QuakeIndex

Earthquake · reviewed by a seismologist

M 5.0mw

98 km NE of Ambler, Alaska

· 11 km deep · released about 480 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 5.0 (mw)
Depth
11 km below the surface
Felt
8 reports · strongest reported intensity IV
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1139 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 480 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16× the energy of this one
  3. Magna, Utah 2020 M 5.7 11× the energy of this one
  4. This earthquake M 5.0 about 480 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 1,000× 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 67.7739, -156.3956. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.5 100 km NNE of Ambler, Alaska
  2. 1.6 79 km NNE of Ambler, Alaska
  3. 1.5 118 km NNE of Kobuk, Alaska
  4. 1.7 78 km NNE of Ambler, Alaska
  5. 1.8 82 km NNE of Ambler, Alaska
  6. 1.5 82 km NNE of Ambler, Alaska
  7. 1.5 79 km NNE of Ambler, Alaska
  8. 1.9 55 km N of Kobuk, Alaska
  9. 2.6 57 km NNE of Kobuk, Alaska
  10. 2.5 75 km NNE of Ambler, Alaska
  11. 2.5 68 km NE of Kobuk, Alaska
  12. 2.7 99 km NE of Ambler, Alaska
  13. 1.8 81 km NNE of Ambler, Alaska
  14. 1.8 112 km NE of Ambler, Alaska
  15. 1.5 79 km NE of Ambler, 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.