Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Girdwood, AK
No earthquake was likely felt in Girdwood in the 24 hours to 4:37 am AKST (13:37 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 1.7 earthquake was recorded 34 km (21 mi) south-southwest of Girdwood, AK, at 3:34 pm AKDT on 16 August 2025 (23:34 UTC), 9.6 km deep.
USGS: 20 km N of Moose Pass, Alaska
66 km (41 mi) SSE of Anchorage, AK
- When
- 3:34 pm AKDT on 16 August 2025 ()
- Where
- 34 km (21 mi) south-southwest of Girdwood, AK · earthquakes near Girdwood
- Magnitude
- M 1.7 (ml)
- Depth
- 9.6 km below the surface
- Felt
- no reports yet
- Nearest
- Anchorage Municipality, 57 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 395 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, people at rest would likely notice it out to about 8 km (5 mi) from the epicentre. In Girdwood, 34 km away, the estimate is intensity I (not felt). 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 89× the energy of this one
- This earthquake M 1.7 about 11 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 4.4 on 2022-07-12 — about 11,000 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 5.7 13 km S of Girdwood, Alaska · 22 km NE of this epicentre
- 5.6 17 km W of Whittier, Alaska · 25 km ENE of this epicentre
- 5.3 16 km WSW of Whittier, Alaska · 26 km ENE of this epicentre
- 5.1 16 km WNW of Hope, Alaska · 44 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 60.6647, -149.4304. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Anchorage Municipality, AK | 57 km (36 mi) | N | earthquakes near Anchorage Municipality |
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.
- 1.8 11 km E of Crown Point, Alaska
- 1.9 3 km SE of Hope, Alaska
- 2.2 17 km NW of Girdwood, Alaska
- 2.3 18 km SW of Whittier, Alaska
- 1.7 24 km S of Hope, Alaska
- 1.9 17 km WNW of Hope, Alaska
- 2.1 17 km NNW of Moose Pass, Alaska
- 2.1 7 km WSW of Girdwood, Alaska
- 2.0 3 km WNW of Sunrise, Alaska
- 2.0 5 km W of Cooper Landing, Alaska
- 1.9 17 km WSW of Hope, Alaska
- 1.8 12 km NNW of Girdwood, Alaska
- 2.1 14 km SW of Hope, Alaska
- 1.8 8 km SW of Girdwood, Alaska
- 2.2 9 km SE of Girdwood, 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
- 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.