Washington earthquakes

M1.8 earthquake 11 km SSE of Mineral, Washington

A magnitude 1.8 earthquake struck 11 km SSE of Mineral, Washington on Mon, Aug 18, 2003, 9:28 PM PDT (04:28 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M2.0 24 km E of Castle Rock, 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, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
2003-08-19 04:28:03 UTC
Depth
14.6 km (9.1 mi), shallow
Epicenter
46.620° N, 122.128° 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
±0.04
Depth from
From location
Station coverage gap
42°
Stations used
31

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. 1.512 km WSW of Greenwater, Washington · 8439 days ago · 5 km deep · 62 km away
  2. 1.615 km S of Morton, Washington · 8433 days ago · 7 km deep · 24 km away
  3. 1.73 km ESE of Trout Lake, Washington · 8429 days ago · -1 km deep · 86 km away
  4. 1.538 km NNE of Amboy, Washington · 8422 days ago · 0 km deep · 47 km away
  5. 1.54 km SSE of La Center, Washington · 8420 days ago · 9 km deep · 97 km away
  6. 1.5Washington · 8412 days ago · 18 km deep · 22 km away
  7. 1.91 km WSW of Maple Valley, Washington · 8401 days ago · 8 km deep · 86 km away
  8. 1.61 km WNW of Maple Valley, Washington · 8400 days ago · 6 km deep · 86 km away
  9. 2.024 km E of Castle Rock, Washington · 8399 days ago · 18 km deep · 56 km away
  10. 1.61 km NNW of Gig Harbor, Washington · 8399 days ago · 29 km deep · 88 km away
  11. 1.727 km SW of White Swan, Washington · 8398 days ago · -1 km deep · 98 km away
  12. 1.710 km SSE of Mineral, Washington · 8395 days ago · 16 km deep · 1 km away
  13. 1.81 km NW of Maple Valley, Washington · 8395 days ago · 11 km deep · 87 km away
  14. 1.50 km ENE of Maple Valley, Washington · 8395 days ago · 9 km deep · 87 km away
  15. 1.65 km WSW of Deer Island, Oregon · 8388 days ago · 22 km deep · 99 km away
  16. 1.510 km ESE of Riverbend, Washington · 8386 days ago · 12 km deep · 97 km away

Before

  1. 1.823 km ENE of Ashford, Washington · 8449 days ago · -2 km deep · 39 km away
  2. 2.28 km S of Morton, Washington · 8452 days ago · 17 km deep · 19 km away
  3. 1.710 km E of Kalama, Washington · 8458 days ago · 13 km deep · 81 km away
  4. 2.110 km E of Kalama, Washington · 8466 days ago · 19 km deep · 83 km away
  5. 2.130 km ESE of Packwood, Washington · 8471 days ago · 0 km deep · 64 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10592208. Read Thu, Oct 1, 2026, 6:09 PM UTC.