M1.5 earthquake 13 km ESE of Twisp, Washington
A magnitude 1.5 earthquake struck 13 km ESE of Twisp, Washington on Sat, May 23, 1987, 11:43 PM PDT (06:43 UTC), 2 km (1 mi) below the surface.
A larger quake followed: M1.7 1 km WSW of Entiat, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.5 (md), micro
- Local time
- UTC
- 1987-05-24 06:43:24 UTC
- Depth
- 2.2 km (1.4 mi), shallow
- Epicenter
- 48.304° N, 119.964° W
- Region
- Washington
- 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 0.1 km horizontally, 0.3 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- Operator assigned
- Station coverage gap
- 192°, poorly surrounded by stations
- 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: 4 in the 60 days after this one and 2 in the 30 days before it.
After
- 1.71 km WSW of Entiat, Washington · 14349 days ago · -1 km deep · 73 km away
- 1.932 km NNW of Leavenworth, Washington · 14343 days ago · 0 km deep · 78 km away
- 1.64 km NW of Entiat, Washington · 14343 days ago · 0 km deep · 69 km away
- 1.822 km ENE of Mansfield, Washington · 14307 days ago · 8 km deep · 64 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10221043. Read Wed, Sep 23, 2026, 5:19 AM UTC.