Washington earthquakes

M2.4 earthquake 7 km S of Longbranch, Washington

A magnitude 2.4 earthquake struck 7 km S of Longbranch, Washington on Tue, Apr 23, 1991, 9:44 PM PDT (04:44 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M3.0 10 km E of Ashford, Washington. This one was a foreshock.

Longbranch 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
2.4 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-04-24 04:44:09 UTC
Depth
22.1 km (13.7 mi), shallow
Epicenter
47.142° N, 122.774° 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
±0.04
Depth from
From location
Station coverage gap
35°
Stations used
40

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 11 in the 30 days before it.

After

  1. 1.514 km E of Wilkeson, Washington · 12937 days ago · 7 km deep · 70 km away
  2. 1.614 km E of Wilkeson, Washington · 12937 days ago · 7 km deep · 69 km away
  3. 2.01 km SSE of Normandy Park, WA · 12935 days ago · 13 km deep · 46 km away
  4. 2.123 km NE of Ashford, Washington · 12929 days ago · -1 km deep · 79 km away
  5. 3.010 km E of Ashford, Washington · 12924 days ago · 10 km deep · 79 km away
  6. 1.75 km ESE of Carbonado, Washington · 12915 days ago · 10 km deep · 61 km away
  7. 2.08 km NE of Snoqualmie, Washington · 12914 days ago · 1 km deep · 92 km away
  8. 1.87 km NE of Fall City, Washington · 12908 days ago · 2 km deep · 89 km away
  9. 2.33 km SW of McCleary, Washington · 12907 days ago · 39 km deep · 42 km away
  10. 1.74 km ENE of Port Ludlow, Washington · 12907 days ago · 14 km deep · 90 km away
  11. 2.26 km ENE of Amanda Park, Washington · 12904 days ago · 33 km deep · 88 km away
  12. 1.74 km WNW of Hunts Point, Washington · 12902 days ago · 52 km deep · 68 km away
  13. 1.64 km ENE of Lake Morton-Berrydale, Washington · 12892 days ago · 14 km deep · 59 km away
  14. 2.05 km SSE of Port Ludlow, Washington · 12891 days ago · 18 km deep · 83 km away
  15. 2.122 km SSE of Greenwater, Washington · 12887 days ago · 10 km deep · 94 km away
  16. 2.623 km ENE of Ashford, Washington · 12887 days ago · -2 km deep · 82 km away

Before

  1. 1.57 km W of Allyn, Washington · 12952 days ago · 14 km deep · 31 km away
  2. 2.32 km SSW of West Lake Sammamish, Washington · 12958 days ago · 12 km deep · 68 km away
  3. 1.520 km NNW of Packwood, Washington · 12960 days ago · -1 km deep · 88 km away
  4. 2.013 km SSW of Alder, Washington · 12960 days ago · 16 km deep · 60 km away
  5. 1.522 km ENE of Ashford, Washington · 12964 days ago · -1 km deep · 83 km away
  6. 2.05 km SSW of Clinton, Washington · 12965 days ago · 23 km deep · 93 km away
  7. 1.62 km SW of Roosevelt, Washington · 12969 days ago · 16 km deep · 98 km away
  8. 1.922 km ENE of Ashford, Washington · 12969 days ago · -2 km deep · 83 km away
  9. 2.78 km WSW of Amanda Park, Washington · 12969 days ago · 25 km deep · 98 km away
  10. 1.722 km ENE of Ashford, Washington · 12969 days ago · -2 km deep · 83 km away
  11. 2.324 km S of Morton, Washington · 12970 days ago · 11 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10274358. Read Fri, Oct 2, 2026, 5:51 PM UTC.