QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

262 km SW of Adak, Alaska

· 10 km deep · released about 340 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 2.7 (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 1427 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 50.1102, -179.1241. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.1 257 km SSW of Adak, Alaska
  2. 2.6 250 km SW of Adak, Alaska
  3. 3.6 265 km SW of Adak, Alaska
  4. 2.7 283 km SW of Adak, Alaska
  5. 3.5 276 km SW of Adak, Alaska
  6. 2.7 247 km SW of Adak, Alaska
  7. 2.6 271 km SSW of Adak, Alaska
  8. 2.9 234 km SW of Adak, Alaska
  9. 2.9 289 km SW of Adak, Alaska
  10. 3.9 265 km SSW of Adak, Alaska
  11. 2.9 229 km SW of Adak, Alaska
  12. 3.2 275 km SW of Adak, Alaska
  13. 2.8 263 km SW of Adak, Alaska
  14. 2.2 292 km SW of Adak, Alaska
  15. 3.7 269 km SW 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2017-07-01 — it released about 250 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.