Disaster-history hazard lens

Tsunami or seiche history by county

Tsunamis and seiches. Compare official county histories below while keeping FEMA administrative declarations separate from NOAA observed-event reports.

Data updated Aug 21, 2026 · Current conditions: Live Dashboard →

Administrative records

FEMA declaration history

Federal administrative declarations that include a county designation and map to this hazard category. A declaration is a government action, not a physical-event census.

1 county has a positive tsunami or seiche count in this source.

Coverage: Jan 1, 1964 – Aug 21, 2026

Rankings compare only this source and exact coverage window. Equal counts share a rank.

Tsunami or seiche fema declaration history by county
Rank	County	Unique declarations
1	Honolulu County, Hawaii	1

Observed-event reports

NOAA observed-event history

Distinct NOAA Storm Events records explicitly coded to a county and mapped to this hazard category. Forecast-zone and marine-zone records are excluded from county totals.

1 county has a positive tsunami or seiche count in this source.

Coverage: Jan 1, 1996 – May 31, 2026

Rankings compare only this source and exact coverage window. Equal counts share a rank.

Tsunami or seiche noaa observed-event history by county
Rank	County	County-event records
1	Anchorage Municipality, Alaska	1

How to interpret this hazard lens

Hazard categories normalize source labels into a shared taxonomy; source definitions and reporting practices still differ.
FEMA declarations reflect federal administrative actions and do not inventory every damaging local event.
NOAA totals include only distinct county-coded Storm Events records; forecast-zone and marine-zone records are excluded.
Only counties with a positive count for this category appear in each source table. Open a county profile for its complete source disclosures and preparedness context.