M2.1 earthquake 42 km NE of Amboy, Washington
A magnitude 2.1 earthquake struck 42 km NE of Amboy, Washington on Thu, Mar 15, 1973, 6:15 AM PST (14:15 UTC), 2 km (1 mi) below the surface.
A larger quake followed: M3.4 29 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
- 2.1 (Md, duration), micro
- Magnitude from
- Pacific Northwest Seismic Network
- Local time
- UTC
- 1973-03-15 14:15:31 UTC
- Depth
- 2.4 km (1.5 mi), shallow
- Epicenter
- 46.178° N, 122.048° 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 3.9 km horizontally, 1.1 km in depth
- Magnitude uncertainty
- ±0.22
- Depth from
- From location
- Station coverage gap
- 257°, poorly surrounded by stations
- Stations used
- 5
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 6 in the 30 days before it.
After
- 1.93 km ENE of McKenna, Washington · 19548 days ago · 31 km deep · 92 km away
- 1.722 km ENE of Kalama, Washington · 19537 days ago · 32 km deep · 42 km away
- 3.029 km S of Morton, Washington · 19536 days ago · 16 km deep · 18 km away
- 2.110 km SE of Mineral, Washington · 19535 days ago · 26 km deep · 51 km away
- 2.414 km NNE of Ashford, Washington · 19528 days ago · 1 km deep · 78 km away
- 3.429 km S of Morton, Washington · 19524 days ago · 13 km deep · 19 km away
- 2.615 km NNE of Ashford, Washington · 19513 days ago · 6 km deep · 79 km away
- 2.516 km SSW of Packwood, Washington · 19500 days ago · -2 km deep · 41 km away
Before
- 2.212 km NE of Ashford, Washington · 19560 days ago · 6 km deep · 75 km away
- 1.76 km SE of Mineral, Washington · 19565 days ago · 16 km deep · 55 km away
- 2.77 km SE of Mineral, Washington · 19569 days ago · 19 km deep · 55 km away
- 2.531 km S of Mossyrock, Washington · 19575 days ago · 10 km deep · 30 km away
- 2.77 km SW of Morton, Washington · 19575 days ago · 15 km deep · 44 km away
- 1.62 km NNW of Kapowsin, Washington · 19578 days ago · 67 km deep · 93 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10855998. Read Fri, Oct 2, 2026, 10:25 AM UTC.