Earthquake · reviewed by a seismologist
M 3.5ml
Earthquake near Anchorage, AK
No earthquake was likely felt in Anchorage in the 24 hours to 3:40 am AKST (12:40 UTC). The last one was M 3.5, 39 km (24 mi) SSW, at 4:48 pm AKDT on 27 October 2026, estimated intensity II (weak) in town; 98 felt reports to USGS. Every earthquake near Anchorage
This page: a magnitude 3.5 earthquake was recorded 21 km (13 mi) west-southwest of Anchorage, AK, at 8:29 am AKST on 27 February 2024 (17:29 UTC), 62 km deep. 224 people have reported feeling it to USGS.
USGS: 20 km WSW of Anchorage, Alaska
21 km (13 mi) WSW of Anchorage, AK
- When
- 8:29 am AKST on 27 February 2024 ()
- Where
- 21 km (13 mi) west-southwest of Anchorage, AK · earthquakes near Anchorage
- Magnitude
- M 3.5 (ml)
- Depth
- 62 km below the surface
- Felt
- 224 reports · strongest reported intensity III
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Anchorage Municipality, 52 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 917 days ago
Earthquake alerts for Anchorage, 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 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 15 km (9 mi) from the epicentre. In Anchorage, 21 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 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 63,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
- Magna, Utah 2020 M 5.7 2,000× the energy of this one
- This earthquake M 3.5 about 2.7 tons of TNT
- Around the size people start to feel M 3.0 this one released 5.6× 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 7.1 on 2018-11-30 — about 250,000 times the energy of this one.
Before 2016, the USGS record lists 21 earthquakes of M5 or more within 50 km; the five largest:
- 6.8 Southern Alaska · 47 km W of this epicentre
- 6.8 4 km NE of Beluga, Alaska · 42 km W of this epicentre
- 5.8 20 km ENE of Beluga, Alaska · 30 km WNW of this epicentre
- 5.6 11 km NW of Big Lake, Alaska · 50 km N of this epicentre
- 5.5 2 km ENE of Eagle River, Alaska · 44 km ENE 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 61.1346, -150.2437. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Anchorage Municipality, AK | 52 km (32 mi) | E | earthquakes near Anchorage Municipality |
| Kenai Peninsula Borough, AK | 142 km (88 mi) | SW | earthquakes near Kenai Peninsula Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
49 earthquakes have been recorded within 50 km since this one.
- 1.7 5 km WNW of Point MacKenzie, Alaska
- 1.8 20 km SW of Susitna, Alaska
- 1.5 8 km W of Big Lake, Alaska
- 1.5 20 km S of Susitna, Alaska
- 1.5 23 km SW of Anchorage, Alaska
- 1.6 30 km SW of Hope, Alaska
- 1.7 25 km NE of Point Possession, Alaska
- 2.0 5 km WNW of Point Possession, Alaska
- 2.2 4 km NNE of Point MacKenzie, Alaska
- 1.6 1 km E of Big Lake, Alaska
- 2.4 21 km SSW of Susitna, Alaska
- 1.5 1 km NE of Big Lake, Alaska
- 2.3 10 km SSW of Point MacKenzie, Alaska
- 1.5 12 km W of Point MacKenzie, Alaska
- 2.1 5 km WNW of Point MacKenzie, 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.