QuakeIndex

Earthquake · automatic estimate, may change

M 3.0ml

Earthquake near Girdwood, AK

No earthquake was likely felt in Girdwood in the 24 hours to 4:57 am AKST (13:57 UTC). The last one was M 1.8, 8 km (5 mi) SE, at 10:01 am AKDT on 19 October 2026, estimated intensity II (weak) in town. Every earthquake near Girdwood

This page: a magnitude 3.0 earthquake was recorded 50 km (31 mi) east-southeast of Girdwood, AK, at 4:30 am AKDT on 4 October 2025 (12:30 UTC), 8.8 km deep. 1 person has reported feeling it to USGS. The magnitude and location are an automatic first estimate and may change.

USGS: 19 km E of Whittier, Alaska

99 km (61 mi) ESE of Anchorage, AK

4:30 am AKDT, Oct 4, 2025 · · 8.8 km deep · released about 950 lb of TNT

Every earthquake near Girdwood Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 69 kmChugach Census Area 120 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
4:30 am AKDT on 4 October 2025 ()
Where
50 km (31 mi) east-southeast of Girdwood, AK · earthquakes near Girdwood
Magnitude
M 3.0 (ml)
Depth
8.8 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Anchorage Municipality, 69 km NW
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 329 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 36 km (22 mi) from the epicentre. In Girdwood, 50 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.6 57 km ENE of Whittier, Alaska · 43 km NE of this epicentre
  2. 6.4 22 km ENE of Whittier, Alaska · 11 km N of this epicentre
  3. 6.3 27 km ENE of Whittier, Alaska · 15 km NNE of this epicentre
  4. 6.0 21 km N of Whittier, Alaska · 31 km NW of this epicentre
  5. 5.7 13 km S of Girdwood, Alaska · 47 km W 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 60.7580, -148.3308. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 69 km (43 mi) NW earthquakes near Anchorage Municipality
Chugach Census Area, AK 120 km (74 mi) ESE earthquakes near Chugach Census Area

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

Aftershocks so far

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

  1. 1.7 22 km SSE of Whittier, Alaska
  2. 2.2 47 km N of Chenega, Alaska
  3. 3.1 23 km E of Whittier, Alaska
  4. 1.6 7 km WSW of Whittier, Alaska
  5. 2.2 9 km ESE of Whittier, Alaska
  6. 1.6 37 km NNE of Whittier, Alaska
  7. 2.1 35 km SSE of Whittier, Alaska
  8. 2.2 33 km S of Whittier, Alaska
  9. 2.1 31 km N of Chenega, Alaska
  10. 1.7 49 km NE of Whittier, Alaska
  11. 2.0 35 km N of Chenega, Alaska
  12. 1.8 30 km S of Whittier, Alaska
  13. 1.9 44 km ESE of Whittier, Alaska
  14. 1.5 38 km SE of Knik River, Alaska
  15. 1.6 36 km SSE of Whittier, 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.