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

History, not a forecast

These counts do not measure current danger, probability, severity, loss, or personal exposure. A higher rank means only that a county has more records within the same official source and exact coverage window. FEMA and NOAA counts are never added together.

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 – Mar 19, 2024

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.