M1.8 earthquake 23 km N of Amboy, Washington
A magnitude 1.8 earthquake struck 23 km N of Amboy, Washington on Thu, Mar 2, 1978, 10:34 PM PST (06:34 UTC), 12 km (8 mi) below the surface.
A larger quake followed: M1.9 11 km NE of Woodland, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.8 (md), micro
- Local time
- UTC
- 1978-03-03 06:34:09 UTC
- Depth
- 12.4 km (7.7 mi), shallow
- Epicenter
- 46.124° N, 122.441° W
- Region
- Washington
- 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.
- Location uncertainty
- About 1.9 km horizontally, 4.8 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- From location
- Station coverage gap
- 239°, poorly surrounded by stations
- Stations used
- 6
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 1.911 km NE of Woodland, Washington · 17735 days ago · 4 km deep · 22 km away
- 1.537 km S of Morton, Washington · 17700 days ago · 11 km deep · 23 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10845998. Read Tue, Sep 22, 2026, 10:51 AM UTC.