QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

201 km SSE of Adak, Alaska

· 23 km deep · released about 950 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 3.0 (ml)
Depth
23 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1608 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 50.3394, -175.1074. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.4 174 km SE of Adak, Alaska
  2. 3.0 205 km S of Atka, Alaska
  3. 3.1 192 km SE of Adak, Alaska
  4. 2.8 202 km SSW of Atka, Alaska
  5. 2.8 195 km SE of Adak, Alaska
  6. 3.0 207 km S of Atka, Alaska
  7. 2.3 224 km SSE of Adak, Alaska
  8. 2.8 185 km S of Atka, Alaska
  9. 3.8 177 km SSE of Adak, Alaska
  10. 3.2 198 km SE of Adak, Alaska
  11. 3.2 201 km SSW of Atka, Alaska
  12. 2.1 207 km SSE of Adak, Alaska
  13. 3.0 202 km SSE of Adak, Alaska
  14. 2.3 199 km SSE of Adak, Alaska
  15. 2.7 188 km SSW of Atka, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2016-06-29 — it released about 1,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.