvang, CA · 14352 days ago · 5 km deep · 55 km away

Before

  1. 2.06km SE of Goleta, CA · 14404 days ago · 5 km deep · 92 km away
  2. 2.730km WSW of Vandenberg Air Force Base, CA · 14407 days ago · 6 km deep · 12 km away
  3. 2.39km NNW of Los Olivos, CA · 14412 days ago · 5 km deep · 59 km away
  4. 2.821km NW of Santa Cruz Is. (NW end), CA · 14415 days ago · 5 km deep · 74 km away
  5. 2.314km NNE of Goleta, CA · 14418 days ago · 3 km deep · 90 km away
  6. 2.18km E of Los Alamos, CA · 14419 days ago · 5 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci616720. Read Sun, Oct 4, 2026, 1:54 PM UTC.