M1.8 earthquake 15 km NE of Bridgeport, Washington
A magnitude 1.8 earthquake struck 15 km NE of Bridgeport, Washington on Tue, Mar 21, 1978, 7:27 PM PST (03:27 UTC), 11 km (7 mi) below the surface.
A larger quake followed: M3.3 7 km NNW of Entiat, 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
- 1978-03-22 03:27:07 UTC
- Depth
- 11.0 km (6.9 mi), shallow
- Epicenter
- 48.091° N, 119.502° 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 0.8 km horizontally, 1.8 km in depth
- Magnitude uncertainty
- ±0.06
- Depth from
- From location
- Station coverage gap
- 210°, poorly surrounded by stations
- Stations used
- 10
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 5 in the 30 days before it.
After
- 1.710 km ENE of Conconully, Washington · 17705 days ago · 17 km deep · 56 km away
- 1.610 km W of Entiat, Washington · 17695 days ago · 0 km deep · 78 km away
- 3.37 km NNW of Entiat, Washington · 17691 days ago · 4 km deep · 68 km away
Before
- 3.317 km NE of Bridgeport, Washington · 17716 days ago · 12 km deep · 2 km away
- 1.66 km NE of Waterville, Washington · 17722 days ago · 2 km deep · 59 km away
- 1.92 km SSW of Entiat, Washington · 17724 days ago · 4 km deep · 73 km away
- 1.911 km NNW of Entiat, Washington · 17740 days ago · 5 km deep · 65 km away
- 1.82 km S of Entiat, Washington · 17740 days ago · 3 km deep · 72 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10846248. Read Tue, Sep 22, 2026, 9:11 AM UTC.