Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Seward, AK
No earthquake was likely felt in Seward in the 24 hours to 3:49 am AKST (12:49 UTC). The last one was M 4.3, 83 km (52 mi) W, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Seward
This page: a magnitude 2.5 earthquake was recorded 2 km (2 mi) northwest of Seward, AK, at 7:42 am AKST on 24 November 2020 (16:42 UTC), 17 km deep.
USGS: 2 km NW of Seward, Alaska
- When
- 7:42 am AKST on 24 November 2020 ()
- Where
- 2 km (2 mi) northwest of Seward, AK · earthquakes near Seward
- Magnitude
- M 2.5 (ml)
- Depth
- 17 km below the surface
- Felt
- no reports yet
- Nearest
- Anchorage Municipality, 118 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2109 days ago
Earthquake alerts for Seward, 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 14 km (9 mi) from the epicentre. In Seward, 2 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.
Likely felt in: Seward 2 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
- Magna, Utah 2020 M 5.7 63,000× the energy of this one
- Around the size people start to feel M 3.0 5.6× the energy of this one
- This earthquake M 2.5 about 170 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 6 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 3 km SW of Bear Creek, Alaska · 4 km NE of this epicentre
- 6.3 37 km SSE of Lowell Point, Alaska · 43 km SSE of this epicentre
- 5.9 33 km SSE of Lowell Point, Alaska · 39 km SSE of this epicentre
- 5.8 33 km ESE of Bear Creek, Alaska · 38 km E of this epicentre
- 5.4 12 km ESE of Lowell Point, Alaska · 17 km SE 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 60.1184, -149.4779. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Anchorage Municipality, AK | 118 km (73 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.
- 1.6 30 km ESE of Lowell Point, Alaska
- 2.1 12 km ESE of Primrose, Alaska
- 1.6 20 km ESE of Lowell Point, Alaska
- 2.1 17 km E of Moose Pass, Alaska
- 2.0 19 km E of Crown Point, Alaska
- 1.6 13 km ESE of Lowell Point, Alaska
- 1.5 16 km ESE of Lowell Point, Alaska
- 2.6 14 km ESE of Lowell Point, Alaska
- 1.7 5 km E of Cooper Landing, Alaska
- 4.4 19 km ENE of Primrose, Alaska
- 1.5 6 km SSE of Lowell Point, Alaska
- 3.0 22 km E of Crown Point, Alaska
- 1.5 16 km SE of Lowell Point, Alaska
- 2.4 46 km SSW of Lowell Point, Alaska
- 3.1 19 km E of Crown Point, 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.