M1.7 earthquake 22 km S of Morton, Washington
A magnitude 1.7 earthquake struck 22 km S of Morton, Washington on Fri, Sep 11, 1987, 6:13 AM PDT (13:13 UTC), 11 km (7 mi) below the surface.
A larger quake followed: M2.8 22 km S of Morton, 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
- 1987-09-11 13:13:02 UTC
- Depth
- 11.0 km (6.9 mi), shallow
- Epicenter
- 46.357° N, 122.248° 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, 0.3 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 54°
- Stations used
- 24
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 2 in the 30 days before it.
After
- 2.822 km S of Morton, Washington · 14263 days ago · 11 km deep · 0 km away
- 1.622 km S of Morton, Washington · 14262 days ago · 12 km deep · 1 km away
- 2.616 km WSW of Alder, Washington · 14260 days ago · 18 km deep · 44 km away
- 1.53 km W of Deer Island, Oregon · 14259 days ago · 23 km deep · 68 km away
- 1.930 km E of Packwood, Washington · 14249 days ago · -1 km deep · 79 km away
- 1.715 km E of Castle Rock, Washington · 14245 days ago · 6 km deep · 36 km away
- 2.62 km W of Brush Prairie, Washington · 14242 days ago · 18 km deep · 74 km away
- 2.021 km SSE of Mossyrock, Washington · 14229 days ago · 7 km deep · 12 km away
- 2.025 km ENE of Ashford, Washington · 14226 days ago · -1 km deep · 69 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10223308. Read Tue, Sep 29, 2026, 2:38 AM UTC.