QuakeIndex

Earthquake · reviewed by a seismologist

M 4.7mb

44 km W of Lake Minchumina, Alaska

· 10 km deep · released about 170 tons 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 4.7 (mb)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity II
Measured shaking
intensity IV (ShakeMap)
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1238 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 170 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 1,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 45× the energy of this one
  3. Magna, Utah 2020 M 5.7 32× the energy of this one
  4. This earthquake M 4.7 about 170 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 350× more

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 63.8634, -153.2180. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.4 68 km NE of Nikolai, Alaska
  2. 1.6 68 km NNE of Nikolai, Alaska
  3. 2.2 67 km NNE of Nikolai, Alaska
  4. 2.2 37 km WSW of Lake Minchumina, Alaska
  5. 1.7 40 km SSW of Lake Minchumina, Alaska
  6. 1.9 43 km SSW of Lake Minchumina, Alaska
  7. 2.8 33 km SW of Lake Minchumina, Alaska
  8. 1.6 63 km SW of Lake Minchumina, Alaska
  9. 1.6 42 km NW of Lake Minchumina, Alaska
  10. 1.8 59 km NW of Lake Minchumina, Alaska
  11. 1.8 63 km SW of Lake Minchumina, Alaska
  12. 1.5 34 km W of Lake Minchumina, Alaska
  13. 1.5 39 km SSW of Lake Minchumina, Alaska
  14. 1.5 26 km WNW of Lake Minchumina, Alaska
  15. 2.7 39 km WNW of Lake Minchumina, 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.