QuakeIndex

Earthquake · automatic estimate, may change

M 3.3ml

Earthquake near Healy, AK

No earthquake was likely felt in Healy in the 24 hours to 6:35 am AKST (15:35 UTC). The last one was M 2.7, 23 km (14 mi) NNE, at 4:13 pm AKST on 3 November 2026, estimated intensity II (weak) in town. Every earthquake near Healy

This page: a magnitude 3.3 earthquake was recorded 45 km (28 mi) east of Healy, AK, at 9:46 am AKDT on 29 October 2025 (17:46 UTC), 4.9 km deep. 1 person has reported feeling it to USGS. The magnitude and location are an automatic first estimate and may change.

USGS: 42 km E of Denali Park, Alaska

9:46 am AKDT, Oct 29, 2025 · · 4.9 km deep · released about 1.3 tons of TNT

Every earthquake near Healy Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Denali Borough 97 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
9:46 am AKDT on 29 October 2025 ()
Where
45 km (28 mi) east of Healy, AK · earthquakes near Healy
Magnitude
M 3.3 (ml)
Depth
4.9 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Denali Borough, 97 km W
Nearest mapped fault
Park Road fault (Northern Foothills fold and thrust belt), 12 km from its surface trace — near is not the same as on
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 290 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, people at rest would likely notice it out to about 52 km (32 mi) from the epicentre. In Healy, 45 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: Healy 45 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× more

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 4.4 on 2024-09-26 — about 45 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.9 2002 Denali Fault, Alaska Earthquake · 42 km SE of this epicentre
  2. 7.1 Central Alaska · 40 km NW of this epicentre
  3. 6.6 53 km ENE of Cantwell, Alaska · 31 km SSE of this epicentre
  4. 6.4 23 km ENE of Ferry, Alaska · 49 km NW of this epicentre
  5. 6.1 35 km E of Healy, Alaska · 15 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 63.7807, -148.0607. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Denali Borough, AK 97 km (61 mi) W earthquakes near Denali Borough
Fairbanks North Star Borough, AK 125 km (77 mi) NE earthquakes near Fairbanks North Star Borough

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

Aftershocks so far

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

  1. 1.5 69 km E of Denali Park, Alaska
  2. 2.0 61 km E of Healy, Alaska
  3. 1.5 54 km ENE of Cantwell, Alaska
  4. 1.9 45 km ESE of Denali Park, Alaska
  5. 1.9 21 km ENE of Cantwell, Alaska
  6. 2.1 21 km ENE of Cantwell, Alaska
  7. 2.4 21 km ENE of Cantwell, Alaska
  8. 2.1 22 km ENE of Cantwell, Alaska
  9. 1.5 35 km ENE of Ferry, Alaska
  10. 1.9 34 km ENE of Healy, Alaska
  11. 1.7 32 km ESE of Denali Park, Alaska
  12. 1.7 27 km ENE of Cantwell, Alaska
  13. 2.2 55 km E of Cantwell, Alaska
  14. 1.7 32 km ENE of Cantwell, Alaska
  15. 1.6 22 km E of Denali Park, 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.