QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

14 km NNE of Perryville, Alaska

· 70 km deep · released about 240 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 2.6 (ml)
Depth
70 km below the surface
Felt
1 report · strongest reported intensity II
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1265 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 56.0347, -159.0955. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.6 14 km WNW of Chignik Lake, Alaska
  2. 1.5 34 km SSE of Perryville, Alaska
  3. 2.6 17 km NNE of Perryville, Alaska
  4. 1.8 7 km W of Perryville, Alaska
  5. 2.1 17 km NNW of Perryville, Alaska
  6. 2.9 34 km SSE of Perryville, Alaska
  7. 1.6 17 km NE of Perryville, Alaska
  8. 2.4 38 km ESE of Perryville, Alaska
  9. 2.1 35 km WNW of Chignik Lake, Alaska
  10. 1.8 24 km E of Perryville, Alaska
  11. 1.8 31 km N of Ivanof Bay, Alaska
  12. 2.4 9 km ENE of Ivanof Bay, Alaska
  13. 1.9 36 km SE of Perryville, Alaska
  14. 2.2 20 km ESE of Perryville, Alaska
  15. 2.4 9 km NNW of Perryville, 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 2018-10-10 — it released about 4,000 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.