M1.5 earthquake 4 km N of Waterville, Washington
A magnitude 1.5 earthquake struck 4 km N of Waterville, Washington on Mon, Sep 21, 1987, 5:27 PM PDT (00:27 UTC), 2 km (1 mi) below the surface.
A larger quake followed: M2.0 9 km SSW of Chelan Falls, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.5 (md), micro
- Local time
- UTC
- 1987-09-22 00:27:51 UTC
- Depth
- 1.7 km (1.0 mi), shallow
- Epicenter
- 47.690° N, 120.079° 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 0.8 km horizontally, 3.0 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- From location
- Station coverage gap
- 92°
- Stations used
- 10
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 4 in the 30 days before it.
After
- 1.513 km NE of Cliffdell, Washington · 14243 days ago · -1 km deep · 98 km away
- 2.09 km SSW of Chelan Falls, Washington · 14240 days ago · 2 km deep · 5 km away
- 2.041 km W of Winthrop, Washington · 14240 days ago · 4 km deep · 94 km away
- 2.112 km SSE of Okanogan, Washington · 14239 days ago · -1 km deep · 76 km away
- 1.516 km NNW of Vantage, Washington · 14235 days ago · 0 km deep · 68 km away
- 2.616 km NNW of Vantage, Washington · 14231 days ago · 0 km deep · 69 km away
- 1.917 km E of Mansfield, Washington · 14219 days ago · -1 km deep · 52 km away
- 1.56 km NW of Entiat, Washington · 14213 days ago · 0 km deep · 14 km away
- 2.05 km WNW of Quincy, Washington · 14203 days ago · 5 km deep · 50 km away
- 1.632 km SE of Darrington, Washington · 14201 days ago · 14 km deep · 98 km away
- 2.055 km ESE of Darrington, Washington · 14201 days ago · 0 km deep · 78 km away
Before
- 1.75 km NNE of Entiat, Washington · 14251 days ago · -1 km deep · 8 km away
- 1.736 km NE of Skykomish, Washington · 14264 days ago · 0 km deep · 77 km away
- 2.136 km NE of Skykomish, Washington · 14264 days ago · 0 km deep · 77 km away
- 2.27 km SSE of Okanogan, Washington · 14270 days ago · 0 km deep · 79 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10225268. Read Tue, Sep 22, 2026, 6:34 AM UTC.