QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2mb

88 km NW of Elfin Cove, Alaska

· 6.3 km deep · released about 30 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hoonah-Angoon Census Area 101 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
6.3 km below the surface
Felt
1 report · strongest reported intensity II
Measured shaking
intensity IV (ShakeMap)
Nearest
Hoonah-Angoon Census Area, 101 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1527 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has 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 58.6812, -137.5448. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hoonah-Angoon Census Area, AK 101 km (63 mi) WNW of here earthquakes near Hoonah-Angoon Census Area
Haines Borough, AK 122 km (76 mi) WSW of here earthquakes near Haines Borough

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

Aftershocks so far

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

  1. 2.3 52 km NW of Elfin Cove, Alaska
  2. 1.7 89 km NW of Elfin Cove, Alaska
  3. 2.3 89 km NW of Elfin Cove, Alaska
  4. 1.9 56 km NW of Elfin Cove, Alaska
  5. 2.0 52 km NW of Elfin Cove, Alaska
  6. 2.2 52 km NW of Elfin Cove, Alaska
  7. 2.8 103 km NW of Elfin Cove, Alaska
  8. 1.8 92 km W of Elfin Cove, Alaska
  9. 2.1 90 km W of Elfin Cove, Alaska
  10. 1.6 75 km SW of Covenant Life, Alaska
  11. 2.2 78 km WSW of Covenant Life, Alaska
  12. 1.8 120 km NW of Elfin Cove, Alaska
  13. 1.7 78 km SW of Covenant Life, Alaska
  14. 1.7 British Columbia, Canada
  15. 1.6 Southeastern 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 22 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.