M1.7 earthquake 0 km W of Lyman, Washington
A magnitude 1.7 earthquake struck 0 km W of Lyman, Washington on Sun, Apr 30, 1978, 12:16 PM PDT (19:16 UTC), -1 km (0 mi) below the surface.
A larger quake followed: M2.3 5 km SE of Anacortes, 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), micro
- Local time
- UTC
- 1978-04-30 19:16:10 UTC
- Depth
- -0.8 km (-0.5 mi), shallow
- Epicenter
- 48.528° N, 122.073° 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, 0.2 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- Operator assigned
- Station coverage gap
- 139°
- Stations used
- 5
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 4 in the 30 days before it.
After
- 2.35 km SE of Anacortes, Washington · 17672 days ago · 14 km deep · 37 km away
- 2.39 km SSW of Gold Bar, Washington · 17671 days ago · 3 km deep · 86 km away
- 1.82 km E of Sammamish, Washington · 17664 days ago · 11 km deep · 98 km away
- 1.83 km N of Woods Creek, Washington · 17661 days ago · 5 km deep · 70 km away
- 2.57 km ESE of Deming, Washington · 17660 days ago · 2 km deep · 31 km away
- 2.52 km ENE of Lake McMurray, Washington · 17657 days ago · 5 km deep · 24 km away
- 1.57 km WSW of Ault Field, Washington · 17651 days ago · 15 km deep · 57 km away
- 1.55 km SSE of Edison, Washington · 17641 days ago · 17 km deep · 24 km away
- 1.57 km E of Oak Bay, Canada · 17635 days ago · 47 km deep · 84 km away
- 1.58 km SSW of Gold Bar, Washington · 17635 days ago · 3 km deep · 85 km away
- 2.24 km N of La Conner, Washington · 17628 days ago · 24 km deep · 33 km away
Before
- 1.55 km SE of Hansville, Washington · 17682 days ago · 50 km deep · 77 km away
- 1.97 km NE of Acme, Washington · 17693 days ago · -1 km deep · 28 km away
- 1.67 km ESE of Deming, Washington · 17698 days ago · 8 km deep · 30 km away
- 1.510 km SSW of Index, Washington · 17703 days ago · 3 km deep · 94 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10846703. Read Tue, Sep 22, 2026, 7:13 AM UTC.