QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

191 km SSE of Sand Point, Alaska

· 10 km deep · released about 43 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 2.1 (ml)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2196 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 53.7153, -159.4881. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.1 160 km SSE of Sand Point, Alaska
  2. 3.2 145 km SSE of Sand Point, Alaska
  3. 2.8 150 km SSE of Sand Point, Alaska
  4. 4.3 150 km SSE of Sand Point, Alaska
  5. 3.2 152 km SSE of Sand Point, Alaska
  6. 3.0 187 km SSE of Sand Point, Alaska
  7. 3.0 176 km SSE of Sand Point, Alaska
  8. 3.9 191 km SSE of Sand Point, Alaska
  9. 4.2 192 km SSE of Sand Point, Alaska
  10. 2.9 151 km SSE of Sand Point, Alaska
  11. 3.5 145 km SSE of Sand Point, Alaska
  12. 2.7 151 km SSE of Sand Point, Alaska
  13. 3.2 149 km SSE of Sand Point, Alaska
  14. 3.3 149 km SSE of Sand Point, Alaska
  15. 4.0 151 km SSE 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.