M1.5 earthquake 0 km SSW of Echo Lake, Washington
A magnitude 1.5 earthquake struck 0 km SSW of Echo Lake, Washington on Wed, Mar 18, 1987, 2:47 AM PST (10:47 UTC), 21 km (13 mi) below the surface.
A larger quake followed: M2.1 3 km SSW of Swede Heaven, 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), micro
- Local time
- UTC
- 1987-03-18 10:47:28 UTC
- Depth
- 20.9 km (13.0 mi), shallow
- Epicenter
- 47.781° N, 122.049° 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 0.3 km horizontally, 0.4 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- From location
- Station coverage gap
- 55°
- Stations used
- 21
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
- 2.13 km SSW of Swede Heaven, Washington · 14432 days ago · 3 km deep · 57 km away
- 2.27 km ENE of Lofall, Washington · 14423 days ago · 8 km deep · 40 km away
- 2.83 km SSW of Swede Heaven, Washington · 14416 days ago · 1 km deep · 57 km away
- 2.61 km NE of Riverton, Washington · 14413 days ago · 25 km deep · 36 km away
- 1.78 km NNE of Snoqualmie, Washington · 14413 days ago · 8 km deep · 29 km away
- 1.61 km NE of Riverton, Washington · 14411 days ago · 24 km deep · 36 km away
- 2.51 km NE of Riverton, Washington · 14405 days ago · 23 km deep · 37 km away
- 1.61 km NNW of Fall City, Washington · 14401 days ago · 8 km deep · 26 km away
- 1.520 km SSE of Marblemount, Washington · 14395 days ago · -1 km deep · 82 km away
- 2.83 km W of Chico, Washington · 14393 days ago · 20 km deep · 57 km away
- 2.11 km E of Algona, Washington · 14378 days ago · 12 km deep · 58 km away
Before
- 2.83 km SW of Swede Heaven, Washington · 14434 days ago · 3 km deep · 57 km away
- 1.61 km SSW of Mercer Island, Washington · 14440 days ago · 5 km deep · 28 km away
- 2.33 km S of Seattle, Washington · 14440 days ago · 12 km deep · 32 km away
- 1.84 km E of Brinnon, Washington · 14461 days ago · 14 km deep · 60 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10217423. Read Tue, Sep 22, 2026, 7:46 PM UTC.