M1.6 earthquake 9 km N of Naches, Washington
A magnitude 1.6 earthquake struck 9 km N of Naches, Washington on Tue, Jul 21, 1987, 1:34 PM PDT (20:34 UTC), 9 km (6 mi) below the surface.
A larger quake followed: M2.2 4 km SW 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
- 1.6 (md), micro
- Local time
- UTC
- 1987-07-21 20:34:09 UTC
- Depth
- 8.9 km (5.5 mi), shallow
- Epicenter
- 46.819° N, 120.699° 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, 0.9 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- From location
- Station coverage gap
- 90°
- Stations used
- 12
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 6 in the 30 days before it.
After
- 1.625 km ENE of Ashford, Washington · 14304 days ago · 0 km deep · 78 km away
- 1.66 km WSW of Easton, Washington · 14293 days ago · 20 km deep · 61 km away
- 2.24 km SW of Entiat, Washington · 14290 days ago · -1 km deep · 98 km away
- 2.06 km NE of Thorp, Washington · 14277 days ago · 8 km deep · 34 km away
- 2.218 km ESE of Royal City, Washington · 14272 days ago · 0 km deep · 96 km away
- 1.917 km ESE of Royal City, Washington · 14271 days ago · 0 km deep · 96 km away
- 1.614 km NNW of Tampico, Washington · 14270 days ago · 5 km deep · 28 km away
- 2.123 km ENE of Ashford, Washington · 14263 days ago · 1 km deep · 81 km away
Before
- 2.37 km N of Naches, Washington · 14309 days ago · 11 km deep · 2 km away
- 1.917 km ENE of Packwood, Washington · 14312 days ago · 8 km deep · 61 km away
- 2.12 km W of Kittitas, Washington · 14313 days ago · 11 km deep · 26 km away
- 1.923 km ENE of Ashford, Washington · 14317 days ago · -1 km deep · 80 km away
- 1.823 km ENE of Ashford, Washington · 14325 days ago · 2 km deep · 81 km away
- 1.520 km NE of Terrace Heights, Washington · 14330 days ago · 3 km deep · 34 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10222048. Read Tue, Sep 22, 2026, 4:22 PM UTC.