Washington earthquakes

M1.7 earthquake 7 km SSW of Morton, Washington

A magnitude 1.7 earthquake struck 7 km SSW of Morton, Washington on Sat, Oct 30, 1999, 11:32 PM PDT (06:32 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M2.2 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
1.7 (md), micro
Local time
UTC
1999-10-31 06:32:18 UTC
Depth
17.7 km (11.0 mi), shallow
Epicenter
46.500° N, 122.325° 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 0.4 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
42°
Stations used
48

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 1.714 km NNE of Ashford, Washington · 9830 days ago · 9 km deep · 51 km away
  2. 2.06 km SSE of Vashon, Washington · 9802 days ago · 18 km deep · 100 km away
  3. 1.621 km S of Morton, Washington · 9799 days ago · 7 km deep · 16 km away
  4. 2.113 km W of Greenwater, Washington · 9794 days ago · 14 km deep · 83 km away
  5. 1.67 km N of Amboy, Washington · 9784 days ago · 15 km deep · 59 km away
  6. 2.2Washington · 9781 days ago · 17 km deep · 81 km away
  7. 1.6Washington-Oregon border region · 9780 days ago · 8 km deep · 70 km away
  8. 1.92 km NNE of Bonney Lake, Washington · 9779 days ago · 14 km deep · 78 km away
  9. 1.6Washington · 9777 days ago · 1 km deep · 57 km away
  10. 2.019 km NNE of Ashford, Washington · 9776 days ago · 12 km deep · 55 km away
  11. 1.837 km SSE of Morton, Washington · 9776 days ago · 11 km deep · 34 km away
  12. 1.614 km SSE of Carbonado, Washington · 9775 days ago · 12 km deep · 58 km away

Before

  1. 1.51 km WNW of Lea Hill, Washington · 9838 days ago · 63 km deep · 93 km away
  2. 2.435 km SSE of Morton, Washington · 9840 days ago · -2 km deep · 30 km away
  3. 1.66 km WSW of Kalama, Washington · 9843 days ago · 6 km deep · 73 km away
  4. 1.721 km ENE of Ashford, Washington · 9847 days ago · 0 km deep · 57 km away
  5. 2.120 km ENE of Ashford, Washington · 9851 days ago · -2 km deep · 56 km away
  6. 2.512 km WSW of Packwood, Washington · 9859 days ago · 3 km deep · 39 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10491218. Read Wed, Sep 30, 2026, 10:54 AM UTC.