Earthquake · reviewed by a seismologist
M 2.8ml
Alaska Peninsula
Yes. A magnitude 2.8 earthquake was recorded in the Alaska Peninsula, at 9:08 pm AKDT on 3 October 2020 (05:08 UTC), 26 km deep.
- When
- Magnitude
- M 2.8 (ml)
- Depth
- 26 km below the surface
- Felt
- no reports yet
- Nearest
- Aleutians East Borough, 116 km WNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2162 days ago
Earthquake alerts for Sand Point, AK
Get a notification in this browser when USGS records an earthquake near Sand Point, 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 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 8 km (5 mi) from the epicentre. 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
- Magna, Utah 2020 M 5.7 22,000× the energy of this one
- Around the size people start to feel M 3.0 2× the energy of this one
- This earthquake M 2.8 about 480 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 in our catalogue was M 5.6 on 2020-07-29 — about 16,000 times the energy of this one.
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 54.8486, -160.3174. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Aleutians East Borough, AK | 116 km (72 mi) | WNW | earthquakes near Aleutians East Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 3.0 87 km SSE of Sand Point, Alaska
- 3.0 89 km SSE of Sand Point, Alaska
- 4.1 89 km SSE of Sand Point, Alaska
- 3.0 93 km SSE of Sand Point, Alaska
- 2.7 86 km SSE of Sand Point, Alaska
- 2.9 85 km SSE of Sand Point, Alaska
- 3.4 98 km SSE of Sand Point, Alaska
- 3.4 south of Alaska
- 3.3 85 km SSE of Sand Point, Alaska
- 3.0 88 km SSE of Sand Point, Alaska
- 4.9 97 km SSE of Sand Point, Alaska
- 3.4 75 km SE of Sand Point, Alaska
- 2.6 94 km SSE of Sand Point, Alaska
- 3.1 89 km SSE of Sand Point, Alaska
- 3.4 south of 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.