Earthquake · reviewed by a seismologist
M 2.3ml
Alaska Peninsula
Yes. A magnitude 2.3 earthquake was recorded in the Alaska Peninsula, at 10:09 am AKDT on 16 July 2023 (18:09 UTC), 19 km deep.
- When
- Magnitude
- M 2.3 (ml)
- Depth
- 19 km below the surface
- Felt
- no reports yet
- Nearest
- Aleutians East Borough, 117 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1213 days ago
Earthquake alerts for Sand Point, 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 6 km (4 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
- Magna, Utah 2020 M 5.7 130,000× the energy of this one
- Around the size people start to feel M 3.0 11× the energy of this one
- This earthquake M 2.3 about 85 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 7.2 on 2023-07-16 — about 22,000,000 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 54.5542, -160.6082. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Aleutians East Borough, AK | 117 km (73 mi) | NW | earthquakes near Aleutians East Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 2.3 76 km SSW of Sand Point, Alaska
- 1.5 88 km SSW of Sand Point, Alaska
- 2.8 Alaska Peninsula
- 1.6 87 km SSW of Sand Point, Alaska
- 1.7 Alaska Peninsula
- 2.9 121 km S of Sand Point, Alaska
- 1.8 124 km SSW of Sand Point, Alaska
- 1.6 93 km SSW of Sand Point, Alaska
- 1.6 92 km SSW of Sand Point, Alaska
- 1.6 72 km SSW of Sand Point, Alaska
- 1.6 87 km S of Sand Point, Alaska
- 1.6 93 km SSW of Sand Point, Alaska
- 1.6 70 km S of Sand Point, Alaska
- 1.6 69 km SSW of Sand Point, Alaska
- 3.2 103 km SE of King Cove, 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.