M1.6 earthquake 10 km NNE of Snoqualmie, Washington
A magnitude 1.6 earthquake struck 10 km NNE of Snoqualmie, Washington on Tue, Sep 12, 1978, 3:03 PM PDT (22:03 UTC), -1 km (-1 mi) below the surface.
A larger quake followed: M2.1 1 km NW of Federal Way, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.6 (md), micro
- Local time
- UTC
- 1978-09-12 22:03:11 UTC
- Depth
- -0.9 km (-0.6 mi), shallow
- Epicenter
- 47.614° N, 121.760° 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, 0.1 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- Operator assigned
- Station coverage gap
- 184°, 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: 7 in the 60 days after this one and 4 in the 30 days before it.
After
- 2.11 km NW of Federal Way, Washington · 17547 days ago · 14 km deep · 53 km away
- 1.510 km NE of Ashford, Washington · 17523 days ago · 8 km deep · 89 km away
- 1.98 km ESE of Kapowsin, Washington · 17517 days ago · 1 km deep · 78 km away
- 1.62 km ENE of Dash Point, Washington · 17516 days ago · 24 km deep · 58 km away
- 1.61 km WSW of Auburn, Washington · 17516 days ago · 10 km deep · 50 km away
- 1.94 km WSW of Coupeville, Washington · 17500 days ago · 21 km deep · 99 km away
- 1.53 km NW of Bryant, Washington · 17499 days ago · 11 km deep · 78 km away
Before
- 1.96 km W of Burley, Washington · 17557 days ago · 22 km deep · 74 km away
- 2.16 km N of Kingston, Washington · 17560 days ago · 14 km deep · 61 km away
- 3.27 km SW of Brinnon, Washington · 17566 days ago · 46 km deep · 90 km away
- 2.310 km S of Baring, Washington · 17577 days ago · 11 km deep · 21 km away
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10847878. Read Thu, Oct 1, 2026, 2:01 AM UTC.