M2.6 earthquake 10 km W of Mattawa, Washington
A magnitude 2.6 earthquake struck 10 km W of Mattawa, Washington on Fri, Apr 20, 1990, 3:16 AM PDT (10:16 UTC), 2 km (1 mi) below the surface.
A larger quake followed: M3.3 20 km SE of Desert Aire, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.6 (Md, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1990-04-20 10:16:36 UTC
- Depth
- 1.6 km (1.0 mi), shallow
- Epicenter
- 46.757° N, 120.044° 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 0.7 km horizontally, 0.9 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- From location
- Station coverage gap
- 56°
- Stations used
- 36
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 4 in the 30 days before it.
After
- 3.320 km SE of Desert Aire, Washington · 13312 days ago · 21 km deep · 33 km away
- 1.9Washington · 13304 days ago · 0 km deep · 41 km away
- 1.78 km E of Mesa, Washington · 13293 days ago · 4 km deep · 90 km away
- 2.215 km WSW of Ellensburg, Washington · 13280 days ago · 4 km deep · 55 km away
- 1.710 km WNW of Vantage, Washington · 13278 days ago · 2 km deep · 24 km away
- 1.711 km WSW of Basin City, Washington · 13276 days ago · 1 km deep · 62 km away
- 1.812 km WSW of Basin City, Washington · 13271 days ago · 4 km deep · 62 km away
- 1.714 km NNE of Selah, Washington · 13271 days ago · 16 km deep · 31 km away
- 2.815 km NNE of Naches, Washington · 13263 days ago · 7 km deep · 44 km away
- 1.6Washington · 13259 days ago · 7 km deep · 64 km away
Before
- 2.329 km SSW of White Swan, Washington · 13320 days ago · -1 km deep · 96 km away
- 1.829 km SSW of White Swan, Washington · 13320 days ago · 0 km deep · 96 km away
- 2.28 km NNE of Cashmere, Washington · 13340 days ago · 7 km deep · 97 km away
- 1.812 km SW of Entiat, Washington · 13341 days ago · 5 km deep · 98 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10260623. Read Fri, Oct 2, 2026, 2:44 AM UTC.