M1.5 earthquake 37 km S of Morton, Washington
A magnitude 1.5 earthquake struck 37 km S of Morton, Washington on Fri, Apr 7, 1978, 6:53 AM PST (14:53 UTC), 11 km (7 mi) below the surface.
A larger quake followed: M1.8 18 km SE of Carbonado, 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
- 1978-04-07 14:53:09 UTC
- Depth
- 10.9 km (6.8 mi), shallow
- Epicenter
- 46.225° N, 122.182° 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, 1.9 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 202°, poorly surrounded by stations
- Stations used
- 8
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10846468. Read Tue, Sep 22, 2026, 8:19 AM UTC.