QuakeIndex

Earthquake · reviewed by a seismologist

M 5.2mww

132 km S of Sand Point, Alaska

· 17 km deep · released about 950 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 5.2 (mww)
Depth
17 km below the surface
Felt
no reports yet
Measured shaking
intensity III (ShakeMap)
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 279 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 950 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7.9× the energy of this one
  3. Magna, Utah 2020 M 5.7 5.6× the energy of this one
  4. This earthquake M 5.2 about 950 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2,000× 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 54.1646, -160.1539. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 4.3 102 km S of Sand Point, Alaska
  2. 1.6 105 km SSE of Sand Point, Alaska
  3. 2.4 154 km SSE of Sand Point, Alaska
  4. 2.2 112 km S of Sand Point, Alaska
  5. 2.1 137 km SSE of Sand Point, Alaska
  6. 2.2 106 km SSE of Sand Point, Alaska
  7. 2.0 131 km S of Sand Point, Alaska
  8. 2.2 140 km S of Sand Point, Alaska
  9. 2.1 92 km S of Sand Point, Alaska
  10. 2.4 137 km S of Sand Point, Alaska
  11. 2.4 152 km S of Sand Point, Alaska
  12. 2.0 143 km S of Sand Point, Alaska
  13. 2.4 155 km S of Sand Point, Alaska
  14. 2.7 137 km S of Sand Point, Alaska
  15. 2.8 155 km S of Sand Point, 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.