Earthquake · reviewed by a seismologist
M 1.8ml
21 km S of Fishhook, AK
Yes. A magnitude 1.8 earthquake was recorded 21 km S of Fishhook, AK, 87 km (54 mi) NNE of Anchorage, AK, at 6:32 pm AKST on 1 November 2020 (03:32 UTC), 9.6 km deep.
87 km (54 mi) NNE of Anchorage, AK
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 9.6 km below the surface
- Felt
- no reports yet
- Nearest
- Matanuska-Susitna Borough, 40 km NNW
- Nearest mapped fault
- Castle Mountain fault, 22 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2185 days ago
Earthquake alerts for Fishhook, AK
Get a notification in this browser when USGS records an earthquake near Fishhook, AK. No account or email needed.
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 10 km (6 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.
Earthquakes near other towns within 30 km: Fishhook, Sutton-Alpine.
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.
For this area
The largest earthquake within 50 km in our catalogue was M 4.3 on 2017-08-21 — about 5,600 times the energy of this one.
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 61.9281, -149.2266. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Matanuska-Susitna Borough, AK | 40 km (25 mi) | NNW | earthquakes near Matanuska-Susitna Borough |
| Anchorage Municipality, AK | 84 km (52 mi) | S | earthquakes near Anchorage Municipality |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 1.6 14 km SSE of Susitna North, Alaska
- 1.5 30 km ENE of Susitna North, Alaska
- 2.0 24 km SE of Susitna North, Alaska
- 1.6 16 km NNW of Sutton-Alpine, Alaska
- 1.6 7 km SW of Fishhook, Alaska
- 1.5 24 km NE of Willow, Alaska
- 1.8 21 km E of Susitna North, Alaska
- 1.9 42 km ENE of Susitna North, Alaska
- 2.4 14 km NNE of Houston, Alaska
- 2.2 4 km NNW of Lakes, Alaska
- 2.6 26 km NE of Susitna North, Alaska
- 1.8 33 km NNW of Sutton-Alpine, Alaska
- 2.1 19 km N of Fishhook, Alaska
- 2.5 28 km NNW of Fishhook, Alaska
- 2.2 45 km ENE of Susitna North, 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.