QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

138 km SW of Nikolski, Alaska

Yes. A magnitude 3.0 earthquake was recorded 138 km SW of Nikolski, Alaska at 04:11 UTC on 2017-11-04, 66 km deep.

· 66 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
66 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1192 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 it was probably too small to be felt, even directly above it. 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 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.

For this area

The largest earthquake within 50 km since 2016 was M 5.2 on 2017-05-19 — about 2,000 times the energy of this one.

Before 2016, the USGS record lists 75 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.6 135 km SW of Nikolski, Alaska · 37 km SE of this epicentre
  2. 6.2 179 km SW of Nikolski, Alaska · 48 km SSW of this epicentre
  3. 6.1 Fox Islands, Aleutian Islands, Alaska · 49 km SSW of this epicentre
  4. 6.0 128 km SW of Nikolski, Alaska · 20 km ESE of this epicentre
  5. 6.0 164 km WSW of Nikolski, Alaska · 45 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 52.1961, -170.5058. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.7 148 km WSW of Nikolski, Alaska
  2. 2.0 92 km WSW of Nikolski, Alaska
  3. 2.0 133 km SW of Nikolski, Alaska
  4. 3.0 129 km SW of Nikolski, Alaska
  5. 3.9 134 km SW of Nikolski, Alaska
  6. 3.6 111 km WSW of Nikolski, Alaska
  7. 3.0 142 km SW of Nikolski, Alaska
  8. 4.0 Fox Islands, Aleutian Islands, Alaska
  9. 2.8 150 km SW of Nikolski, Alaska
  10. 2.2 127 km SW of Nikolski, Alaska
  11. 3.0 127 km WSW of Nikolski, Alaska
  12. 2.7 129 km SW of Nikolski, Alaska
  13. 2.4 104 km SW of Nikolski, Alaska
  14. 3.0 113 km SW of Nikolski, Alaska
  15. 3.3 134 km SW of Nikolski, 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.