Earthquake · automatic estimate, may change
M 2.1ml
36 km SW of Tonsina, Alaska
- When
- Magnitude
- M 2.1 (ml)
- Depth
- 7.2 km below the surface
- Felt
- no reports yet
- Nearest
- Chugach Census Area, 107 km SSW
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 2516 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
- Magna, Utah 2020 M 5.7 250,000× the energy of this one
- Around the size people start to feel M 3.0 22× the energy of this one
- This earthquake M 2.1 about 43 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.
Where
Epicentre 61.4110, -145.6297. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Chugach Census Area, AK | 107 km (67 mi) | NNE of here | earthquakes near Chugach Census Area |
| Copper River Census Area, AK | 114 km (71 mi) | SW of here | earthquakes near Copper River Census Area |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.7 38 km NNE of Valdez, Alaska
- 1.5 33 km NNE of Valdez, Alaska
- 1.6 42 km ENE of Valdez, Alaska
- 4.8 Southern Alaska
- 1.9 30 km ESE of Valdez, Alaska
- 1.6 47 km W of Tonsina, Alaska
- 1.6 Southern Alaska
- 2.3 53 km N of Valdez, Alaska
- 1.8 47 km W of Tonsina, Alaska
- 1.5 48 km W of Tonsina, Alaska
- 1.7 23 km NNE of Valdez, Alaska
- 1.7 50 km N of Valdez, Alaska
- 1.6 35 km NE of Valdez, Alaska
- 1.6 39 km WSW of Tonsina, Alaska
- 1.8 36 km E of Valdez, 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 4.0 on 2017-03-03 — it released about 710 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.