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Tsunami Warnings and Preparedness for Seaside, OR USA

There are no active watches, warnings or advisories for North Oregon Coast (Oregon).

Logo: Tsunami Evacuation Sign

What Is A Tsunami?

Tsunami (soo-NAH-mee): a Japanese word that means harbor wave; a sea wave of local or distant origin that results from large-scale seafloor displacements associated with large earthquakes, major submarine slides, or exploding volcanic islands. Typically generated by seismic or volcanic activity or by underwater landslides, a tsunami consists of a series of high-energy waves that radiate outward like pond ripples from the area in which the generating event occurred.

Not all earthquakes produce tsunamis. To generate a tsunami, an earthquake must occur underneath or near the ocean, be very large (approximately Richter magnitude 7 or greater), and create vertical movement of the sea floor. However, recent studies regarding the potential for a great Cascadia Subduction zone earthquake off the Washington, Oregon, and Northern California coastlines indicate the local tsunami waves may reach nearby coastal communities within minutes of the earthquake thereby giving little or no time to issue warnings.

How will I know if a Tsunami is coming?

The WC/ATWC and PTWC may issue the following bulletins:

If you're near a coastal beach, here are ways to know a tsunami may be imminent and you need to seek higher ground:

Tsunami Evacuation Maps

View Seaside Tsunami evacuation maps by clicking below:

Seaside OR, Tsunami Warning Test:

Tsunami Preparedness

Read the publication Tsunami Preparedness in Oregon

Logo: Tsunami Ready

Live on the Coast? Is your community TsunamiRead? Visit the TsunamiReady site!

Tsunami Debris

The earthquake and resulting tsunami that struck Japan in March 2011 swept millions of tons of debris into the Pacific Ocean. While most of the material sank or dispersed, an unknown amount is projected to wash up on shore in the Pacific Northwest. As of June 2012, some items linked to the tsunami have already been found on Oregon beaches. Read more information on Tsunami Debris on the Oregon Coast

Tsunami History

Evidence of past Tsunamis on the Washington Coast:

Tsunami evidence in tidal land on Washington Coast:

Exploring the evidence of past Subduction Zone Earthquake caused Tsunamis on the Pacific Coast. This was a public walking tour on April 14, 2012 at the river bank of the Naiwaikum River led by Brian Atwater a USGS geologist and arranged by the Pacific County Emergency Management Agency (PCEMA). The different color sands on the riverbank are evidence of the sudden land drop and tsunami after a subduction zone earthquake in year 1700. If you dig deeper you can see evidence of other buried soils that indicate older past land level change/tsunami events, the oldest found here was from year 400. This evidence has been corroborated with study of growth rings in local trees.

Geologists have found the stumps of Sitka spruce and red cedar that were poisoned when the land sank and seawater invaded ground that was formerly above the high tide level. Study of growth rings in the killed trees show that they grew their final layer of wood during the year 1700 quake. Videos by Mike Challis

Tsunami Related links ...
Pacific County Emergency Management
Pacific County Emergency Management - Press Release Blog
Washington State Emergency Management Division
National Weather Service NOAA Weather Radio
National Weather Service NOAA All-Hazards Emergency Messages
Special Needs NOAA Weather Radio for Deaf and Hard-of-Hearing Individuals
Emergency Alert System (NOAA)
Emergency Alerting System (Washington State Emergency Management)
FEMA for Kids - NOAA Weather Radio
Washington Association of Broadcasters - Emergency Alert System
American Red Cross (Capital Area Chapter) -NOAA Weather Radio