Earthquake · reviewed by a seismologist
M 3.9ml
14 km NW of Nikiski, Alaska
- When
- Magnitude
- M 3.9 (ml)
- Depth
- 69 km below the surface
- Felt
- 62 reports · strongest reported intensity III
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Kenai Peninsula Borough, 67 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2192 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 62 people have reported feeling it to USGS.
How big was it?
This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 16,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 710× the energy of this one
- Magna, Utah 2020 M 5.7 500× the energy of this one
- This earthquake M 3.9 about 11 tons of TNT
- Around the size people start to feel M 3.0 this one released 22× 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 60.7896, -151.4480. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Kenai Peninsula Borough, AK | 67 km (42 mi) | NE of here | earthquakes near Kenai Peninsula Borough |
| Anchorage Municipality, AK | 124 km (77 mi) | WSW of here | earthquakes near Anchorage Municipality |
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.
- 3.1 19 km SW of Tyonek, Alaska
- 1.8 3 km ESE of Tyonek, Alaska
- 1.8 26 km WSW of Tyonek, Alaska
- 1.6 6 km ENE of Tyonek, Alaska
- 1.7 33 km WNW of Nikiski, Alaska
- 1.6 34 km W of Salamatof, Alaska
- 1.7 26 km WNW of Nikiski, Alaska
- 2.0 30 km WSW of Tyonek, Alaska
- 2.6 2 km SW of Tyonek, Alaska
- 1.7 24 km WNW of Nikiski, Alaska
- 2.1 20 km WNW of Cohoe, Alaska
- 1.9 17 km NNE of Nikiski, Alaska
- 1.6 21 km S of Tyonek, Alaska
- 2.0 21 km W of Tyonek, Alaska
- 2.1 24 km WNW of Cohoe, 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 5.2 on 2017-05-30 — it released about 89 times the energy of this one.
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.