QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

44 km SSW of Ugashik, Alaska

Yes. A magnitude 2.7 earthquake was recorded 44 km SSW of Ugashik, Alaska at 11:57 UTC on 2020-01-11, 12 km deep.

· 12 km deep · released about 340 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 2.7 (ml)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Lake and Peninsula Borough, 130 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2415 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 22 km (14 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 6.2 on 2016-04-02 — about 180,000 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.1 68 km S of Ugashik, Alaska · 32 km SE 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 57.1294, -157.5941. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lake and Peninsula Borough, AK 130 km (81 mi) NNE earthquakes near Lake and Peninsula 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. 1.7 50 km ENE of Port Heiden, Alaska
  2. 2.1 20 km ESE of Ugashik, Alaska
  3. 1.9 60 km SSE of Ugashik, Alaska
  4. 2.1 59 km SSE of Ugashik, Alaska
  5. 2.9 53 km E of Port Heiden, Alaska
  6. 1.8 59 km E of Port Heiden, Alaska
  7. 2.1 13 km E of Ugashik, Alaska
  8. 2.0 74 km NE of Chignik, Alaska
  9. 1.7 45 km ESE of Port Heiden, Alaska
  10. 2.5 38 km SSW of Ugashik, Alaska
  11. 1.5 50 km E of Port Heiden, Alaska
  12. 1.9 Alaska Peninsula
  13. 1.9 27 km SE of Ugashik, Alaska
  14. 2.3 46 km SSW of Ugashik, Alaska
  15. 1.8 61 km E of Port Heiden, 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.