QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

Earthquake near Nikiski, AK

No earthquake was likely felt in Nikiski in the 24 hours to 7:44 am AKST (16:44 UTC). The last one was M 4.3, 58 km (36 mi) SSE, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Nikiski

This page: a magnitude 3.0 earthquake was recorded 41 km (25 mi) north of Nikiski, AK, at 10:52 pm AKST on 9 December 2023 (07:52 UTC), 69 km deep. 1 person has reported feeling it to USGS.

USGS: 15 km W of Tyonek, Alaska

84 km (52 mi) WSW of Anchorage, AK

10:52 pm AKST, Dec 9, 2023 · · 69 km deep · released about 950 lb of TNT

Every earthquake near Nikiski Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kenai Peninsula Borough 90 kmAnchorage Municipality 116 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
10:52 pm AKST on 9 December 2023 ()
Where
41 km (25 mi) north of Nikiski, AK · earthquakes near Nikiski
Magnitude
M 3.0 (ml)
Depth
69 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Kenai Peninsula Borough, 90 km SSW
Nearest mapped fault
Granite Point anticline (Cook Inlet folds), 8 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 1000 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 it was probably too small to be felt, even directly above it. In Nikiski, 41 km away, the estimate is intensity II (weak). 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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 5.2 on 2017-05-30 — about 2,000 times the energy of this one.

Before 2016, the USGS record lists 19 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 Southern Alaska · 17 km ENE of this epicentre
  2. 6.8 4 km NE of Beluga, Alaska · 26 km ENE of this epicentre
  3. 6.7 6 km WNW of Nikiski, Alaska · 37 km S of this epicentre
  4. 6.4 19 km SSE of Tyonek, Alaska · 27 km SE of this epicentre
  5. 6.0 Southern Alaska · 23 km NW 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 61.0511, -151.4246. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 90 km (56 mi) SSW earthquakes near Kenai Peninsula Borough
Anchorage Municipality, AK 116 km (72 mi) E earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 1.7 17 km WNW of Tyonek, Alaska
  2. 1.5 29 km WSW of Susitna, Alaska
  3. 1.9 45 km NNW of Beluga, Alaska
  4. 1.6 44 km WSW of Tyonek, Alaska
  5. 1.6 27 km NNE of Beluga, Alaska
  6. 2.0 41 km W of Tyonek, Alaska
  7. 1.6 46 km NW of Beluga, Alaska
  8. 2.2 28 km NW of Nikiski, Alaska
  9. 1.5 40 km WNW of Beluga, Alaska
  10. 1.7 28 km W of Salamatof, Alaska
  11. 1.6 12 km WSW of Tyonek, Alaska
  12. 2.0 23 km WNW of Tyonek, Alaska
  13. 1.6 11 km SW of Tyonek, Alaska
  14. 1.6 27 km WSW of Tyonek, Alaska
  15. 1.5 14 km N of Nikiski, 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.