Washington earthquakes

M1.5 earthquake 51 km WSW of Twisp, Washington

A magnitude 1.5 earthquake struck 51 km WSW of Twisp, Washington on Tue, Nov 23, 1999, 8:56 PM PST (04:56 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.0 4 km S of Entiat, Washington. This one was a foreshock.

Twisp 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), micro
Local time
UTC
1999-11-24 04:56:39 UTC
Depth
6.5 km (4.0 mi), shallow
Epicenter
48.231° N, 120.789° 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 1.3 km horizontally, 1.3 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
175°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 1.93 km ENE of Monroe North, Washington · 9797 days ago · 16 km deep · 94 km away
  2. 1.96 km ENE of Entiat, Washington · 9791 days ago · 5 km deep · 78 km away
  3. 3.04 km S of Entiat, Washington · 9775 days ago · 6 km deep · 80 km away
  4. 1.510 km W of Entiat, Washington · 9771 days ago · -1 km deep · 69 km away
  5. 1.610 km W of Twisp, Washington · 9758 days ago · -1 km deep · 42 km away
  6. 2.12 km NW of Entiat, Washington · 9758 days ago · -1 km deep · 73 km away

Before

  1. 1.826 km NNE of Index, Washington · 9813 days ago · 5 km deep · 50 km away
  2. 2.52 km SW of Monroe North, Washington · 9814 days ago · 19 km deep · 99 km away
  3. 1.515 km NE of Twisp, Washington · 9826 days ago · -1 km deep · 66 km away
  4. 2.312 km E of Waterville, Washington · 9833 days ago · -1 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10487733. Read Wed, Sep 30, 2026, 6:12 AM UTC.