M1.8 earthquake 9 km E of Mansfield, Washington
A magnitude 1.8 earthquake struck 9 km E of Mansfield, Washington on Sun, Sep 19, 1999, 12:39 PM PDT (19:39 UTC), -1 km (0 mi) below the surface.
A larger quake followed: M2.8 8 km WSW 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, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1999-09-19 19:39:57 UTC
- Depth
- -0.8 km (-0.5 mi), shallow
- Epicenter
- 47.815° N, 119.504° 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 0.1 km horizontally, 0.4 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- Operator assigned
- Station coverage gap
- 174°
- Stations used
- 9
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 1 in the 30 days before it.
After
- 2.23 km S of Entiat, Washington · 9869 days ago · 0 km deep · 56 km away
- 2.88 km WSW of Entiat, Washington · 9845 days ago · 4 km deep · 64 km away
- 2.312 km E of Waterville, Washington · 9835 days ago · -1 km deep · 36 km away
- 1.515 km NE of Twisp, Washington · 9828 days ago · -1 km deep · 80 km away
- 2.59 km NE of Rock Island, Washington · 9827 days ago · -1 km deep · 59 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10484078. Read Fri, Oct 2, 2026, 6:27 AM UTC.