M1.7 earthquake 8 km W of Ault Field, Washington
A magnitude 1.7 earthquake struck 8 km W of Ault Field, Washington on Sun, Jun 20, 1999, 3:17 AM PDT (10:17 UTC), 22 km (14 mi) below the surface.
A larger quake followed: M2.7 Washington-British Columbia border region. 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
- 1999-06-20 10:17:35 UTC
- Depth
- 21.9 km (13.6 mi), shallow
- Epicenter
- 48.341° N, 122.793° 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 0.6 km horizontally, 1.0 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 99°
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 0 in the 30 days before it.
After
- 1.89 km W of Ault Field, Washington · 9963 days ago · 23 km deep · 1 km away
- 2.25 km W of Lake Cavanaugh, Washington · 9957 days ago · 7 km deep · 52 km away
- 2.7Washington-British Columbia border region · 9954 days ago · 19 km deep · 70 km away
- 2.27 km SSE of Point Roberts, Washington · 9954 days ago · 20 km deep · 67 km away
- 1.517 km S of Point Roberts, Washington · 9947 days ago · 4 km deep · 58 km away
- 1.99 km NNE of Lake Marcel-Stillwater, Washington · 9946 days ago · 5 km deep · 95 km away
- 1.59 km NNE of Lake Marcel-Stillwater, Washington · 9946 days ago · 7 km deep · 95 km away
- 1.51 km SE of Brier, Washington · 9938 days ago · 19 km deep · 74 km away
- 2.12 km WSW of Lochsloy, Washington · 9936 days ago · 0 km deep · 63 km away
- 1.57 km SW of Rockport, Washington · 9935 days ago · 8 km deep · 85 km away
- 1.83 km E of Yarrow Point, Washington · 9929 days ago · 21 km deep · 90 km away
- 1.99 km ENE of Duvall, Washington · 9926 days ago · 4 km deep · 93 km away
- 2.29 km ENE of Duvall, Washington · 9926 days ago · 4 km deep · 93 km away
Earthquakes todayWashington earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uw10474063. Read Tue, Sep 29, 2026, 1:14 PM UTC.