QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

5 km NNW of Klukwan, Alaska

· 11 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagway Municipality 36 kmHaines Borough 44 kmHoonah-Angoon Census Area 117 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 1.8 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Skagway Municipality, 36 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1669 days ago

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

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.

Where

Epicentre 59.4514, -135.9333. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagway Municipality, AK 36 km (22 mi) WSW of here earthquakes near Skagway Municipality
Haines Borough, AK 44 km (27 mi) NNW of here earthquakes near Haines Borough
Hoonah-Angoon Census Area, AK 117 km (72 mi) N of here earthquakes near Hoonah-Angoon Census Area

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

Aftershocks so far

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

  1. 2.4 22 km SW of Covenant Life, Alaska
  2. 1.7 Southeastern Alaska
  3. 1.7 20 km NW of Mosquito Lake, Alaska
  4. 2.4 22 km SW of Covenant Life, Alaska
  5. 1.6 28 km NW of Mosquito Lake, Alaska
  6. 1.8 24 km SSW of Covenant Life, Alaska
  7. 1.7 12 km NW of Mosquito Lake, Alaska
  8. 1.6 23 km SSW of Covenant Life, Alaska
  9. 2.0 29 km SSW of Covenant Life, Alaska
  10. 1.6 19 km N of Mosquito Lake, Alaska
  11. 2.6 20 km SSW of Covenant Life, Alaska
  12. 1.5 11 km NE of Mosquito Lake, Alaska
  13. 2.7 36 km WSW of Mud Bay, Alaska
  14. 1.5 21 km NNW of Mosquito Lake, Alaska
  15. 1.6 31 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 7,900 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.