Earthquake · reviewed by a seismologist
M 5.1mww
59 km E of Egegik, Alaska
Yes. A magnitude 5.1 earthquake was recorded 59 km E of Egegik, Alaska at 04:04 UTC on 2025-04-01, 13 km deep. 67 people have reported feeling it to USGS.
- When
- Magnitude
- M 5.1 (mww)
- Depth
- 13 km below the surface
- Felt
- 67 reports · strongest reported intensity IV
- Measured shaking
- intensity VI (ShakeMap)
- Tsunami
- USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
- Nearest
- Lake and Peninsula Borough, 2 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 226 days ago
This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.
At this magnitude and depth, people at rest would likely notice it out to about 205 km (127 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 670 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 250× the energy of this one
- Mineral, Virginia 2011 M 5.8 11× the energy of this one
- Magna, Utah 2020 M 5.7 7.9× the energy of this one
- This earthquake M 5.1 about 670 tons of TNT
- Around the size people start to feel M 3.0 this one released 1,400× 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.
For this area
The largest earthquake within 50 km since 2016 was M 5.5 on 2016-07-23 — about 4 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 6.6 19 km SSE of King Salmon, Alaska · 46 km NNW of this epicentre
- 5.4 48 km SE of Egegik, Alaska · 36 km SW of this epicentre
- 5.4 35 km SE of Egegik, Alaska · 38 km WSW of this epicentre
- 5.3 37 km S of King Salmon, Alaska · 31 km NNW of this epicentre
- 5.2 67 km ESE of Egegik, Alaska · 25 km S 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 58.1204, -156.3782. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake and Peninsula Borough, AK | 2 km (2 mi) | WSW | earthquakes near Lake and Peninsula Borough |
| Bristol Bay Borough, AK | 77 km (48 mi) | NNW | earthquakes near Bristol Bay Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 2.1 66 km SE of King Salmon, Alaska
- 1.7 55 km ESE of King Salmon, Alaska
- 1.5 68 km ENE of Ugashik, Alaska
- 2.4 60 km E of Egegik, Alaska
- 2.0 33 km SE of King Salmon, Alaska
- 1.6 37 km SE of King Salmon, Alaska
- 1.5 73 km ESE of Egegik, Alaska
- 2.1 73 km ESE of Egegik, Alaska
- 2.5 65 km ENE of Ugashik, Alaska
- 2.3 67 km ENE of Ugashik, Alaska
- 1.5 56 km E of Egegik, Alaska
- 2.0 64 km ESE of Egegik, Alaska
- 2.0 61 km ESE of Egegik, Alaska
- 1.6 24 km S of King Salmon, Alaska
- 2.0 79 km ENE of Ugashik, 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.