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Tsunami Maps Provided By:
Oregon Department of Geology and Mineral Industries (DOGAMI) |
Important Map Notes
These maps show predictions for the estimated maximum extent of inundation for a LOCAL Cascadia tsunami (YELLOW) for all of Oregon and Washington overlaid on Google Maps. For portions of the Oregon coast only (e.g. currently Bandon to OR/CA border and Cannon Beach), these maps show TWO inundation lines: the estimated maximum extent of inundation for a LOCAL Cascadia tsunami (YELLOW) and a DISTANT tsunami (ORANGE). The entire Pacific coast including Puget Sound, are vulnerable to DISTANT tsunamis even if not depicted on this map. Sections of the coast marked by diagonal lines are currently unmapped, but are also vulnerable to tsunamis - Be vigilant and know what to do when at the coast.
Printable tsunami evacuation maps
Oregon coastal communities:
www.oregongeology.org/tsuclearinghouse/pubs-evacbro.htm
The technical lead agencies responsible for the development of these map products include the Oregon Department of Geology and Mineral Industries and Oregon Emergency Management.
Washington coastal communities:
www.dnr.wa.gov/programs-and-services/geology/geologic-hazards/Tsunamis#tsunami-hazard-maps
The technical lead agencies responsible for the development of these map products include the Washington Department of Natural Resources and Washington Emergency Management.
Signs a Tsunami is coming
Natural Warning
Strong ground shaking, a loud roar from the ocean, the water receding from the shore unusually far and exposing the sea floor, or the water level rising rapidly are all nature’s warning signs that a tsunami may be coming. If you observe any of these signs, immediately move to higher ground or inland. A tsunami may arrive within minutes.
DO NOT WAIT for an official warning. The earthquake or changes in the water at the shore may be your only warning, and you may have only minutes to get to high ground. Stay away from low areas until told by officials that the danger has passed. Waves may impact the coast at irregular intervals for ten hours or longer.
Official Warning
For DISTANT tsunamis you may learn that a tsunami alert has been issued by the West Coast and Alaska Tsunami Warning Center through TV and radio station broadcasts, NOAA Weather Radio, or in some cases by announcements from emergency officials, aircraft, outdoor sirens, or mobile devices. Immediately, move away from beaches, harbors, or low-lying areas and follow instructions from emergency personnel. For LOCAL tsunamis there will not be time for an official warning; the earthquake is your warning. Both natural warnings and official alerts are equally important. Respond to whatever you hear or observe first!
OREGON mapping
The Oregon Department of Geology and Mineral Industries (DOGAMI) and Oregon Emergency Management (OEM), in partnership with the National Tsunami Hazard Mitigation Program (NTHMP), completed mapping tsunami evacuation zones for the entire Oregon coast in 2013. The evacuation maps show two tsunami hazard zones: inundation associated with a maximum considered DISTANT (ORANGE) tsunami and LOCAL (YELLOW) Cascadia tsunami.
WASHINGTON mapping
The Washington Department of Natural Resources (WA DNR) and Washington Emergency Management Division (WA EMD), in partnership with NTHMP, completed 1st generation evacuation maps of selected portions of the Washington coast between 1998 and 2010 based on the maximum considered inundation expected for a LOCAL Cascadia tsunami. WA DNR and WA EMD are presently working to update evacuation zones to reflect new earthquake source information developed by Oregon Department of Geology and Mineral Industries, which will be used to develop a new suite of evacuation maps for the Washington coast. Maps developed for the Washington coast will continue to include only one evacuation zone for all tsunami events.
Tsunami Bulletins are issued when events might affect the west coast.
Current Tsunami Bulletins For The West Coast
Know The Natural Warning Signs Of Tsunami
Strong local earthquakes may cause tsunamis. If the shaking causes you to fall or to have difficulty standing, this is your first natural tsunami warning sign. First, protect yourself from the earthquake effects. When the shaking stops, immediately leave the evacuation zone. |
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Receding water. As a tsunami approaches the shoreline, it could possibly expose the ocean floor, reef, and fish. |
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Seeing or hearing the water. You might see an approaching wall of water and/or hear a loud roaring sound similar to that of a train or jet aircraft. |
Tsunami Message Definitions
Tsunami Warning: A potentially destructive tsunami is imminent or expected. Warnings alert the public that widespread, dangerous coastal flooding is possible and may continue for several hours after the initial wave arrives. Appropriate response to the tsunami threat may include evacuating beaches and low-lying coastal areas and repositioning ships to deep water when there is time to safely do so.
Tsunami Watch: Alerts emergency officials and the public that a potentially destructive tsunami may later impact the Watch area. Therefore, appropriate actions should be taken to monitor the event and prepare to evacuate if the Watch is upgraded to a Tsunami Warning.
Tsunami Advisory: Advises public of potential threat of tsunami that may produce strong currents or waves dangerous to those in or near the water. Significant widespread inundation is not expected.
Information Statement: Informs emergency officials and public that an earthquake has occurred. There is little or no threat of a destructive tsunami.
To learn more about the tsunami warning system visit the NOAA Tsunami Website
Emergency Information
The Oregon State Emergency Alert System (EAS) is used to notify the public of a possible approaching tsunami. A steady three minute siren tone is the attention alert signal. Turn on the nearest radio or television and listen for emergency information and instructions. In some cases not all radio or television stations may be able to transmit. As part of the EAS, particular radio stations have been designated as primary sources for information. Click the link below to find out more about these stations. |
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The State and County Civil Defense Agencies test the EAS at 11:15 a.m. on the first workday of the month. When you hear the test sirens or your radio or television program is interrupted this is your opportunity to think about what you will do when it is not a test. |
You cannot prevent a tsunami but you can be prepared for one. Actions you take now could save your life and the lives of your friends and family in an emergency. Plan now, not when the ground is shaking.
Develop An Emergency Plan
Developing a family emergency plan will provide your family with information that could save lives and protect property. |
Assemble An Emergency Preparedness Kit
Emergency preparedness kits should contain the essentials your family needs to survive during a disaster. It may take 72 hours or more for emergency personnel to reach you. Don't wait: hundreds of other families in your area share the same concerns, and it will be difficult to get access to the necessities you need due to shortages and competition. |
Plan For Evacuation
If you live or work in a tsunami evacuation zone, identify an evacuation route from your home or workplace. Identify a safe area outside the evacuation zone where you and others can safely congregate. After an earthquake, roads may become impassable or blocked so be prepared to evacuate by foot if necessary. Once you know your route develop the plan to evacuate. Consider securing your property, collecting pets, turning off the electricity and water, and bringing essential documents and emergency supplies. Practice this evacuation plan with others so when there is a tsunami all are prepared to act. The video below (in Spanish with English subtitles) from Cascadia CoPes Hub demonstrates how to use an evacuation map to be prepared for a tsunami in community. |
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