QuakeIndex

Earthquake · reviewed by a seismologist

M 6.3mww

48 km NW of Mosquito Lake, Alaska

· 2.5 km deep · released about 43 kilotons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagway Municipality 82 kmHaines Borough 103 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 6.3 (mww)
Depth
2.5 km below the surface
Felt
486 reports · strongest reported intensity VIII
Measured shaking
intensity VIII (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Skagway Municipality, 82 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1147 days ago

This was a strong earthquake. Damage is likely near the epicentre and it is felt over a wide area. 486 people have reported feeling it to USGS.

How big was it?

This earthquake released about 43 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 7.3 would have released about 32 times as much.

  1. Ridgecrest, California 2019 M 7.1 16× the energy of this one
  2. Loma Prieta, California 1989 M 6.9 7.9× the energy of this one
  3. Northridge, California 1994 M 6.7 4× the energy of this one
  4. This earthquake M 6.3 about 43 kilotons of TNT
  5. Mineral, Virginia 2011 M 5.8 this one released 5.6× more
  6. Magna, Utah 2020 M 5.7 this one released 7.9× 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 59.8295, -136.7042. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagway Municipality, AK 82 km (51 mi) WNW of here earthquakes near Skagway Municipality
Haines Borough, AK 103 km (64 mi) NW of here earthquakes near Haines 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. 3.8 46 km NW of Mosquito Lake, Alaska
  2. 3.1 43 km NW of Mosquito Lake, Alaska
  3. 3.1 34 km NW of Mosquito Lake, Alaska
  4. 2.6 47 km NW of Mosquito Lake, Alaska
  5. 2.8 42 km NW of Mosquito Lake, Alaska
  6. 1.6 45 km NW of Mosquito Lake, Alaska
  7. 1.7 46 km NW of Mosquito Lake, Alaska
  8. 1.8 50 km NW of Mosquito Lake, Alaska
  9. 2.2 41 km NW of Mosquito Lake, Alaska
  10. 2.1 42 km NW of Mosquito Lake, Alaska
  11. 3.7 53 km NW of Mosquito Lake, Alaska
  12. 3.6 43 km NW of Mosquito Lake, Alaska
  13. 4.1 Southeastern Alaska
  14. 2.0 40 km NW of Mosquito Lake, Alaska
  15. 2.4 40 km NW of Mosquito Lake, 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 6.2 on 2017-05-01.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.