Earthquake · automatic estimate, may change
M 2.4ml
Earthquake near Anchorage, AK
No earthquake was likely felt in Anchorage in the 24 hours to 3:45 am AKST (12:45 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 2.4 earthquake was recorded 20 km (12 mi) north-northwest of Anchorage, AK, at 5:59 pm AKDT on 28 June 2021 (01:59 UTC), 20 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 6 km W of Point MacKenzie, Alaska
20 km (12 mi) NNW of Anchorage, AK
- When
- 5:59 pm AKDT on 28 June 2021 ()
- Where
- 20 km (12 mi) north-northwest of Anchorage, AK · earthquakes near Anchorage
- Magnitude
- M 2.4 (ml)
- Depth
- 20 km below the surface
- Felt
- no reports yet
- Nearest
- Anchorage Municipality, 49 km ESE
- Nearest mapped fault
- Castle Mountain fault, 20 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 1891 days ago
Earthquake alerts for Anchorage, AK
Get a notification in this browser when USGS records an earthquake near Anchorage, AK. No account or email needed.
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 7 km (4 mi) from the epicentre. In Anchorage, 20 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.
Earthquakes near other towns within 30 km: Big Lake, Elmendorf Air Force Base, Eagle River.
How big was it?
This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
- Magna, Utah 2020 M 5.7 89,000× the energy of this one
- Around the size people start to feel M 3.0 7.9× the energy of this one
- This earthquake M 2.4 about 120 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 7.1 on 2018-11-30 — about 11,000,000 times the energy of this one.
Before 2016, the USGS record lists 25 earthquakes of M5 or more within 50 km; the five largest:
- 5.8 27 km N of Beluga, Alaska · 49 km W of this epicentre
- 5.8 20 km ENE of Beluga, Alaska · 38 km WSW of this epicentre
- 5.6 11 km NW of Big Lake, Alaska · 24 km N of this epicentre
- 5.6 5 km N of Susitna, Alaska · 33 km NW of this epicentre
- 5.5 2 km ENE of Eagle River, Alaska · 31 km E 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 61.3671, -150.1044. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Anchorage Municipality, AK | 49 km (30 mi) | ESE | earthquakes near Anchorage Municipality |
| Matanuska-Susitna Borough, AK | 105 km (65 mi) | NNE | earthquakes near Matanuska-Susitna Borough |
| Kenai Peninsula Borough, AK | 164 km (102 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
59 earthquakes have been recorded within 50 km since this one.
- 2.3 3 km SSW of Susitna, Alaska
- 1.8 3 km NW of Point MacKenzie, Alaska
- 1.7 4 km SSE of Big Lake, Alaska
- 1.8 6 km NNE of Point MacKenzie, Alaska
- 1.6 16 km WNW of Point MacKenzie, Alaska
- 1.8 1 km NNW of Elmendorf Air Force Base, Alaska
- 1.9 12 km SSE of Elmendorf Air Force Base, Alaska
- 2.3 10 km SW of Susitna, Alaska
- 2.2 5 km NNW of Point MacKenzie, Alaska
- 1.8 7 km WSW of Anchorage, Alaska
- 1.9 23 km WSW of Anchorage, Alaska
- 1.6 7 km WNW of Point MacKenzie, Alaska
- 1.5 19 km NE of Point Possession, Alaska
- 1.5 16 km WNW of Willow, Alaska
- 1.9 8 km WSW of Big Lake, 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.