QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

99 km NW of Elfin Cove, Alaska

· 3.3 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Hoonah-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 1.8 (ml)
Depth
3.3 km below the surface
Felt
no reports yet
Nearest
Hoonah-Angoon Census Area, 109 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1137 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 lb of TNT

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 58.7838, -137.6176. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hoonah-Angoon Census Area, AK 109 km (68 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

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

  1. 1.9 114 km NW of Elfin Cove, Alaska
  2. 1.6 110 km WSW of Covenant Life, Alaska
  3. 2.3 112 km ESE of Yakutat, Alaska
  4. 1.5 112 km ESE of Yakutat, Alaska
  5. 2.3 53 km WNW of Elfin Cove, Alaska
  6. 2.3 54 km NW of Elfin Cove, Alaska
  7. 2.2 59 km WNW of Elfin Cove, Alaska
  8. 1.9 115 km WSW of Covenant Life, Alaska
  9. 3.3 112 km ESE of Yakutat, Alaska
  10. 1.9 116 km WSW of Covenant Life, Alaska
  11. 1.6 86 km WNW of Elfin Cove, Alaska
  12. 2.0 75 km WSW of Covenant Life, Alaska
  13. 1.7 116 km WSW of Covenant Life, Alaska
  14. 2.4 64 km WNW of Elfin Cove, Alaska
  15. 1.7 74 km WSW of Covenant Life, 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.