Earthquake · reviewed by a seismologist
M 1.6ml
42 km SSW of Cantwell, Alaska
Yes. A magnitude 1.6 earthquake was recorded 42 km SSW of Cantwell, Alaska, at 3:52 pm AKDT on 1 June 2018 (23:52 UTC), 8.2 km deep.
- When
- Magnitude
- M 1.6 (ml)
- Depth
- 8.2 km below the surface
- Felt
- no reports yet
- Nearest
- Denali Borough, 81 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1187 days ago
Earthquake alerts for Healy, 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 8 km (5 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 since 2016 was M 4.6 on 2016-04-26 — about 32,000 times the energy of this one.
Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:
- 5.6 44 km S of Cantwell, AK · 15 km ESE of this epicentre
- 5.5 52 km WSW of Cantwell, Alaska · 33 km WNW of this epicentre
- 5.4 38 km SSE of Cantwell, Alaska · 37 km E of this epicentre
- 5.4 54 km NE of Chase, Alaska · 23 km SSW of this epicentre
- 5.3 49 km S of Cantwell, Alaska · 26 km ESE 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 63.0375, -149.2849. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Denali Borough, AK | 81 km (50 mi) | NNW | earthquakes near Denali Borough |
| Matanuska-Susitna Borough, AK | 87 km (54 mi) | S | earthquakes near Matanuska-Susitna Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.8 54 km NNE of Chase, Alaska
- 1.5 68 km ENE of Chase, Alaska
- 2.4 54 km S of Cantwell, Alaska
- 1.5 35 km NNE of Chase, Alaska
- 1.5 21 km W of Cantwell, Alaska
- 1.9 72 km ENE of Chase, Alaska
- 2.3 43 km SSW of Cantwell, Alaska
- 3.7 34 km W of Cantwell, Alaska
- 1.5 41 km ENE of Chase, Alaska
- 1.5 61 km ENE of Chase, Alaska
- 1.7 47 km S of Cantwell, Alaska
- 2.2 48 km ENE of Chase, Alaska
- 1.9 36 km WSW of Cantwell, Alaska
- 1.7 17 km W of Cantwell, Alaska
- 1.5 Central 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.