M5.5 Earthquake: 92 km NNW of Aleneva, Alaska

Updated 09:05 UTC · 29 Oct 2026

A magnitude 5.5 earthquake struck 92 km NNW of Aleneva, Alaska at 18:34 UTC on 6 Oct 2026, at a depth of 88 km, reported by USGS. USGS PAGER issued a green alert: little or no damage and a low chance of deaths. USGS did not set a tsunami flag for this quake. So far 1 aftershock of M2.5+ has been recorded within 50 km, the largest a M2.6.

M5.5

Magnitude (USGS)

88 km

Depth

intermediate

GREEN

USGS PAGER impact alert

estimated impact

Aftershocks M2.5+ so far

within 50 km

[ fig. 1 ] M5.5 EPICENTRE, AFTERSHOCKS AND PAST QUAKESThis quakeAftershock M5+AftershockPast M6+

USGS · updated 09:05 UTC 2026-10-29Tap a point for details · pinch or ctrl + scroll to zoomTrack this live in the app ›

Nearest places

Aleneva, Alaska, United States92 km from the epicentre · quake was NNW of here · population 3792 KM
Anchorage, Alaska, United States340 km from the epicentre · quake was SW of here · population 291,247340 KM
Eagle River, Alaska, United States360 km from the epicentre · quake was SW of here · population 24,793360 KM
Knik-Fairview, Alaska, United States375 km from the epicentre · quake was SW of here · population 14,923375 KM
Whitehorse, Yukon, Canada1,061 km from the epicentre · quake was WSW of here · population 28,2011,061 KM

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Strongest aftershocks so far

M2.6 · 87 km N of Aleneva, Alaska2026-10-15 12:18 UTC · 61 km deep · USGSLOW

Key context

Tectonic setting

Aleutian-Alaska megathrust. The Pacific Plate subducts north beneath the North American Plate along the Aleutian Trench. This megathrust produced the M9.2 Great Alaska Earthquake of 1964, the largest recorded in North America, and the M8.2 Chignik quake of 2021.

The USGS moment tensor shows strike-slip faulting: the two sides of the fault slid sideways past each other.

At 88 km it was an intermediate-depth quake. These are felt over a wide area, but the shaking at the surface is usually weaker than from a shallow quake of the same size, and they rarely cause tsunamis.

Shaking and impact

USGS PAGER estimates the impact from the shaking and the number of people exposed. For this quake it issued a green alert: little or no damage and a low chance of deaths (fatality alert: green, economic loss alert: green). PAGER is an early estimate and can change as reports come in.

The USGS ShakeMap estimates the strongest shaking at intensity IV on the Modified Mercalli scale (light).

342 people sent a "Did You Feel It?" report to USGS, with the strongest reported intensity V (moderate).

Estimated shaking in nearby towns, from USGS PAGER.
Town	Population	Estimated intensity
Kokhanok	109	IV (light)
Aleneva	0	III (weak)
Pope-Vannoy Landing	0	III (weak)

Aftershocks

This page counts quakes of M2.5 or more within 50 km after the main shock, from the USGS catalog (last checked 09:05 UTC, 29 Oct 2026): 1 aftershock so far.

Aftershocks are normal after a quake of this size. They usually become less frequent over days and weeks, but a strong aftershock can still happen, and in a few sequences a later quake is larger. No one can predict their exact time or size; follow the official agency for your area.

Earthquake history within 250 km

Since 1976, USGS lists 122 quakes of M5 or more within 250 km of this epicentre, about 2.4 a year. Since 1900 the same circle had 140 quakes of M5.5 or larger.

Largest earlier quakes within 250 km, USGS catalog since 1900 (M6+).
Magnitude	Place (USGS)	Date	Depth
M7.9	Kodiak Island region, Alaska	1900-10-09	20 km
M7.1	47 km ESE of Pedro Bay, Alaska	2016-01-24	126 km
M7.1	4 km ENE of Karluk, Alaska	1912-11-07	35 km
M7.0	153 km SE of Halibut Cove, Alaska	1906-12-23	15 km
M7.0	26 km SSE of Karluk, Alaska	1999-12-06	44 km
M7.0	Event 36 Novarupta-Mount Katmai area, Alaska Peninsula	1912-06-08	0 km
M6.9	47 km S of Old Harbor, Alaska	2001-01-10	36 km
M6.8	Event 37 Novarupta-Mount Katmai area, Alaska Peninsula	1912-06-08	0 km

Official information

Alaska Earthquake Center
National Tsunami Warning Center
EMSC (European-Mediterranean Seismological Centre)
USGS event page for this quake (ShakeMap, PAGER, felt reports)
tsunami.gov for US tsunami bulletins

Data status

USGS review status: reviewed. Magnitude type: ml. USGS last updated this event on 28 Oct 2026 at 18:44 UTC. Magnitude, depth and location can still be revised; this page keeps the same address if they change.

Questions and answers

How strong was the earthquake near Aleneva, Alaska?

USGS measured it at magnitude 5.5 (ml), 88 km deep. The strongest estimated shaking was intensity IV (light). Quakes of M5 to 5.9 are classed as moderate.

Was there a tsunami?

USGS did not set a tsunami flag for this quake. If you are on a coast and feel strong or long shaking, move to high ground anyway, and follow local officials.

Was the earthquake felt?

Yes. 342 people reported it to USGS "Did You Feel It?", with reports up to intensity V.

Will there be more aftershocks?

Aftershocks are likely to continue for days to weeks, becoming less frequent over time. So far 1 aftershock of M2.5+ has been listed. Most sequences do not produce a larger quake, but some do. No one can predict the time or size of the next one; follow Alaska Earthquake Center.

What should I do after a strong earthquake?

Expect aftershocks: Drop, Cover and Hold On when shaking starts again. Check for injuries and damage, stay out of damaged buildings, and use text messages instead of calls so emergency lines stay free. On a coast, move to high ground after strong shaking. Follow your local officials.

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Sources

USGS event page: magnitude, location, ShakeMap, PAGER and Did You Feel It? data for this event. Public domain. Credit: U.S. Geological Survey.
USGS ComCat (FDSN event web service): the USGS earthquake catalog, used for the 30-year counts, history and aftershocks. Public domain. Credit: U.S. Geological Survey.
USGS Geoserve: nearest places to the epicentre.
GeoNames: large-city coordinates, CC BY 4.0.

Page built 09:05 UTC, 2026-10-29. Full list: data sources and method.