Washington earthquakes

M1.8 earthquake 9 km S of Morton, Washington

A magnitude 1.8 earthquake struck 9 km S of Morton, Washington on Sun, Apr 24, 1988, 12:15 PM PDT (19:15 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M1.9 22 km S of Morton, 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.

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The earthquake

Magnitude
1.8 (md), micro
Local time
UTC
1988-04-24 19:15:37 UTC
Depth
6.7 km (4.2 mi), shallow
Epicenter
46.477° N, 122.290° 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
±0.06
Depth from
From location
Station coverage gap
74°
Stations used
23

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 16 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 1.738 km NNE of Amboy, Washington · 14026 days ago · 3 km deep · 31 km away
  2. 1.638 km NNE of Amboy, Washington · 14023 days ago · 3 km deep · 32 km away
  3. 1.524 km ENE of Ashford, Washington · 14022 days ago · -1 km deep · 60 km away
  4. 1.922 km S of Morton, Washington · 14021 days ago · 10 km deep · 14 km away
  5. 1.541 km SSE of Morton, Washington · 14015 days ago · 0 km deep · 35 km away
  6. 1.519 km SSE of Carbonado, Washington · 14012 days ago · 11 km deep · 56 km away
  7. 1.537 km NNE of Amboy, Washington · 14005 days ago · -2 km deep · 32 km away
  8. 1.58 km WNW of North Portland, Oregon · 14004 days ago · 17 km deep · 100 km away
  9. 1.733 km SE of Morton, Washington · 14003 days ago · -1 km deep · 28 km away
  10. 1.610 km SSE of Mossyrock, Washington · 14003 days ago · 17 km deep · 13 km away
  11. 2.52 km WSW of Artondale, Washington · 13998 days ago · 21 km deep · 95 km away
  12. 1.511 km S of Greenwater, Washington · 13997 days ago · 0 km deep · 81 km away
  13. 1.93 km W of Ryderwood, Washington · 13991 days ago · 52 km deep · 62 km away
  14. 1.78 km E of Yacolt, Washington · 13987 days ago · 5 km deep · 69 km away
  15. 1.812 km NE of Packwood, Washington · 13980 days ago · 1 km deep · 60 km away
  16. 1.712 km ESE of Ashford, Washington · 13975 days ago · 5 km deep · 43 km away

Before

  1. 3.024 km ENE of Yacolt, Washington · 14043 days ago · 3 km deep · 59 km away
  2. 1.823 km ENE of Yacolt, Washington · 14043 days ago · 5 km deep · 60 km away
  3. 1.723 km ENE of Yacolt, Washington · 14043 days ago · 5 km deep · 60 km away
  4. 1.55 km SW of Packwood, Washington · 14051 days ago · 8 km deep · 45 km away
  5. 1.938 km NE of Amboy, Washington · 14053 days ago · 8 km deep · 33 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10231173. Read Tue, Sep 22, 2026, 10:27 PM UTC.