Washington earthquakes

M1.8 earthquake 1 km ENE of Vashon, Washington

A magnitude 1.8 earthquake struck 1 km ENE of Vashon, Washington on Sat, Oct 24, 1987, 5:05 PM PDT (00:05 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M1.9 1 km SW of Rocky Point, Washington. This one was a foreshock.

Vashon 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
1987-10-25 00:05:23 UTC
Depth
21.8 km (13.5 mi), shallow
Epicenter
47.456° N, 122.439° 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, 0.8 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
36°
Stations used
36

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 10 in the 30 days before it.

After

  1. 1.66 km E of Belfair, Washington · 14208 days ago · 19 km deep · 22 km away
  2. 1.87 km WSW of Wilderness Rim, Washington · 14205 days ago · 16 km deep · 45 km away
  3. 1.91 km SW of Rocky Point, Washington · 14203 days ago · 17 km deep · 23 km away
  4. 1.56 km ENE of Verlot, Washington · 14198 days ago · 14 km deep · 92 km away
  5. 2.210 km N of Quilcene, Washington · 14198 days ago · 19 km deep · 60 km away
  6. 1.54 km E of Port Ludlow, Washington · 14181 days ago · 16 km deep · 53 km away
  7. 1.83 km WSW of Shoreline, Washington · 14181 days ago · 14 km deep · 32 km away
  8. 2.115 km SW of Brinnon, Washington · 14165 days ago · 44 km deep · 48 km away
  9. 1.81 km SSW of Navy Yard City, Washington · 14164 days ago · 22 km deep · 20 km away

Before

  1. 2.025 km ENE of Ashford, Washington · 14219 days ago · -1 km deep · 85 km away
  2. 1.60 km SE of Lakeland South, Washington · 14222 days ago · 16 km deep · 24 km away
  3. 1.68 km NNE of Snoqualmie, Washington · 14224 days ago · 10 km deep · 52 km away
  4. 1.96 km SSE of Wilderness Rim, Washington · 14230 days ago · 1 km deep · 53 km away
  5. 1.98 km SSE of Sultan, Washington · 14231 days ago · 14 km deep · 63 km away
  6. 1.52 km ESE of Ames Lake, Washington · 14232 days ago · 22 km deep · 42 km away
  7. 2.16 km SSE of Wilderness Rim, Washington · 14232 days ago · 1 km deep · 53 km away
  8. 1.62 km W of Black Diamond, Washington · 14234 days ago · 13 km deep · 34 km away
  9. 1.87 km SSW of Quilcene, Washington · 14236 days ago · 47 km deep · 50 km away
  10. 2.15 km NE of Kingston, Washington · 14242 days ago · 16 km deep · 42 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10226593. Read Tue, Sep 22, 2026, 3:14 PM UTC.