QuakeIndex

Earthquake · reviewed by a seismologist

M 5.0mb

165 km SSE of Adak, Alaska

· 10 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 (mb)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1152 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

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 50.5155, -175.6546. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.5 165 km SSE of Adak, Alaska
  2. 2.2 162 km SE of Adak, Alaska
  3. 2.1 140 km SE of Adak, Alaska
  4. 3.7 180 km SSE of Adak, Alaska
  5. 4.0 186 km SSE of Adak, Alaska
  6. 3.1 149 km SSE of Adak, Alaska
  7. 2.4 202 km SSE of Adak, Alaska
  8. 1.6 135 km SSE of Adak, Alaska
  9. 3.3 179 km SSE of Adak, Alaska
  10. 1.9 195 km SSE of Adak, Alaska
  11. 2.9 179 km SSE of Adak, Alaska
  12. 4.5 146 km SSE of Adak, Alaska
  13. 1.8 177 km SSE of Adak, Alaska
  14. 1.9 184 km SSE of Adak, Alaska
  15. 1.9 167 km SE of Adak, 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.