explosion · reviewed by a seismologist
M 1.9ml
9 km NE of Coquitlam, Canada
No: USGS classifies this as a explosion, not an earthquake. A magnitude 1.9 explosion was recorded 9 km NE of Coquitlam, Canada, at 1:12 pm PDT on 20 October 2023 (20:12 UTC), 8.8 km deep.
- When
- Magnitude
- M 1.9 (ml)
- Depth
- 8.8 km below the surface
- Felt
- no reports yet
- Nearest
- Whatcom County, 82 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 331 days ago
Earthquake alerts for Blaine, WA
Get a notification in this browser when USGS records an earthquake near Blaine, WA. No account or email needed.
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 11 km (7 mi) from the epicentre. 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.
USGS catalogues this as explosion, not an earthquake.
How big was it?
This earthquake released about 18 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 840,000× the energy of this one
- Magna, Utah 2020 M 5.7 600,000× the energy of this one
- Around the size people start to feel M 3.0 53× the energy of this one
- This earthquake M 1.9 about 18 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.
Where
Epicentre 49.3372, -122.6777. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Whatcom County, WA | 82 km (51 mi) | SE | earthquakes near Whatcom County |
| San Juan County, WA | 97 km (61 mi) | SSW | earthquakes near San Juan County |
| Skagit County, WA | 113 km (70 mi) | SE | earthquakes near Skagit County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
43 earthquakes have been recorded within 50 km since this one.
- 1.6 9 km NE of Coquitlam, Canada
- 1.2 7 km NE of Abbotsford, Canada
- 1.4 10 km NE of Abbotsford, Canada
- 1.3 11 km E of Mission, Canada
- 1.4 12 km E of Mission, Canada
- 1.0 8 km NE of Abbotsford, Canada
- 1.1 11 km NE of Abbotsford, Canada
- 1.4 7 km ENE of Abbotsford, Canada
- 0.8 6 km ESE of Mission, Canada
- 1.1 13 km ENE of Mission, Canada
- 1.4 11 km NE of Abbotsford, Canada
- 1.0 9 km ENE of Mission, Canada
- 1.5 9 km ENE of Port Coquitlam, Canada
- 1.2 12 km ENE of Mission, Canada
- 1.6 7 km ENE of Abbotsford, Canada
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.