QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

27 km S of Mud Bay, Alaska

· 4.5 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Haines Borough 24 kmHoonah-Angoon Census Area 63 kmSkagway Municipality 72 kmJuneau City and Borough 92 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 3.0 (ml)
Depth
4.5 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Haines Borough, 24 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1598 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 58.9094, -135.3775. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Haines Borough, AK 24 km (15 mi) SSE of here earthquakes near Haines Borough
Hoonah-Angoon Census Area, AK 63 km (39 mi) NNE of here earthquakes near Hoonah-Angoon Census Area
Skagway Municipality, AK 72 km (45 mi) S of here earthquakes near Skagway Municipality
Juneau City and Borough, AK 92 km (57 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

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

  1. 2.3 11 km WSW of Lutak, Alaska
  2. 3.5 26 km E of Mud Bay, Alaska
  3. 1.7 30 km NNE of Excursion Inlet, Alaska
  4. 1.5 3 km SSW of Mud Bay, Alaska
  5. 3.0 5 km WSW of Haines, Alaska
  6. 1.9 25 km S of Mud Bay, Alaska
  7. 1.5 34 km WSW of Mud Bay, Alaska
  8. 1.6 22 km S of Mud Bay, Alaska
  9. 2.0 Southeastern Alaska
  10. 2.0 25 km SSE of Mud Bay, Alaska
  11. 1.8 Southeastern Alaska
  12. 1.9 Southeastern Alaska
  13. 2.3 27 km SSE of Mud Bay, Alaska
  14. 2.2 16 km W of Mud Bay, Alaska
  15. 1.6 15 km SW of Haines, 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.