QuakeIndex

Earthquake · reviewed by a seismologist

M 4.5ml

56 km SSW of Pelican, Alaska

· 14 km deep · released about 85 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sitka City and Borough 73 kmHoonah-Angoon Census Area 109 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 4.5 (ml)
Depth
14 km below the surface
Felt
121 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Sitka City and Borough, 73 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1653 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 121 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 89× the energy of this one
  3. Magna, Utah 2020 M 5.7 63× the energy of this one
  4. This earthquake M 4.5 about 85 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 180× 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 57.4685, -136.4624. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sitka City and Borough, AK 73 km (45 mi) WNW of here earthquakes near Sitka City and Borough
Hoonah-Angoon Census Area, AK 109 km (68 mi) SSW 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

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

  1. 2.0 55 km WNW of Sitka, Alaska
  2. 2.1 60 km WNW of Sitka, Alaska
  3. 1.5 62 km WNW of Sitka, Alaska
  4. 2.6 66 km SSW of Pelican, Alaska
  5. 2.0 49 km SSW of Pelican, Alaska
  6. 3.0 70 km SSW of Pelican, Alaska
  7. 2.1 57 km WNW of Sitka, Alaska
  8. 2.0 62 km WNW of Sitka, Alaska
  9. 1.9 43 km SSW of Pelican, Alaska
  10. 1.9 48 km W of Sitka, Alaska
  11. 1.6 53 km W of Sitka, Alaska
  12. 3.7 26 km WSW of Pelican, Alaska
  13. 1.9 57 km WNW of Sitka, Alaska
  14. 2.1 62 km WNW of Sitka, Alaska
  15. 1.9 55 km WNW of Sitka, 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.