M1.6 earthquake 10 km W of Entiat, Washington
A magnitude 1.6 earthquake struck 10 km W of Entiat, Washington on Wed, Apr 12, 1978, 5:02 AM PST (13:02 UTC), 0 km (0 mi) below the surface.
A larger quake followed: M1.8 8 km WNW of Cascade Valley, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.6 (md), micro
- Local time
- UTC
- 1978-04-12 13:02:18 UTC
- Depth
- 0.4 km (0.2 mi), shallow
- Epicenter
- 47.668° N, 120.343° 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 0.0 km horizontally, 0.1 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- Operator assigned
- Station coverage gap
- 156°
- Stations used
- 8
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 6 in the 30 days before it.
After
- 1.88 km WNW of Cascade Valley, Washington · 17695 days ago · 15 km deep · 89 km away
- 3.37 km NNW of Entiat, Washington · 17691 days ago · 4 km deep · 11 km away
- 1.72 km SE of Entiat, Washington · 17649 days ago · 4 km deep · 12 km away
- 1.69 km NNE of Waterville, Washington · 17641 days ago · 5 km deep · 25 km away
Before
- 1.711 km S of Ellensburg, Washington · 17703 days ago · 23 km deep · 87 km away
- 1.510 km SSW of Index, Washington · 17703 days ago · 3 km deep · 96 km away
- 1.815 km NE of Bridgeport, Washington · 17716 days ago · 11 km deep · 78 km away
- 3.317 km NE of Bridgeport, Washington · 17716 days ago · 12 km deep · 80 km away
- 1.66 km NE of Waterville, Washington · 17722 days ago · 2 km deep · 24 km away
- 1.92 km SSW of Entiat, Washington · 17724 days ago · 4 km deep · 9 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10846523. Read Tue, Sep 22, 2026, 7:44 AM UTC.