QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2mb

51 km ESE of Mud Bay, Alaska

· 2.1 km deep · released about 30 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Haines Borough 61 kmSkagway Municipality 74 kmJuneau City and Borough 78 kmHoonah-Angoon Census Area 107 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 4.2 (mb)
Depth
2.1 km below the surface
Felt
84 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Haines Borough, 61 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1380 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 84 people have reported feeling it to USGS.

How big was it?

This earthquake released about 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 5,600× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 250× the energy of this one
  3. Magna, Utah 2020 M 5.7 180× the energy of this one
  4. This earthquake M 4.2 about 30 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 63× more

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 59.0499, -134.5066. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Haines Borough, AK 61 km (38 mi) E of here earthquakes near Haines Borough
Skagway Municipality, AK 74 km (46 mi) SE of here earthquakes near Skagway Municipality
Juneau City and Borough, AK 78 km (48 mi) NNW of here earthquakes near Juneau City and Borough
Hoonah-Angoon Census Area, AK 107 km (67 mi) NE 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

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

  1. 2.8 60 km N of Juneau, Alaska
  2. 3.5 26 km E of Mud Bay, Alaska
  3. 3.0 45 km SE of Mud Bay, Alaska
  4. 1.8 45 km SE of Mud Bay, Alaska
  5. 2.4 56 km N of Juneau, Alaska
  6. 2.6 56 km N of Juneau, Alaska
  7. 2.3 58 km N of Juneau, Alaska
  8. 2.8 58 km N of Juneau, Alaska
  9. 2.3 34 km E of Skagway, Alaska
  10. 2.0 70 km ESE of Mud Bay, Alaska
  11. 2.1 64 km ESE of Mud Bay, Alaska
  12. 1.8 66 km ESE of Mud Bay, Alaska
  13. 2.1 51 km N of Juneau, Alaska
  14. 3.3 48 km ESE of Mud Bay, Alaska
  15. 1.5 40 km ESE of Mud Bay, 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.