QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Southeastern Alaska

· 20 km deep · released about 15 lb of TNT

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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
20 km below the surface
Felt
no reports yet
Nearest
Yakutat City and Borough, 155 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1192 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 59.1022, -138.3440. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yakutat City and Borough, AK 155 km (96 mi) SE of here earthquakes near Yakutat City and Borough

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

Aftershocks so far

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

  1. 1.5 60 km ESE of Yakutat, Alaska
  2. 2.0 75 km SE of Yakutat, Alaska
  3. 1.5 104 km WSW of Covenant Life, Alaska
  4. 2.0 112 km ESE of Yakutat, Alaska
  5. 1.8 112 km ESE of Yakutat, Alaska
  6. 3.6 113 km ESE of Yakutat, Alaska
  7. 2.8 112 km ESE of Yakutat, Alaska
  8. 1.6 71 km SE of Yakutat, Alaska
  9. 3.1 109 km SSE of Yakutat, Alaska
  10. 2.5 85 km ESE of Yakutat, Alaska
  11. 2.0 91 km E of Yakutat, Alaska
  12. 2.0 112 km ESE of Yakutat, Alaska
  13. 2.0 112 km ESE of Yakutat, Alaska
  14. 1.5 113 km WSW of Covenant Life, Alaska
  15. 1.6 118 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2021-02-08 — it released about 5,600 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.