QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

91 km SSE of Halibut Cove, Alaska

Yes. A magnitude 2.3 earthquake was recorded 91 km SSE of Halibut Cove, Alaska, at 9:11 am AKST on 10 November 2024 (18:11 UTC), less than 1 km deep.

· 0.9 km deep · released about 85 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 2.3 (ml)
Depth
0.9 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 697 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 20 km (12 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 since 2016 was M 4.7 on 2020-10-10 — about 4,000 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 6.6 124 km SSE of Halibut Cove, Alaska · 34 km SE of this epicentre
  2. 5.7 78 km SSE of Port Graham, Alaska · 37 km WSW of this epicentre
  3. 5.2 114 km SSE of Halibut Cove, Alaska · 23 km SSE of this epicentre
  4. 5.2 131 km SE of Halibut Cove, Alaska · 46 km ESE of this epicentre
  5. 5.0 49 km SE of Port Graham, Alaska · 49 km WNW 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 58.8657, -150.4871. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.7 116 km SE of Port Graham, Alaska
  2. 3.0 63 km SE of Port Graham, Alaska
  3. 1.7 82 km SE of Port Graham, Alaska
  4. 1.9 67 km SE of Port Graham, Alaska
  5. 2.2 105 km SSE of Halibut Cove, Alaska
  6. 1.7 54 km SE of Seldovia, Alaska
  7. 2.8 113 km SE of Port Graham, Alaska
  8. 2.5 86 km SSE of Port Graham, Alaska
  9. 2.4 99 km SE of Halibut Cove, Alaska
  10. 2.1 57 km ESE of Port Graham, Alaska
  11. 2.4 114 km SE of Port Graham, Alaska
  12. 2.0 97 km SE of Port Graham, Alaska
  13. 2.3 63 km SE of Halibut Cove, Alaska
  14. 2.3 58 km SE of Halibut Cove, Alaska
  15. 1.9 56 km SSE of Halibut Cove, 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.