Washington earthquakes

M1.7 earthquake 12 km S of Morton, Washington

A magnitude 1.7 earthquake struck 12 km S of Morton, Washington on Tue, Jul 21, 1987, 6:03 AM PDT (13:03 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.1 23 km ENE of Ashford, Washington. This one was a foreshock.

Morton forecastMore in Washington

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
1.7 (md), micro
Local time
UTC
1987-07-21 13:03:30 UTC
Depth
6.4 km (4.0 mi), shallow
Epicenter
46.446° N, 122.249° W
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, 0.5 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
62°
Stations used
20

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 1.625 km ENE of Ashford, Washington · 14304 days ago · 0 km deep · 61 km away
  2. 1.635 km NNE of Amboy, Washington · 14287 days ago · -2 km deep · 29 km away
  3. 2.123 km ENE of Ashford, Washington · 14263 days ago · 1 km deep · 59 km away
  4. 1.822 km S of Morton, Washington · 14256 days ago · 12 km deep · 10 km away
  5. 1.722 km S of Morton, Washington · 14256 days ago · 11 km deep · 10 km away
  6. 2.822 km S of Morton, Washington · 14256 days ago · 11 km deep · 10 km away
  7. 1.622 km S of Morton, Washington · 14255 days ago · 12 km deep · 10 km away
  8. 2.616 km WSW of Alder, Washington · 14254 days ago · 18 km deep · 35 km away
  9. 1.53 km W of Deer Island, Oregon · 14252 days ago · 23 km deep · 75 km away

Before

  1. 1.917 km ENE of Packwood, Washington · 14312 days ago · 8 km deep · 65 km away
  2. 1.923 km ENE of Ashford, Washington · 14317 days ago · -1 km deep · 59 km away
  3. 1.823 km ENE of Ashford, Washington · 14325 days ago · 2 km deep · 59 km away
  4. 1.838 km NNE of Amboy, Washington · 14329 days ago · -2 km deep · 27 km away
  5. 2.137 km NNE of Amboy, Washington · 14332 days ago · -2 km deep · 28 km away
  6. 2.011 km ENE of Kalama, WA · 14333 days ago · 16 km deep · 57 km away

Earthquakes todayWashington earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10221938. Read Tue, Sep 22, 2026, 4:24 PM UTC.