QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

80 km NNW of Elfin Cove, Alaska

· 8.1 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Hoonah-Angoon Census Area 79 kmHaines Borough 85 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
8.1 km below the surface
Felt
no reports yet
Nearest
Hoonah-Angoon Census Area, 79 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 967 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 58.8363, -136.9761. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hoonah-Angoon Census Area, AK 79 km (49 mi) NW of here earthquakes near Hoonah-Angoon Census Area
Haines Borough, AK 85 km (53 mi) WSW of here earthquakes near Haines Borough
Skagway Municipality, AK 123 km (77 mi) SW of here earthquakes near Skagway Municipality

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

Aftershocks so far

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

  1. 1.7 85 km WSW of Covenant Life, Alaska
  2. 1.7 88 km WSW of Covenant Life, Alaska
  3. 1.9 69 km WNW of Elfin Cove, Alaska
  4. 1.9 83 km NNW of Elfin Cove, Alaska
  5. 2.2 72 km SW of Covenant Life, Alaska
  6. 1.5 62 km SW of Covenant Life, Alaska
  7. 2.0 69 km WSW of Covenant Life, Alaska
  8. 1.9 48 km NW of Elfin Cove, Alaska
  9. 1.5 79 km SW of Covenant Life, Alaska
  10. 2.2 59 km SW of Covenant Life, Alaska
  11. 1.7 61 km SW of Covenant Life, Alaska
  12. 1.9 68 km NW of Elfin Cove, Alaska
  13. 1.6 47 km SW of Covenant Life, Alaska
  14. 1.5 82 km SW of Covenant Life, Alaska
  15. 2.1 53 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 5.3 on 2023-10-28 — it released about 180,000 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.