QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

Earthquake near Nikiski, AK

No earthquake was likely felt in Nikiski in the 24 hours to 2:15 pm AKST (23:15 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 2.8 earthquake was recorded 48 km (30 mi) north-northeast of Nikiski, AK, at 2:59 am AKDT on 5 July 2017 (10:59 UTC), 67 km deep.

USGS: 3 km SSW of Beluga, Alaska

65 km (41 mi) W of Anchorage, AK

2:59 am AKDT, Jul 5, 2017 · · 67 km deep · released about 480 lb of TNT

Every earthquake near Nikiski Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 98 kmKenai Peninsula Borough 106 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
2:59 am AKDT on 5 July 2017 ()
Where
48 km (30 mi) north-northeast of Nikiski, AK · earthquakes near Nikiski
Magnitude
M 2.8 (ml)
Depth
67 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 98 km E
Nearest mapped fault
Granite Point anticline (Cook Inlet folds), 11 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 1193 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, 48 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 19 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 Southern Alaska · 2 km SSW of this epicentre
  2. 6.8 4 km NE of Beluga, Alaska · 8 km NNE of this epicentre
  3. 6.7 6 km WNW of Nikiski, Alaska · 47 km SSW of this epicentre
  4. 6.4 19 km SSE of Tyonek, Alaska · 24 km S of this epicentre
  5. 6.0 Southern Alaska · 33 km WNW 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 61.1103, -151.0967. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 98 km (61 mi) E earthquakes near Anchorage Municipality
Kenai Peninsula Borough, AK 106 km (66 mi) SW earthquakes near Kenai 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. 1.5 Southern Alaska
  2. 1.6 9 km W of Point Possession, Alaska
  3. 2.0 10 km WSW of Tyonek, Alaska
  4. 1.7 15 km N of Nikiski, Alaska
  5. 1.9 16 km ESE of Beluga, Alaska
  6. 1.6 27 km NW of Beluga, Alaska
  7. 2.5 18 km NE of Beluga, Alaska
  8. 4.1 4 km ESE of Nikiski, Alaska
  9. 2.3 12 km W of Tyonek, Alaska
  10. 3.3 13 km W of Tyonek, Alaska
  11. 1.5 11 km WNW of Point Possession, Alaska
  12. 2.5 15 km ENE of Beluga, Alaska
  13. 2.3 4 km SW of Point Possession, Alaska
  14. 2.3 25 km WSW of Tyonek, Alaska
  15. 1.5 27 km SSW of Susitna, 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.