QuakeIndex

ice quake · reviewed by a seismologist

M 2.1ml

8 km ENE of Klukwan, Alaska

· 0.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagway Municipality 27 kmHaines Borough 39 kmHoonah-Angoon Census Area 115 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 2.1 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Skagway Municipality, 27 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 767 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as ice quake, not an earthquake.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 59.4357, -135.7527. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagway Municipality, AK 27 km (17 mi) WSW of here earthquakes near Skagway Municipality
Haines Borough, AK 39 km (24 mi) NNW of here earthquakes near Haines Borough
Hoonah-Angoon Census Area, AK 115 km (71 mi) N of here earthquakes near Hoonah-Angoon Census Area
Juneau City and Borough, AK 149 km (92 mi) NW of here earthquakes near Juneau City and Borough

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

Aftershocks so far

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

  1. 3.0 32 km SSW of Covenant Life, Alaska
  2. 2.9 19 km NNW of Mosquito Lake, Alaska
  3. 2.9 40 km WSW of Haines, Alaska
  4. 3.5 16 km N of Mosquito Lake, Alaska
  5. 2.3 11 km WSW of Lutak, Alaska
  6. 1.8 17 km N of Mosquito Lake, Alaska
  7. 2.3 16 km N of Mosquito Lake, Alaska
  8. 2.0 21 km N of Mosquito Lake, Alaska
  9. 2.4 20 km N of Mosquito Lake, Alaska
  10. 1.9 9 km NE of Mosquito Lake, Alaska
  11. 1.6 8 km NNW of Mosquito Lake, Alaska
  12. 1.7 35 km SSW of Covenant Life, Alaska
  13. 1.5 3 km SSW of Mud Bay, Alaska
  14. 3.0 5 km WSW of Haines, Alaska
  15. 2.0 25 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2021-07-08 — it released about 2,800 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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