QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

Earthquake near Tanaina, AK

No earthquake was likely felt in Tanaina in the 24 hours to 5:07 pm AKST (02:07 UTC). The last one was M 3.6, 59 km (37 mi) N, at 9:16 am AKDT on 27 October 2026, estimated intensity II (weak) in town; 17 felt reports to USGS. Every earthquake near Tanaina

This page: a magnitude 2.3 earthquake was recorded 9 km (5 mi) north-northwest of Tanaina, AK, at 2:25 pm AKDT on 16 July 2025 (22:25 UTC), 18 km deep. 1 person has reported feeling it to USGS.

USGS: 8 km NNW of Tanaina, Alaska

57 km (36 mi) NNE of Anchorage, AK

2:25 pm AKDT, Jul 16, 2025 · · 18 km deep · released about 85 lb of TNT

Every earthquake near Tanaina Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 59 kmMatanuska-Susitna Borough 63 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
2:25 pm AKDT on 16 July 2025 ()
Where
9 km (5 mi) north-northwest of Tanaina, AK · earthquakes near Tanaina
Magnitude
M 2.3 (ml)
Depth
18 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Anchorage Municipality, 59 km SSE
Nearest mapped fault
Castle Mountain fault, 2 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 406 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 8 km (5 mi) from the epicentre. In Tanaina, 9 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.

Likely felt in: Tanaina 9 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 7.1 on 2018-11-30 — about 16,000,000 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.9 23 km NE of Willow, Alaska · 27 km NNW of this epicentre
  2. 5.8 14 km NNE of Fishhook, Alaska · 27 km NE of this epicentre
  3. 5.6 11 km NW of Big Lake, Alaska · 35 km WSW of this epicentre
  4. 5.5 2 km ENE of Eagle River, Alaska · 41 km S of this epicentre
  5. 5.5 9 km E of Susitna, Alaska · 48 km WSW 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 61.6964, -149.5015. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 59 km (37 mi) SSE earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 63 km (39 mi) N earthquakes near Matanuska-Susitna Borough

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

Aftershocks so far

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

  1. 2.1 3 km NNE of Point MacKenzie, Alaska
  2. 1.6 25 km ESE of Susitna North, Alaska
  3. 1.8 21 km N of Fishhook, Alaska
  4. 1.7 5 km ESE of Big Lake, Alaska
  5. 2.5 4 km N of Point MacKenzie, Alaska
  6. 1.6 16 km WNW of Fishhook, Alaska
  7. 1.5 4 km E of Big Lake, Alaska
  8. 1.7 3 km NW of Tanaina, Alaska
  9. 1.6 8 km NNE of Point MacKenzie, Alaska
  10. 2.7 8 km NNE of Point MacKenzie, Alaska
  11. 1.8 17 km WNW of Fishhook, Alaska
  12. 1.8 13 km SSE of Susitna North, Alaska
  13. 1.7 20 km SSE of Susitna North, Alaska
  14. 2.5 5 km NW of Meadow Lakes, Alaska
  15. 2.0 4 km SSW of Knik, 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.