QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

83 km WSW of Elfin Cove, Alaska

· 11 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Hoonah-Angoon Census Area 116 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
11 km below the surface
Felt
no reports yet
Nearest
Hoonah-Angoon Census Area, 116 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2574 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 57.9785, -137.7009. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Hoonah-Angoon Census Area, AK 116 km (72 mi) WSW 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. 2.7 82 km WSW of Elfin Cove, AK
  2. 2.0 87 km WSW of Elfin Cove, Alaska
  3. 2.1 87 km WSW of Elfin Cove, Alaska
  4. 2.1 74 km WSW of Elfin Cove, Alaska
  5. 1.8 84 km WSW of Elfin Cove, Alaska
  6. 2.0 88 km WSW of Elfin Cove, Alaska
  7. 1.8 82 km WSW of Elfin Cove, Alaska
  8. 2.6 91 km WSW of Elfin Cove, Alaska
  9. 1.9 85 km WSW of Elfin Cove, Alaska
  10. 2.4 72 km WNW of Elfin Cove, Alaska
  11. 2.5 86 km WSW of Elfin Cove, Alaska
  12. 2.2 86 km WSW of Elfin Cove, Alaska
  13. 2.6 102 km W of Elfin Cove, Alaska
  14. 2.0 76 km WSW of Elfin Cove, Alaska
  15. 1.9 80 km WSW 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 4.0 on 2019-08-05 — it released about 2,000 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.