Earthquake · automatic estimate, may change
M 1.8ml
29 km SSE of Chickaloon, Alaska
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 22 km below the surface
- Felt
- no reports yet
- Nearest
- Anchorage Municipality, 64 km SW
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 1745 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 710,000× the energy of this one
- Around the size people start to feel M 3.0 63× the energy of this one
- This earthquake M 1.8 about 15 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 61.5352, -148.3510. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Anchorage Municipality, AK | 64 km (40 mi) | NE of here | earthquakes near Anchorage Municipality |
| Matanuska-Susitna Borough, AK | 101 km (63 mi) | SE of here | earthquakes near Matanuska-Susitna Borough |
| Chugach Census Area, AK | 164 km (102 mi) | NW of here | earthquakes near Chugach Census Area |
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.
- 1.9 19 km ENE of Knik River, Alaska
- 1.6 16 km ESE of Chickaloon, Alaska
- 1.9 12 km E of Lazy Mountain, Alaska
- 1.8 10 km N of Chickaloon, Alaska
- 1.6 25 km SSE of Chickaloon, Alaska
- 1.7 54 km ESE of Knik River, Alaska
- 1.7 9 km WSW of Glacier View, Alaska
- 1.5 32 km SE of Chickaloon, Alaska
- 1.9 15 km ESE of Chickaloon, Alaska
- 1.7 33 km SE of Knik River, Alaska
- 2.2 34 km SSE of Knik River, Alaska
- 1.8 26 km SSE of Chickaloon, Alaska
- 1.5 40 km NNE of Whittier, Alaska
- 1.9 37 km SSW of Glacier View, Alaska
- 2.1 5 km ESE of Chickaloon, 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 4.6 on 2018-01-27 — it released about 16,000 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.