Earthquakes
The Oregon coast is vulnerable to great earthquakes that can occur on the offshore Cascadia Subduction Zone (CSZ), which runs from British Columbia to northern California.
The Cascadia subduction zone is the convergent boundary between the large North America plate and the small Juan de Fuca and Gorda plates to the west.
These smaller plates plunge beneath the North America plate at a rate of 1 to 11/2 inches per year. As the Juan de Fuca and Gorda plates push into North America, stress accumulates. Earthquakes are caused by the abrupt release of this slowly accumulated stress.
CSZ earthquakes are believed to occur every 200 to 600 years, and the last major event in the CSZ is estimated to have occurred 300 years ago.
In the event of an earthquake, move to high ground until told to return to lower lying areas that are susceptible to tsunamis.
Disaster Supplies
You may need to survive on your own after an emergency. This means having your own food, water, and other supplies in sufficient quantity to last for at least three days. Local officials and relief workers will be on the scene after a disaster, but they cannot reach everyone immediately. You could get help in hours, or it might take days. In addition, basic services such as electricity, gas, water, sewage treatment and telephones may be cut off for days, or even a week or longer.
Go to this link to read the items you should have set aside in case of an emergency.
Click here for A Small Disaster Survival Guide
Tsunami
Earthquakes can cause tsunamis – large water waves generated by seismic deformation of the sea floor.
Subduction earthquakes, such as those that occur off the Oregon coast, tend to generate tsunamis. As a tsunami nears the shore, it both slows in speed and grows in height so that a tsunami unnoticed at sea may grow to be several meters or more in height as it reaches land.
Port Orford’s Tsunami Alert is an earthquake, or a Curry County Everbridge alert on your phone. Do NOT wait for a siren or evacuation order from law enforcement. As soon as the ground stops shaking, immediately move to the nearest high ground with 85+ feet elevation, higher is better. See the tsunami evacuation map and practice your routes from home, work, and school. Expect to travel on foot as roads will be damaged and trees downed after a quake. Walk, jog, or run – move as fast as you possibly can, with an Emergency Go Bag if possible. You will not have time to pack – a tsunami could arrive within 10-15 minutes once the shaking stops. Be prepared to remain on high ground until the danger has passed, which may take hours or days.
To sign up for emergency alerts on Curry County’s Everbridge Emergency alert system go to this link and fill out the form on your computer, not your phone:
https://member.everbridge.net/892807736723773/new
Tsunami Evacuation Maps for Oregon Coastal Cities:
Port Orford Evacuation Map
Nesika Evacuation Map
Gold Beach Evacuation Map
Brookings Evacuation Map
Natural Hazards Mitigation Plan
Click here to view the current Curry County Natural Hazards Plan.
Click here to download the Port Orford portion of the Curry County Natural Hazards Plan.