QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

165 km ESE of Chignik, Alaska

Yes. A magnitude 3.2 earthquake was recorded 165 km ESE of Chignik, Alaska at 10:19 UTC on 2024-03-05, 6.1 km deep.

· 6.1 km deep · released about 1,900 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 3.2 (ml)
Depth
6.1 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 911 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 46 km (29 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× 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.

For this area

The largest earthquake within 50 km since 2016 was M 5.1 on 2022-09-20 — about 710 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.9 143 km ESE of Chignik, Alaska · 24 km W of this epicentre
  2. 6.9 171 km SW of Akhiok, Alaska · 10 km SSE of this epicentre
  3. 6.2 148 km SSW of Akhiok, Alaska · 44 km E of this epicentre
  4. 6.1 132 km E of Chignik, Alaska · 49 km NNW of this epicentre
  5. 6.1 118 km ESE of Chignik, Alaska · 46 km WNW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 55.8061, -155.9001. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.7 183 km SSW of Akhiok, Alaska
  2. 3.0 183 km SSW of Akhiok, Alaska
  3. 2.3 160 km ESE of Chignik, Alaska
  4. 2.5 142 km ESE of Chignik, Alaska
  5. 2.4 156 km SSW of Akhiok, Alaska
  6. 2.6 167 km ESE of Chignik, Alaska
  7. 2.7 139 km ESE of Chignik, Alaska
  8. 3.1 150 km SW of Akhiok, Alaska
  9. 2.2 131 km E of Chignik, Alaska
  10. 2.4 134 km ESE of Chignik, Alaska
  11. 1.9 137 km SW of Akhiok, Alaska
  12. 2.4 127 km ESE of Chignik, Alaska
  13. 2.5 147 km ESE of Chignik, Alaska
  14. 2.8 179 km SSW of Akhiok, Alaska
  15. 2.7 149 km SSW of Akhiok, 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.