QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3ml

88 km WNW of Elfin Cove, Alaska

· 7.5 km deep · released about 43 tons of TNT

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10 km30 km60 km120 km N Hoonah-Angoon Census Area 110 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 4.3 (ml)
Depth
7.5 km below the surface
Felt
21 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Hoonah-Angoon Census Area, 110 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2381 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 21 people have reported feeling it to USGS.

How big was it?

This earthquake released about 43 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 4,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 180× the energy of this one
  3. Magna, Utah 2020 M 5.7 130× the energy of this one
  4. This earthquake M 4.3 about 43 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 89× 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 58.4490, -137.7741. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hoonah-Angoon Census Area, AK 110 km (68 mi) W 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

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

  1. 2.4 58 km WNW of Elfin Cove, Alaska
  2. 1.7 94 km NW of Elfin Cove, Alaska
  3. 1.9 104 km W of Elfin Cove, Alaska
  4. 2.0 101 km W of Elfin Cove, Alaska
  5. 1.8 97 km W of Elfin Cove, Alaska
  6. 3.3 99 km W of Elfin Cove, Alaska
  7. 1.8 92 km W of Elfin Cove, Alaska
  8. 1.6 82 km NW of Elfin Cove, Alaska
  9. 2.2 108 km NW of Elfin Cove, Alaska
  10. 2.8 91 km NW of Elfin Cove, Alaska
  11. 2.5 73 km W of Elfin Cove, Alaska
  12. 2.5 92 km NW of Elfin Cove, Alaska
  13. 1.8 102 km NW of Elfin Cove, Alaska
  14. 2.2 76 km W of Elfin Cove, Alaska
  15. 2.3 118 km WNW of Elfin Cove, 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 5.1 on 2019-12-18 — it released about 16 times the energy of this one.

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

On USGS

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