M1.7 earthquake 10 km W of Twisp, Washington
A magnitude 1.7 earthquake struck 10 km W of Twisp, Washington on Sun, Aug 17, 2003, 8:16 AM PDT (15:16 UTC), -1 km (-1 mi) below the surface.
A larger quake followed: M2.9 37 km W 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
- 1.7 (Md, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 2003-08-17 15:16:46 UTC
- Depth
- -1.0 km (-0.6 mi), shallow
- Epicenter
- 48.357° N, 120.262° 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 1.9 km horizontally
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 222°, poorly surrounded by stations
- Stations used
- 11
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 4 in the 30 days before it.
After
- 1.75 km SSW of Entiat, Washington · 8439 days ago · -1 km deep · 80 km away
- 2.937 km W of Granite Falls, Washington · 8437 days ago · 5 km deep · 58 km away
- 1.936 km N of Leavenworth, Washington · 8436 days ago · 5 km deep · 58 km away
- 2.14 km W of Entiat, Washington · 8431 days ago · 4 km deep · 76 km away
- 1.952 km WNW of Granite Falls, Washington · 8427 days ago · -1 km deep · 56 km away
- 1.88 km SSE of Loomis, Washington · 8419 days ago · -1 km deep · 66 km away
- 1.818 km ESE of Darrington, Washington · 8416 days ago · 9 km deep · 84 km away
- 1.618 km ESE of Darrington, Washington · 8416 days ago · 7 km deep · 86 km away
- 2.010 km NNW of Marblemount, Washington · 8403 days ago · 0 km deep · 97 km away
Before
- 1.88 km WNW of Entiat, Washington · 8453 days ago · -1 km deep · 72 km away
- 1.59 km SSW of Chelan Falls, Washington · 8454 days ago · 4 km deep · 72 km away
- 1.64 km NNW of Tonasket, Washington · 8455 days ago · 0 km deep · 73 km away
- 1.57 km SSW of Malott, Washington · 8472 days ago · 0 km deep · 43 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10592013. Read Thu, Oct 1, 2026, 1:38 PM UTC.