M1.8 earthquake 6 km W of Entiat, Washington
A magnitude 1.8 earthquake struck 6 km W of Entiat, Washington on Sat, Aug 18, 1990, 12:20 PM PDT (19:20 UTC), -1 km (-1 mi) below the surface.
A larger quake followed: M2.6 21 km ESE of Darrington, 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, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1990-08-18 19:20:13 UTC
- Depth
- -1.1 km (-0.7 mi), shallow
- Epicenter
- 47.677° N, 120.292° 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 0.2 km horizontally, 0.5 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- Operator assigned
- Station coverage gap
- 97°
- Stations used
- 15
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 7 in the 30 days before it.
After
- 1.517 km SSW of Skykomish, Washington · 13185 days ago · 95 km deep · 90 km away
- 1.61 km ESE of Entiat, Washington · 13183 days ago · -1 km deep · 8 km away
- 1.935 km WSW of Twisp, Washington · 13152 days ago · 6 km deep · 65 km away
- 1.63 km N of Waterville, Washington · 13151 days ago · 5 km deep · 16 km away
- 2.621 km ESE of Darrington, Washington · 13148 days ago · 0 km deep · 97 km away
- 1.640 km WNW of Granite Falls, Washington · 13135 days ago · 7 km deep · 52 km away
Before
- 1.512 km NNE of Naches, Washington · 13199 days ago · 13 km deep · 97 km away
- 1.910 km WNW of Vantage, Washington · 13203 days ago · 3 km deep · 80 km away
- 1.7Washington · 13203 days ago · 10 km deep · 71 km away
- 1.539 km WNW of Granite Falls, Washington · 13210 days ago · 6 km deep · 50 km away
- 1.73 km N of Entiat, Washington · 13210 days ago · 2 km deep · 7 km away
- 1.715 km ENE of Skykomish, Washington · 13211 days ago · 1 km deep · 65 km away
- 1.615 km SSW of Ellensburg, Washington · 13216 days ago · 7 km deep · 94 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10264783. Read Fri, Oct 2, 2026, 3:20 AM UTC.