Earthquake · reviewed by a seismologist
M 2.4ml
Earthquake near Ault Field, WA
No earthquake was likely felt in Ault Field in the 24 hours to 7:10 pm PST (03:10 UTC). The last one was M 4.2, 104 km (65 mi) S, at 2:05 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 9,329 felt reports to USGS. Every earthquake near Ault Field
This page: a magnitude 2.4 earthquake was recorded 11 km (7 mi) west of Ault Field, WA, at 8:26 pm PDT on 23 July 2020 (03:26 UTC), 16 km deep. 8 people have reported feeling it to USGS.
USGS: 11 km W of Ault Field, Washington
89 km (55 mi) NNW of Seattle, WA · 52 km (32 mi) SSW of Bellingham, WA
- When
- 8:26 pm PDT on 23 July 2020 ()
- Where
- 11 km (7 mi) west of Ault Field, WA · earthquakes near Ault Field
- Magnitude
- M 2.4 (ml)
- Depth
- 16 km below the surface
- Felt
- 8 reports · strongest reported intensity III
- Nearest
- Island County, 24 km SSE
- Nearest mapped fault
- Utsalady Point fault, 2 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2231 days ago
Earthquake alerts for Ault Field, WA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 15 km (9 mi) from the epicentre. In Ault Field, 11 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Oak Harbor, Coupeville, Anacortes, Friday Harbor, Port Townsend, Camano.
How big was it?
This earthquake released about 130 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
- Magna, Utah 2020 M 5.7 80,000× the energy of this one
- Around the size people start to feel M 3.0 7.2× the energy of this one
- This earthquake M 2.4 about 130 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 6.0 San Juan Islands, Washington · 39 km N of this epicentre
- 5.0 6 km W of Conway, Washington · 29 km E of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 48.3507, -122.8278. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Island County, WA | 24 km (15 mi) | SSE | earthquakes near Island County |
| San Juan County, WA | 27 km (17 mi) | NW | earthquakes near San Juan County |
| Skagit County, WA | 76 km (47 mi) | ENE | earthquakes near Skagit County |
| Jefferson County, WA | 80 km (50 mi) | SW | earthquakes near Jefferson County |
| Kitsap County, WA | 80 km (50 mi) | S | earthquakes near Kitsap County |
| Clallam County, WA | 83 km (52 mi) | WSW | earthquakes near Clallam County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.9 8 km ENE of Port Townsend, Washington
- 1.7 1 km SE of Mount Vernon, Washington
- 1.6 3 km NNW of La Conner, Washington
- 2.4 8 km N of Anacortes, Washington
- 1.8 8 km WNW of Orcas, Washington
- 1.7 8 km WNW of Orcas, Washington
- 1.7 11 km WNW of Coupeville, Washington
- 1.6 16 km NNW of Jamestown, Washington
- 1.8 1 km NE of Oak Harbor, Washington
- 1.8 8 km SW of Anacortes, Washington
- 2.1 1 km ESE of Burlington, Washington
- 2.5 13 km WNW of Ault Field, Washington
- 1.8 3 km NNE of Burlington, Washington
- 1.7 2 km ESE of Burlington, Washington
- 2.2 3 km ESE of Burlington, Washington
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.