QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

71 km NW of Gustavus, Alaska

Yes. A magnitude 2.4 earthquake was recorded 71 km NW of Gustavus, Alaska, at 6:14 am AKDT on 10 October 2023 (14:14 UTC), 7.7 km deep.

· 7.7 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hoonah-Angoon Census Area 65 kmHaines Borough 71 kmSkagway Municipality 113 km
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 2.4 (ml)
Depth
7.7 km below the surface
Felt
no reports yet
Nearest
Hoonah-Angoon Census Area, 65 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1063 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 120 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.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 5.0 on 2019-09-01 — about 7,900 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 6.1 77 km SW of Covenant Life, Alaska · 17 km NW of this epicentre
  2. 5.9 41 km SSW of Covenant Life, Alaska · 36 km NNE of this epicentre
  3. 5.2 63 km SW of Covenant Life, Alaska · 19 km N of this epicentre
  4. 5.0 66 km NNW of Elfin Cove, Alaska · 5 km SSE 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 58.8138, -136.6923. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hoonah-Angoon Census Area, AK 65 km (41 mi) SE earthquakes near Hoonah-Angoon Census Area
Haines Borough, AK 71 km (44 mi) ENE earthquakes near Haines Borough
Skagway Municipality, AK 113 km (70 mi) NE earthquakes near Skagway Municipality

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 52 km SSW of Covenant Life, Alaska
  2. 2.2 54 km SSW of Covenant Life, Alaska
  3. 2.2 48 km SSW of Covenant Life, Alaska
  4. 1.7 51 km SSW of Covenant Life, Alaska
  5. 1.7 53 km SSW of Covenant Life, Alaska
  6. 1.6 51 km SSW of Covenant Life, Alaska
  7. 2.0 54 km SSW of Covenant Life, Alaska
  8. 2.2 54 km SW of Covenant Life, Alaska
  9. 1.6 51 km SSW of Covenant Life, Alaska
  10. 1.9 53 km SW of Covenant Life, Alaska
  11. 1.9 53 km SSW of Covenant Life, Alaska
  12. 1.6 35 km SSW of Covenant Life, Alaska
  13. 1.7 53 km SSW of Covenant Life, Alaska
  14. 1.6 46 km SSW of Covenant Life, Alaska
  15. 1.6 51 km SSW of Covenant Life, 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.