M2.1 earthquake Washington
A magnitude 2.1 earthquake struck in Washington on Sun, Oct 23, 1977, 2:22 AM PDT (09:22 UTC), 0 km (0 mi) below the surface.
A larger quake followed: M2.7 5 km ESE of Okanogan, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.1 (md), micro
- Local time
- UTC
- 1977-10-23 09:22:18 UTC
- Depth
- -0.2 km (-0.1 mi), shallow
- Epicenter
- 48.421° N, 120.209° 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 0.6 km horizontally
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 128°
- Stations used
- 12
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 4 in the 30 days before it.
After
- 2.75 km ESE of Okanogan, Washington · 17841 days ago · 15 km deep · 52 km away
- 2.18 km W of Entiat, Washington · 17808 days ago · 5 km deep · 83 km away
Before
- 1.74 km NNE of Entiat, Washington · 17868 days ago · 2 km deep · 79 km away
- 1.86 km WNW of Entiat, Washington · 17874 days ago · 0 km deep · 82 km away
- 1.519 km NNW of Banks Lake South, Washington · 17880 days ago · 0 km deep · 94 km away
- 1.66 km W of Entiat, Washington · 17882 days ago · 0 km deep · 84 km away
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10845008. Read Wed, Sep 23, 2026, 8:39 PM UTC.