QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mw

50 km SSW of Covenant Life, Alaska

· 12 km deep · released about 15 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Haines Borough 48 kmHoonah-Angoon Census Area 73 kmSkagway Municipality 86 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 4.0 (mw)
Depth
12 km below the surface
Felt
146 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Haines Borough, 48 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1145 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 146 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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 59.0023, -136.3941. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Haines Borough, AK 48 km (30 mi) WSW of here earthquakes near Haines Borough
Hoonah-Angoon Census Area, AK 73 km (45 mi) NNW of here earthquakes near Hoonah-Angoon Census Area
Skagway Municipality, AK 86 km (54 mi) SW of here earthquakes near Skagway Municipality

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

Aftershocks so far

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

  1. 2.4 40 km WSW of Mud Bay, Alaska
  2. 1.5 58 km NW of Gustavus, Alaska
  3. 1.5 28 km SW of Covenant Life, Alaska
  4. 1.9 55 km NW of Gustavus, Alaska
  5. 1.7 25 km SW of Covenant Life, Alaska
  6. 2.3 55 km SW of Covenant Life, Alaska
  7. 1.8 49 km SSW of Covenant Life, Alaska
  8. 1.6 44 km S of Covenant Life, Alaska
  9. 2.0 37 km WSW of Covenant Life, Alaska
  10. 1.8 42 km SSW of Covenant Life, Alaska
  11. 1.7 53 km NNW of Elfin Cove, Alaska
  12. 2.3 32 km W of Covenant Life, Alaska
  13. 2.3 34 km WSW of Mud Bay, Alaska
  14. 1.6 33 km SW of Covenant Life, Alaska
  15. 3.1 50 km NNW of Gustavus, 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.