Photo: Mate Romano

Can you swim a tsunami?

What is a tsunami? Tsunamis are a series of very dangerous, large, long ocean waves caused by earthquakes or volcanic eruptions under the sea. You cannot swim or surf tsunamis because they flood the land like a rushing river (or fast-rising tide) rather than curling and breaking like a regular surfing wave.

honolulu.gov - Tsunami - Honolulu.Gov

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What is a tsunami?

Tsunamis are a series of very dangerous, large, long ocean waves caused by earthquakes or volcanic eruptions under the sea. You cannot swim or surf tsunamis because they flood the land like a rushing river (or fast-rising tide) rather than curling and breaking like a regular surfing wave. A tsunami picks up and carries debris, which greatly increases the chance of injury, property destruction, and death. Since 1946, more than 220 people have died in the State of Hawaii, including six on Oahu, due to tsunamis. Knowing if you’re in an evacuation zone, recognizing the natural warning signs, and understanding how you will be alerted can make the difference between life and death.

View our multilingual tsunami resources.

Tsunami alerts are issued in Hawai’i by the Pacific Tsunami Warning Center (PTWC). There are four levels of tsunami alerts: warning, advisory, watch, and information statement. Each alert is tied to a specific action for you to take. When an alert is issued, stay tuned to local radio/TV stations and official social media for more detailed or specific information. Review the DEM Understanding Tsunami Alerts and know what each alert means to you and your family and what actions to take. You can also click on the image for a downloadable PDF version. When there is a Tsunami Warning, the public will be advised which evacuation zone to leave. Don't wait to evacuate. It can take time to clear an evacuation zone, so leave as quickly and safely as possible. Know if you are in a Tsunami Evacuation Zone (TEZ) or an Extreme Tsunami Evacuation Zone (XTEZ) using the Oahu Tsunami Evacuation Map. If the map is slow or not responding, you can use the National Oceanic and Atmospheric Administration's version of the map. The Oahu Tsunami Evacuation Map illustrates two Tsunami Evacuation Zones: Tsunami Evacuation Zone (TEZ): TEZ is used for most tsunami warnings. These areas are shown in RED on the map. For this evacuation you are considered safe when you have reached the YELLOW or GREEN Zones. This zone is based on the historical tsunami impacts on the State of Hawaii and Island of Oahu over the past 100 years. Extre me Tsunami Evacuation Zone (XTEZ): If an earthquake happens in the Eastern Aleutian Islands with a magnitude 9.0 or greater, it would cause a rare, more extreme tsunami event that would result in much more extensive flooding throughout Oahu. In this rare case, officials may advise evacuating further inland beyond XTEZ. These areas are shown in YELLOW on the map. For this evacuation you are considered safe when you have reached the GREEN Zone. You can also view and print via your broser these maps posted by the Pacific Disaster Center (PDC) here

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What burns fire underwater?

The combustible gas, which might be hydrogen or acetylene, depending on the application, can be combined with oxygen gas (the oxidizer) to produce an underwater flame at the tip of the torch.

ccmr.cornell.edu - How do underwater flares and torches work, when water puts out fires?

How do underwater flares and torches work, when water puts out fires?

Thank you for your question about underwater cutting torches. The first thing you must realize is that a flame requires a combustible substance and an oxidizer. In the case of a candle flame, the combustible substance is the heated wax which rises up the candle wick and is vaporized by the heat of the flame. The oxidizer is the oxygen in the surrounding atmosphere. These two ingredients can sustain a candle flame. In the case of an underwater torch, both the combustible substance and the oxidizer must be supplied by hoses leading down to the torch, since no free oxygen is available underwater. The combustible gas, which might be hydrogen or acetylene, depending on the application, can be combined with oxygen gas (the oxidizer) to produce an underwater flame at the tip of the torch. In order to maintain a steady flame, it is necessary to have a stable bubble around the flame which the exhaust gases from the combustion (typically water vapor and carbon dioxide) cannot maintain by themselves. The gas must be supplied at a high enough pressure to overcome the pressure exerted by the water. An underwater torch must therefore have a separate means for sustaining a bubble around the work location. This is accomplished by separate jets of compressed air introduced around the tip of the torch to protect the flame from the surrounding water by forming a rather large bubble enclosing the flame and the region directly adjacent to the work location. As you might imagine, a great deal of skill is required for divers who perform this kind of work.

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