QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

Earthquake near Deltana, AK

USGS: 8 km WSW of Whitestone, Alaska

3:37 am AKDT, Apr 21, 2019 · · 11 km deep · released about 120 lb of TNT

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10 km30 km60 km120 km N Fairbanks North Star Borough 65 km
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
3:37 am AKDT on 21 April 2019 ()
Where
49 km (31 mi) WNW of Deltana, AK · earthquakes near Deltana
Magnitude
M 2.4 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Fairbanks North Star Borough, 65 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2590 days ago

A magnitude 2.4 earthquake was recorded 49 km (31 mi) WNW of Deltana, AK, at 3:37 am AKDT on 21 April 2019 (11:37 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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

  1. 6.2 30 km SSW of Fort Greely, Alaska · 49 km SSE 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 64.1158, -146.0618. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Fairbanks North Star Borough, AK 65 km (40 mi) NNW earthquakes near Fairbanks North Star Borough

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

Aftershocks so far

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

  1. 1.7 23 km ENE of Harding-Birch Lakes, Alaska
  2. 1.5 8 km NE of Big Delta, Alaska
  3. 1.6 29 km WSW of Delta Junction, Alaska
  4. 1.7 9 km SSW of Fort Greely, Alaska
  5. 1.7 12 km WSW of Fort Greely, Alaska
  6. 2.3 15 km WSW of Fort Greely, Alaska
  7. 1.6 16 km NNW of Whitestone, Alaska
  8. 1.5 15 km WSW of Fort Greely, Alaska
  9. 1.6 1 km SSE of Whitestone, Alaska
  10. 2.0 5 km WSW of Fort Greely, Alaska
  11. 1.7 3 km SW of Fort Greely, Alaska
  12. 2.6 4 km NE of Harding-Birch Lakes, Alaska
  13. 1.8 45 km WSW of Delta Junction, Alaska
  14. 1.7 9 km NNE of Harding-Birch Lakes, Alaska
  15. 1.9 10 km SSW of Fort Greely, 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.