M2.4 earthquake 21 km S of Morton, Washington
A magnitude 2.4 earthquake struck 21 km S of Morton, Washington on Wed, Dec 29, 1971, 7:31 AM PST (15:31 UTC), 24 km (15 mi) below the surface.
A larger quake followed: M2.9 1 km SW of Ketron, Washington. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.4 (md), micro
- Local time
- UTC
- 1971-12-29 15:31:14 UTC
- Depth
- 23.6 km (14.7 mi), shallow
- Epicenter
- 46.370° N, 122.304° 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 1.3 km horizontally, 3.0 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- From location
- Station coverage gap
- 274°, poorly surrounded by stations
- Stations used
- 6
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 2 in the 30 days before it.
After
- 2.91 km SW of Ketron, Washington · 19996 days ago · 24 km deep · 90 km away
- 2.14 km SW of Yelm, Washington · 19980 days ago · 23 km deep · 66 km away
- 2.213 km SSW of Alder, Washington · 19956 days ago · 29 km deep · 36 km away
- 2.219 km SSE of Packwood, Washington · 19952 days ago · 14 km deep · 55 km away
Before
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10852393. Read Mon, Sep 28, 2026, 5:03 PM UTC.