QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Southern Yukon Territory, Canada

Yes. A magnitude 1.8 earthquake was recorded in Southern Yukon Territory, Canada at 06:37 UTC on 2023-09-28, 7.3 km deep.

· 7.3 km deep · released about 15 lb of TNT

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Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 1.8 (ml)
Depth
7.3 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1130 days ago

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.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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

The largest earthquake within 50 km in our catalogue was M 4.8 on 2023-08-06 — about 32,000 times the energy of this one.

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 61.3549, -139.9321. Map © OpenStreetMap contributors.

Aftershocks so far

59 earthquakes have been recorded within 50 km since this one.

  1. 2.6 151 km ESE of McCarthy, Alaska
  2. 1.9 156 km ESE of McCarthy, Alaska
  3. 2.9 157 km ESE of McCarthy, Alaska
  4. 1.6 161 km ESE of McCarthy, Alaska
  5. 2.3 154 km ESE of McCarthy, Alaska
  6. 1.5 152 km ESE of McCarthy, Alaska
  7. 1.5 131 km E of McCarthy, Alaska
  8. 2.2 163 km N of Yakutat, Alaska
  9. 1.5 158 km E of McCarthy, Alaska
  10. 1.6 158 km E of McCarthy, Alaska
  11. 1.8 135 km E of McCarthy, Alaska
  12. 1.7 147 km E of McCarthy, Alaska
  13. 1.7 140 km ESE of McCarthy, Alaska
  14. 1.7 135 km ESE of McCarthy, Alaska
  15. 3.2 152 km SSE of Alcan Border, Alaska

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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.