QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0ml

58 km S of False Pass, Alaska

Yes. A magnitude 2.0 earthquake was recorded 58 km S of False Pass, Alaska, at 11:51 pm AKDT on 13 October 2020 (07:51 UTC), 89 km deep.

· 89 km deep · released about 30 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 2.0 (ml)
Depth
89 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 141 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2215 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause 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 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 350,000× the energy of this one
  3. Around the size people start to feel M 3.0 32× the energy of this one
  4. This earthquake M 2.0 about 30 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 4.9 on 2020-05-09 — about 22,000 times the energy of this one.

Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.5 47 km SE of False Pass, Alaska · 49 km ENE of this epicentre
  2. 6.5 79 km SW of False Pass, Alaska · 42 km W of this epicentre
  3. 6.2 102 km SSW of False Pass, Alaska · 48 km SW of this epicentre
  4. 6.0 96 km SSW of False Pass, Alaska · 39 km SSW of this epicentre
  5. 5.8 85 km SW of False Pass, Alaska · 44 km WSW 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 54.3320, -163.5225. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aleutians East Borough, AK 141 km (88 mi) NE earthquakes near Aleutians East Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.5 42 km SSW of False Pass, Alaska
  2. 1.7 27 km SSE of False Pass, Alaska
  3. 3.1 39 km SSE of False Pass, Alaska
  4. 2.1 42 km SE of False Pass, Alaska
  5. 2.4 96 km S of False Pass, Alaska
  6. 2.3 95 km S of False Pass, Alaska
  7. 3.2 62 km S of False Pass, Alaska
  8. 2.3 24 km S of False Pass, Alaska
  9. 1.9 22 km SSE of False Pass, Alaska
  10. 1.8 18 km SSE of False Pass, Alaska
  11. 2.3 47 km WSW of False Pass, Alaska
  12. 2.1 102 km S of False Pass, Alaska
  13. 2.5 95 km S of False Pass, AK
  14. 3.0 84 km S of False Pass, Alaska
  15. 2.0 88 km S of False Pass, 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.