QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

56 km ENE of Ferry, Alaska

Yes. A magnitude 1.8 earthquake was recorded 56 km ENE of Ferry, Alaska, at 3:53 am AKDT on 9 July 2022 (11:53 UTC), 8.1 km deep.

· 8.1 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fairbanks North Star Borough 91 kmDenali Borough 112 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
Magnitude
M 1.8 (ml)
Depth
8.1 km below the surface
Felt
no reports yet
Nearest
Fairbanks North Star Borough, 91 km NE
Nearest mapped fault
Northern Foothills thrust fault (Northern Foothills fold and thrust belt), 3 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 1539 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 11 km (7 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 4 earthquakes of M5 or more within 50 km:

  1. 7.1 Central Alaska · 29 km WSW of this epicentre
  2. 6.4 23 km ENE of Ferry, Alaska · 33 km WSW of this epicentre
  3. 6.1 35 km E of Healy, Alaska · 34 km SSW of this epicentre
  4. 6.0 39 km SW of Salcha, Alaska · 29 km ENE 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 64.1896, -148.0360. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Fairbanks North Star Borough, AK 91 km (57 mi) NE earthquakes near Fairbanks North Star Borough
Denali Borough, AK 112 km (70 mi) WSW earthquakes near Denali Borough

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

Aftershocks so far

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

  1. 1.7 47 km SSW of South Van Horn, Alaska
  2. 1.6 23 km E of Healy, Alaska
  3. 1.7 59 km E of Clear, Alaska
  4. 2.3 58 km SW of Salcha, Alaska
  5. 1.5 61 km E of Denali Park, Alaska
  6. 1.7 22 km ENE of Denali Park, Alaska
  7. 1.5 33 km E of Healy, Alaska
  8. 1.5 26 km E of Denali Park, Alaska
  9. 2.1 40 km ESE of Nenana, Alaska
  10. 2.0 40 km ESE of Nenana, Alaska
  11. 1.5 21 km E of Healy, Alaska
  12. 1.8 30 km SW of North Pole, Alaska
  13. 3.4 24 km ENE of Healy, Alaska
  14. 2.1 Central Alaska
  15. 1.6 26 km SSW of South Van Horn, 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.