QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

219.8 km N of Sand Point, AK

Yes. A magnitude 2.4 earthquake was recorded 219.8 km N of Sand Point, AK at 14:27 UTC on 2020-11-02, 11 km deep.

· 11 km deep · released about 120 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 2.4 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest mapped fault
Alaska-Aleutian subduction zone, 24 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2186 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 18 km (11 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 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 in our catalogue was M 5.5 on 2020-07-05 — about 45,000 times the energy of this one.

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 53.3686, -160.2303. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.2 238 km S of Sand Point, Alaska
  2. 2.6 244 km SSE of King Cove, Alaska
  3. 2.7 229 km S of Sand Point, Alaska
  4. 2.3 218 km S of Sand Point, Alaska
  5. 3.6 193 km S of Sand Point, Alaska
  6. 2.8 south of Alaska
  7. 2.3 215 km SSE of King Cove, Alaska
  8. 2.3 220 km S of Sand Point, Alaska
  9. 2.7 227 km S of Sand Point, Alaska
  10. 2.1 219 km S of Sand Point, Alaska
  11. 2.5 236 km S of Sand Point, Alaska
  12. 3.8 237 km S of Sand Point, Alaska
  13. 3.1 234 km S of Sand Point, Alaska
  14. 5.4 219 km S of Sand Point, Alaska
  15. 2.7 223 km SSE of King Cove, 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.