M1.5 earthquake 15 km ENE of Twisp, Washington
A magnitude 1.5 earthquake struck 15 km ENE of Twisp, Washington on Mon, Apr 15, 1991, 2:04 PM PDT (21:04 UTC), 0 km (0 mi) below the surface.
A larger quake followed: M3.1 55 km WNW of Granite Falls, 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, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1991-04-15 21:04:06 UTC
- Depth
- 0.1 km (0.1 mi), shallow
- Epicenter
- 48.430° N, 119.933° 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 0.9 km horizontally
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 284°, poorly surrounded by stations
- Stations used
- 7
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 4 in the 30 days before it.
After
- 3.155 km WNW of Granite Falls, Washington · 12943 days ago · -1 km deep · 79 km away
- 1.87 km NNE of Entiat, Washington · 12941 days ago · 0 km deep · 79 km away
- 2.456 km WNW of Granite Falls, Washington · 12936 days ago · 5 km deep · 76 km away
- 2.619 km NE of Osoyoos, Canada · 12931 days ago · -1 km deep · 95 km away
Before
- 3.94 km SE of Pateros, Washington · 12954 days ago · 11 km deep · 45 km away
- 1.68 km SSW of Chelan Falls, Washington · 12962 days ago · 3 km deep · 79 km away
- 2.713 km W of Mansfield, Washington · 12966 days ago · 0 km deep · 68 km away
- 3.38 km W of Entiat, Washington · 12972 days ago · -1 km deep · 88 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10273588. Read Fri, Oct 2, 2026, 7:24 AM UTC.