QuakeIndex

Earthquake · automatic estimate, may change

M 1.5ml

18 km ESE of Bear Creek, Alaska

· 21 km deep · released about 5.4 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 1.5 (ml)
Depth
21 km below the surface
Felt
no reports yet
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 2203 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 60.0839, -149.0972. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.5 6 km SSE of Lowell Point, Alaska
  2. 1.5 49 km SW of Chenega, Alaska
  3. 1.9 35 km WSW of Chenega, Alaska
  4. 3.0 22 km E of Crown Point, Alaska
  5. 1.5 16 km SE of Lowell Point, Alaska
  6. 3.1 19 km E of Crown Point, Alaska
  7. 2.3 14 km NW of Bear Creek, Alaska
  8. 1.9 17 km SSW of Lowell Point, Alaska
  9. 1.8 32 km ESE of Primrose, Alaska
  10. 1.6 18 km SSW of Lowell Point, Alaska
  11. 1.5 37 km WSW of Chenega, Alaska
  12. 1.9 27 km E of Bear Creek, Alaska
  13. 2.2 32 km WSW of Chenega, Alaska
  14. 1.7 20 km E of Crown Point, Alaska
  15. 1.5 49 km SW of Chenega, 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.