M3.4 earthquake 7 km S of Loomis, Washington
A magnitude 3.4 earthquake struck 7 km S of Loomis, Washington on Fri, Dec 26, 2003, 2:07 AM PST (10:07 UTC), -1 km (0 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.4 (Md, duration), minor
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 2003-12-26 10:07:45 UTC
- Depth
- -0.6 km (-0.4 mi), shallow
- Epicenter
- 48.752° N, 119.634° W
- Region
- Washington
- Felt reports
- 22
- Strongest shaking
- IV, light shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 3.4 | Md, duration | Pacific Northwest Seismic Network | Preferred · Final · ±0.05 · 15 stations |
| 3.4 | Md, duration | USGS National Earthquake Information Center | Reviewed |
What happened
The USGS’s account of the effects of this earthquake.
Felt (III) at Loomis, Oroville and Tonasket.
From the USGS event page for uw10593233. U.S. Geological Survey text and figures are in the public domain.
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- IV, light shaking
- Map
- Automatic
Did you feel it?
22 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 0.3 km horizontally, 1.0 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- Operator assigned
- Station coverage gap
- 105°
- Stations used
- 26
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 1.5Washington · 8313 days ago · 7 km deep · 86 km away
- 1.714 km E of Twisp, Washington · 8284 days ago · 0 km deep · 50 km away
- 1.832 km NW of Conconully, Washington · 8281 days ago · -1 km deep · 32 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10593233 (also filed as usp000cg3s, uw12261007). Read Fri, Oct 2, 2026, 11:13 AM UTC.