M1.7 earthquake 10 km NW of Marblemount, Washington
A magnitude 1.7 earthquake struck 10 km NW of Marblemount, Washington on Wed, Sep 9, 1987, 8:34 AM PDT (15:34 UTC), -1 km (0 mi) below the surface.
A larger quake followed: M1.8 16 km SE of Glacier, 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
- 1987-09-09 15:34:40 UTC
- Depth
- -0.6 km (-0.4 mi), shallow
- Epicenter
- 48.606° N, 121.536° 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 4.5 km horizontally, 15.4 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- Operator assigned
- Station coverage gap
- 242°, poorly surrounded by stations
- Stations used
- 9
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 6 in the 30 days before it.
After
- 1.79 km NNW of Marblemount, Washington · 14257 days ago · 0 km deep · 1 km away
- 1.816 km SE of Glacier, Washington · 14254 days ago · 25 km deep · 27 km away
- 2.041 km W of Winthrop, Washington · 14240 days ago · 4 km deep · 62 km away
- 1.98 km SSE of Sultan, Washington · 14231 days ago · 14 km deep · 92 km away
- 1.713 km WNW of Chilliwack, Canada · 14208 days ago · -1 km deep · 79 km away
- 1.99 km NNW of Ault Field, Washington · 14207 days ago · 52 km deep · 90 km away
- 1.632 km SE of Darrington, Washington · 14201 days ago · 14 km deep · 63 km away
- 2.055 km ESE of Darrington, Washington · 14201 days ago · 0 km deep · 71 km away
- 2.41 km E of Ferndale, Washington · 14199 days ago · 18 km deep · 80 km away
- 1.56 km ENE of Verlot, Washington · 14198 days ago · 14 km deep · 56 km away
Before
- 1.736 km NE of Skykomish, Washington · 14265 days ago · 0 km deep · 82 km away
- 2.136 km NE of Skykomish, Washington · 14265 days ago · 0 km deep · 82 km away
- 1.96 km SSE of Concrete, Washington · 14269 days ago · 2 km deep · 18 km away
- 2.02 km WSW of Birch Bay, Washington · 14270 days ago · 15 km deep · 97 km away
- 2.457 km SE of Hope, Canada · 14271 days ago · 34 km deep · 59 km away
- 1.72 km SSW of Birch Bay, Washington · 14277 days ago · 13 km deep · 95 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10222618. Read Tue, Sep 22, 2026, 8:43 PM UTC.