Tsunamis
A tsunami consists of a series of unusually large waves formed by a large-scale disturbance of water bodies. One of the primary causes of tsunamis is an earthquake, but tsunamis may also be triggered by landslides, volcanoes or explosions.
Did you know that a majority of the capital region’s coastline is quite elevated? This means that most people are safe from the risk of tsunami, or that anyone in a low-lying coastal areas does not need to travel far to reach safety. Generally, 4 metres or 13 feet elevation above sea level is considered a safe distance from the ocean on Southern Vancouver Island.
The risk of tsunami in the Capital Region: Depends on the earthquake source.
Local Tsunami
A Local Tsunami is the main tsunami threat in the Capital Region and is associated with a “felt” earthquake.
A local tsunami could be generated by a large and strong earthquake, such as a Cascadia Subduction Zone earthquake off the Pacific Coast of Vancouver Island, sometimes referred to as “the big one.”
If you are near the ocean and feel a major earthquake, or if the motion makes it hard to stand, get to higher ground immediately - do not wait for an official warning. The shaking is your warning. Local government officials may not have enough time to issue a warning to residents in the event of tsunami created by a near-shore earthquake.
Stay Alert for natural warning signs of a tsunami such as:
- Ground shaking
- A sudden rise or fall of ocean level
- A loud roaring noise coming from the ocean
Distant Tsunami
A Distant Tsunami may be associated with an earthquake from far away (like Alaska or Japan) and may not be felt. The risk of a distant tsunami is low for a majority of the region.
Typically, there is time for an official warning and safe evacuation if deemed necessary by officials. Monitor local media and follow the instructions of local emergency officials.
How to Prepare
- Know your risk
- Prepare an emergency kit
- Make an emergency plan
To learn more about tsunami risk and/or coastal flooding due to sea level rise and storm surge on our coast. Visit the Capital Region Coastal Flood Inundation Mapping Project completed in 2020 or contact your local emergency program.