Earthquake · reviewed by a seismologist
M 1.7ml
99 km E of McCarthy, Alaska
Yes. A magnitude 1.7 earthquake was recorded 99 km E of McCarthy, Alaska at 11:50 UTC on 2026-10-26, 5.8 km deep.
- When
- Magnitude
- M 1.7 (ml)
- Depth
- 5.8 km below the surface
- Felt
- no reports yet
- Nearest mapped fault
- Totschunda fault, 19 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 18 days ago
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 11 km (7 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 89× the energy of this one
- This earthquake M 1.7 about 11 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 4.9 on 2021-05-09 — about 63,000 times the energy of this one.
Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:
- 6.1 109 km E of McCarthy, Alaska · 15 km SE of this epicentre
- 5.5 87 km ENE of McCarthy, Alaska · 30 km NNW of this epicentre
- 5.4 140 km SSE of Alcan Border, Alaska · 44 km ENE of this epicentre
- 5.3 136 km E of McCarthy, Alaska · 38 km ENE of this epicentre
- 5.1 145 km ESE of McCarthy, Alaska · 48 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 61.3720, -141.0660. Map © OpenStreetMap contributors.
Aftershocks so far
10 earthquakes have been recorded within 50 km since this one.
- 1.8 120 km E of McCarthy, Alaska
- 2.1 108 km ESE of McCarthy, Alaska
- 1.6 86 km ESE of McCarthy, Alaska
- 2.7 124 km E of McCarthy, Alaska
- 1.3 82 km ENE of McCarthy, Alaska
- 1.6 95 km E of McCarthy, Alaska
- 1.5 123 km E of McCarthy, Alaska
- 1.4 106 km E of McCarthy, Alaska
- 1.6 103 km E of McCarthy, Alaska
- 2.8 88 km ENE of McCarthy, 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| review status | automatic | reviewed | |
| location | 98 km E of McCarthy, Alaska | 99 km E of McCarthy, Alaska | |
| longitude | -141.09 | -141.07 | |
| latitude | 61.38 | 61.37 | |
| depth | 5 | 5.8 | |
| longitude | -141.08 | -141.09 | |
| latitude | 61.38 | 61.38 | |
| magnitude | 1.6 | 1.7 |
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.