Earthquake · automatic estimate, may change
M 1.8ml
72 km W of Karluk, Alaska
Yes. A magnitude 1.8 earthquake was recorded 72 km W of Karluk, Alaska at 03:36 UTC on 2026-10-11, 12 km deep. The magnitude and location are an automatic first estimate and may change.
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Lake and Peninsula Borough, 77 km NW
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 33 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 7 km (4 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 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 since 2016 was M 5.3 on 2018-05-11 — about 180,000 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 5.5 64 km SW of Karluk, Alaska · 44 km SSE of this epicentre
- 5.4 60 km E of Ugashik, Alaska · 45 km WSW of this epicentre
- 5.2 55 km WSW of Karluk, Alaska · 25 km SE of this epicentre
- 5.0 54 km WNW of Karluk, Alaska · 28 km NE 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 57.5450, -155.6600. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake and Peninsula Borough, AK | 77 km (48 mi) | NW | earthquakes near Lake and Peninsula Borough |
| Kodiak Island Borough, AK | 105 km (65 mi) | E | earthquakes near Kodiak Island Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 1.4 64 km WNW of Karluk, Alaska
- 1.5 88 km E of Ugashik, Alaska
- 2.1 72 km WSW of Karluk, Alaska
- 1.4 85 km WNW of Karluk, Alaska
- 2.1 51 km WSW of Karluk, Alaska
- 1.5 71 km WSW of Karluk, Alaska
- 1.5 86 km W of Karluk, Alaska
- 2.0 62 km WSW of Karluk, Alaska
- 2.4 72 km WNW of Karluk, Alaska
- 2.2 46 km WSW of Karluk, Alaska
- 2.1 75 km SW of Karluk, Alaska
- 1.7 84 km ESE of Egegik, Alaska
- 1.6 74 km ESE of Ugashik, Alaska
- 1.4 76 km WNW of Karluk, Alaska
- 1.6 60 km NW of Karluk, 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 |
|---|---|---|---|
| magnitude | 1.9 | 1.8 |
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.