M1.7 earthquake 8 km SSW of Chelan Falls, Washington
A magnitude 1.7 earthquake struck 8 km SSW of Chelan Falls, Washington on Mon, May 23, 1977, 5:09 AM PDT (12:09 UTC), 3 km (2 mi) below the surface.
A larger quake followed: M2.3 7 km N of Quincy, 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), micro
- Local time
- UTC
- 1977-05-23 12:09:01 UTC
- Depth
- 3.0 km (1.9 mi), shallow
- Epicenter
- 47.729° N, 120.025° 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, 1.2 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- From location
- Station coverage gap
- 122°
- Stations used
- 7
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 7 in the 30 days before it.
After
- 1.712 km W of Entiat, Washington · 18023 days ago · 0 km deep · 27 km away
- 1.70 km SSW of Entiat, Washington · 18007 days ago · 0 km deep · 15 km away
- 2.37 km N of Quincy, Washington · 18000 days ago · 0 km deep · 49 km away
- 2.35 km NNE of Waterville, Washington · 17996 days ago · 0 km deep · 4 km away
- 1.70 km S of Royal City, Washington · 17973 days ago · 12 km deep · 97 km away
Before
- 1.510 km WSW of Entiat, Washington · 18032 days ago · 0 km deep · 25 km away
- 2.112 km SSW of Kittitas, Washington · 18036 days ago · 13 km deep · 100 km away
- 1.64 km NW of Waterville, Washington · 18037 days ago · 0 km deep · 10 km away
- 2.0Washington · 18040 days ago · 0 km deep · 14 km away
- 2.10 km SW of Waterville, Washington · 18042 days ago · 0 km deep · 10 km away
- 1.55 km SSW of Chelan Falls, Washington · 18043 days ago · 4 km deep · 3 km away
- 1.77 km SE of Rock Island, Washington · 18050 days ago · 0 km deep · 45 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10843743. Read Tue, Sep 29, 2026, 2:09 PM UTC.