M1.8 earthquake 15 km SE of Prosser, Washington
A magnitude 1.8 earthquake struck 15 km SE of Prosser, Washington on Wed, Sep 5, 1990, 5:40 PM PDT (00:40 UTC), 8 km (5 mi) below the surface.
A larger quake followed: M2.4 1 km SSW of Finley, 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
- 1990-09-06 00:40:51 UTC
- Depth
- 8.4 km (5.2 mi), shallow
- Epicenter
- 46.095° N, 119.653° 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 0.9 km horizontally, 1.5 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- From location
- Station coverage gap
- 118°
- Stations used
- 18
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 2 in the 30 days before it.
After
- 2.114 km SSE of Prosser, Washington · 13175 days ago · 8 km deep · 1 km away
- 1.54 km WSW of Benton City, Washington · 13168 days ago · 7 km deep · 19 km away
- 1.915 km SE of Prosser, Washington · 13157 days ago · 7 km deep · 0 km away
- 1.520 km SSE of Royal City, Washington · 13122 days ago · 16 km deep · 73 km away
- 2.41 km SSW of Finley, Washington · 13120 days ago · 12 km deep · 48 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10261388. Read Fri, Oct 2, 2026, 4:07 PM UTC.