Earthquake · reviewed by a seismologist
M 1.6ml
Alaska Peninsula
Yes. A magnitude 1.6 earthquake was recorded in the Alaska Peninsula, at 9:28 am AKDT on 25 July 2023 (17:28 UTC), 11 km deep.
- When
- Magnitude
- M 1.6 (ml)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1199 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 4 km (2 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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
- Around the size people start to feel M 3.0 130× the energy of this one
- This earthquake M 1.6 about 7.6 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 7.8 on 2020-07-22 — about 2,000,000,000 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 55.3046, -159.0623. Map © OpenStreetMap contributors.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 2.9 64 km ESE of Sand Point, Alaska
- 2.5 80 km ESE of Sand Point, Alaska
- 1.8 59 km E of Sand Point, Alaska
- 2.8 63 km E of Sand Point, Alaska
- 2.1 68 km SSE of Perryville, Alaska
- 2.2 64 km S of Ivanof Bay, Alaska
- 2.2 58 km SSE of Perryville, Alaska
- 1.9 36 km SE of Perryville, Alaska
- 2.0 47 km S of Ivanof Bay, Alaska
- 2.0 70 km SSE of Perryville, Alaska
- 1.8 52 km S of Ivanof Bay, Alaska
- 2.0 49 km SSE of Ivanof Bay, Alaska
- 2.5 55 km S of Ivanof Bay, Alaska
- 1.8 Alaska Peninsula
- 1.8 67 km ESE 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.
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.