QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

36 km WSW of Mud Bay, Alaska

· 5.4 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Haines Borough 23 kmSkagway Municipality 69 kmHoonah-Angoon Census Area 69 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 2.7 (ml)
Depth
5.4 km below the surface
Felt
no reports yet
Nearest
Haines Borough, 23 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1220 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 59.0271, -135.9596. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Haines Borough, AK 23 km (14 mi) WSW of here earthquakes near Haines Borough
Skagway Municipality, AK 69 km (43 mi) SSW of here earthquakes near Skagway Municipality
Hoonah-Angoon Census Area, AK 69 km (43 mi) N of here earthquakes near Hoonah-Angoon Census Area
Juneau City and Borough, AK 126 km (78 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

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

  1. 1.5 52 km SSW of Covenant Life, Alaska
  2. 1.6 54 km SSW of Covenant Life, Alaska
  3. 1.5 53 km SSW of Covenant Life, Alaska
  4. 1.5 49 km SSW of Covenant Life, Alaska
  5. 1.6 53 km SSW of Covenant Life, Alaska
  6. 1.7 51 km SSW of Covenant Life, Alaska
  7. 1.8 50 km SSW of Covenant Life, Alaska
  8. 1.8 39 km SSW of Covenant Life, Alaska
  9. 2.1 52 km SSW of Covenant Life, Alaska
  10. 2.0 49 km SSW of Covenant Life, Alaska
  11. 1.6 51 km SSW of Covenant Life, Alaska
  12. 3.1 Southeastern Alaska
  13. 2.9 49 km SSW of Covenant Life, Alaska
  14. 2.7 50 km SSW of Covenant Life, Alaska
  15. 1.5 52 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 350 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.