Earthquake · reviewed by a seismologist
M 1.2ml
Earthquake near Girdwood, AK
No earthquake was likely felt in Girdwood in the 24 hours to 10:29 am AKST (19:29 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 1.2 earthquake was recorded 38 km (24 mi) northeast of Girdwood, AK, at 10:06 pm AKDT on 31 October 2026 (06:06 UTC), 37 km deep.
USGS: 36 km SSE of Knik River, Alaska
69 km (43 mi) E of Anchorage, AK
- When
- 10:06 pm AKDT on 31 October 2026 ()
- Where
- 38 km (24 mi) northeast of Girdwood, AK · earthquakes near Girdwood
- Magnitude
- M 1.2 (ml)
- Depth
- 37 km below the surface
- Felt
- no reports yet
- Nearest
- Anchorage Municipality, 36 km W
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 15 days ago
Earthquake alerts for Girdwood, AK
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. 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 1.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 7,900,000× the energy of this one
- Magna, Utah 2020 M 5.7 5,600,000× the energy of this one
- Around the size people start to feel M 3.0 500× the energy of this one
- This earthquake M 1.2 about 1.9 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 4.2 on 2020-06-18 — about 32,000 times the energy of this one.
Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 57 km ENE of Whittier, Alaska · 48 km ESE of this epicentre
- 6.4 22 km ENE of Whittier, Alaska · 38 km SSE of this epicentre
- 6.3 27 km ENE of Whittier, Alaska · 36 km SSE of this epicentre
- 6.0 21 km N of Whittier, Alaska · 22 km S of this epicentre
- 5.7 13 km S of Girdwood, Alaska · 49 km SW 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 61.1620, -148.6160. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Anchorage Municipality, AK | 36 km (22 mi) | W | earthquakes near Anchorage Municipality |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
14 earthquakes have been recorded within 50 km since this one.
- 0.6 45 km ESE of Knik River, Alaska
- 1.2 45 km ESE of Knik River, Alaska
- 1.4 30 km NNE of Whittier, Alaska
- 2.1 3 km NE of Girdwood, Alaska
- 0.7 33 km NNE of Whittier, Alaska
- 2.0 7 km NE of Knik River, Alaska
- 1.4 51 km NE of Whittier, Alaska
- 1.5 20 km E of Whittier, Alaska
- 2.1 19 km SSW of Knik River, Alaska
- 1.1 21 km N of Whittier, Alaska
- 1.8 43 km ESE of Knik River, Alaska
- 1.5 31 km NNE of Whittier, Alaska
- 2.3 11 km W of Whittier, Alaska
- 1.1 34 km NE 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| review status | automatic | reviewed | |
| location | 45 km ESE of Knik River, Alaska | 36 km SSE of Knik River, Alaska | |
| longitude | -148.15 | -148.62 | |
| latitude | 61.28 | 61.16 | |
| depth | 5 | 37 |
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.