Washington earthquakes

M1.5 earthquake 41 km SSE of Morton, Washington

A magnitude 1.5 earthquake struck 41 km SSE of Morton, Washington on Mon, May 9, 1988, 9:59 AM PDT (16:59 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M2.5 8 km NNE of Government Camp, Oregon. 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
1.5 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1988-05-09 16:59:17 UTC
Depth
0.3 km (0.2 mi), shallow
Epicenter
46.240° N, 121.989° 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 0.2 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
68°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 1.519 km SSE of Carbonado, Washington · 14021 days ago · 11 km deep · 76 km away
  2. 2.58 km NNE of Government Camp, Oregon · 14019 days ago · 5 km deep · 99 km away
  3. 1.537 km NNE of Amboy, Washington · 14014 days ago · -2 km deep · 17 km away
  4. 1.58 km WNW of North Portland, Oregon · 14014 days ago · 17 km deep · 91 km away
  5. 1.733 km SE of Morton, Washington · 14012 days ago · -1 km deep · 9 km away
  6. 1.610 km SSE of Mossyrock, Washington · 14012 days ago · 17 km deep · 42 km away
  7. 1.511 km S of Greenwater, Washington · 14006 days ago · 0 km deep · 94 km away
  8. 1.93 km W of Ryderwood, Washington · 14001 days ago · 52 km deep · 86 km away
  9. 1.78 km E of Yacolt, Washington · 13996 days ago · 5 km deep · 49 km away
  10. 2.34 km E of Tampico, Washington · 13992 days ago · 0 km deep · 96 km away
  11. 1.812 km NE of Packwood, Washington · 13989 days ago · 1 km deep · 60 km away
  12. 1.712 km ESE of Ashford, Washington · 13984 days ago · 5 km deep · 56 km away
  13. 1.812 km SW of Packwood, Washington · 13976 days ago · 5 km deep · 36 km away
  14. 1.8Washington-Oregon border region · 13965 days ago · 8 km deep · 61 km away

Before

  1. 1.818 km SSW of White Swan, Washington · 14026 days ago · -1 km deep · 90 km away
  2. 1.922 km S of Morton, Washington · 14031 days ago · 10 km deep · 24 km away
  3. 1.524 km ENE of Ashford, Washington · 14031 days ago · -1 km deep · 71 km away
  4. 1.638 km NNE of Amboy, Washington · 14033 days ago · 3 km deep · 16 km away
  5. 1.738 km NNE of Amboy, Washington · 14035 days ago · 3 km deep · 16 km away
  6. 1.89 km S of Morton, Washington · 14039 days ago · 7 km deep · 35 km away
  7. 3.024 km ENE of Yacolt, Washington · 14052 days ago · 3 km deep · 33 km away
  8. 1.823 km ENE of Yacolt, Washington · 14052 days ago · 5 km deep · 34 km away
  9. 1.723 km ENE of Yacolt, Washington · 14052 days ago · 5 km deep · 34 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10230268. Read Fri, Oct 2, 2026, 6:37 AM UTC.