M1.7 earthquake 1 km ENE of Entiat, Washington
A magnitude 1.7 earthquake struck 1 km ENE of Entiat, Washington on Sat, Mar 21, 1987, 3:39 AM PST (11:39 UTC), 4 km (2 mi) below the surface.
A larger quake followed: M2.4 7 km NE of Royal City, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.7 (Md, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1987-03-21 11:39:58 UTC
- Depth
- 3.7 km (2.3 mi), shallow
- Epicenter
- 47.680° N, 120.194° 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 0.3 km horizontally, 0.8 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- From location
- Station coverage gap
- 69°
- Stations used
- 14
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 4 in the 30 days before it.
After
- 1.92 km WSW of Chelan, Washington · 14428 days ago · -1 km deep · 20 km away
- 2.47 km NE of Royal City, Washington · 14426 days ago · 1 km deep · 94 km away
- 2.023 km SW of Vantage, Washington · 14418 days ago · 3 km deep · 98 km away
- 1.81 km WNW of Waterville, Washington · 14401 days ago · 5 km deep · 8 km away
- 2.17 km NE of Royal City, Washington · 14383 days ago · 1 km deep · 95 km away
- 1.73 km WSW of Chelan, Washington · 14382 days ago · -1 km deep · 20 km away
Before
- 1.55 km WSW of Entiat, Washington · 14442 days ago · 4 km deep · 6 km away
- 1.65 km SW of Entiat, Washington · 14449 days ago · 3 km deep · 7 km away
- 1.523 km SSE of Kittitas, Washington · 14457 days ago · 7 km deep · 98 km away
- 2.62 km WSW of Chelan, Washington · 14460 days ago · -1 km deep · 20 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10217853. Read Thu, Oct 1, 2026, 11:52 AM UTC.