Natural hazards · Unalaska

Unalaska, AK natural hazards

Most of the natural-hazard damage FEMA expects in Unalaska comes from earthquakes, and overall the risk is very high for a U.S. community.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations

Expected damage

How exposed is Unalaska?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Unalaska to be higher than in 99% of U.S. communities, mostly from earthquakes and tsunamis.

Earthquakes38%Tsunamis30%Volcanic activity27%Everything else4%

By hazard

What Unalaska faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Earthquakes

38% of expected damage

Well above average · higher than 98% of U.S. places

Tsunamis

30% of expected damage

Well above average · among the top 1% of U.S. places

Volcanic activity

27% of expected damage

Well above average · among the top 1% of U.S. places

Lower here

TornadoesIce stormsWinter weatherLandslidesLightningAvalanches

Not a risk here

Inland floodingCoastal floodingHurricanesHailCold wavesHeat wavesWildfireStrong windDrought

Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.

Flood insurance claims

Does Unalaska flood?

FEMA's records show no paid flood insurance claims in Unalaska.

Disasters that hit Unalaska

Federal disasters declared here

None of the disasters declared for Aleutians West Census Area shows FEMA aid or repair money reaching Unalaska itself in FEMA’s records.

Brought FEMA money into UnalaskaDeclared for Aleutians West Census Area only

Aleutians West Census Area has had 4 natural disasters declared since 1953, most often severe storms and floods.

About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.

Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. Unalaska is smaller than a census tract, so it shares the figures of the tract around its center.

Money that reached townFlood claims are matched to Unalaska’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Unalaska. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau.