Earthquake · reviewed by a seismologist
M 7.2mww
2023 Sand Point, Alaska Earthquake
- When
- Magnitude
- M 7.2 (mww)
- Depth
- 25 km below the surface
- Felt
- 165 reports · strongest reported intensity VII
- Measured shaking
- intensity VII (ShakeMap)
- USGS impact alert
- green
- Tsunami
- USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
- Nearest
- Aleutians East Borough, 123 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 438 days ago
This was a major earthquake. Serious damage is likely near the epicentre. Follow official information from USGS and local authorities. 165 people have reported feeling it to USGS.
How big was it?
This earthquake released about 950 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 8.2 would have released about 32 times as much.
- Great Alaska earthquake 1964 M 9.2 1,000× the energy of this one
- Tōhoku, Japan 2011 M 9.1 710× the energy of this one
- San Francisco 1906 M 7.9 11× the energy of this one
- This earthquake M 7.2 about 950 kilotons of TNT
- Ridgecrest, California 2019 M 7.1 this one released 1.4× more
- Loma Prieta, California 1989 M 6.9 this one released 2.8× 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.
Where
Epicentre 54.3926, -160.7620. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Aleutians East Borough, AK | 123 km (77 mi) | SE of here | 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.
- 2.9 86 km SSW of Sand Point, Alaska
- 3.1 85 km SSW of Sand Point, Alaska
- 4.0 Alaska Peninsula
- 2.3 123 km S of Sand Point, Alaska
- 2.3 110 km S of Sand Point, Alaska
- 3.2 82 km SSW of Sand Point, Alaska
- 3.0 114 km S of Sand Point, Alaska
- 4.2 Alaska Peninsula
- 4.0 118 km S of Sand Point, Alaska
- 3.4 120 km S of Sand Point, Alaska
- 3.1 80 km ESE of King Cove, Alaska
- 4.7 91 km SSW of Sand Point, Alaska
- 3.4 119 km S of Sand Point, Alaska
- 2.2 96 km SSW of Sand Point, Alaska
- 2.2 73 km SSW of Sand 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.
For this area
The largest earthquake within 50 km in our catalogue was M 5.8 on 2018-07-19.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.