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Could a tsunami hit Hawaii?

Historically, locations in Hawaii have been flooded with water more than 30 feet deep. Tsunami events have no season like hurricanes. A tsunami can occur at any time of the day or night, at any time of the year.

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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Can humans stop an earthquake?

We cannot prevent natural earthquakes from occurring but we can significantly mitigate their effects by identifying hazards, building safer structures, and providing education on earthquake safety. By preparing for natural earthquakes we can also reduce the risk from human induced earthquakes.

usgs.gov - Can we cause earthquakes? Is there any way to prevent earthquakes?

Earthquakes induced by human activity have been documented at many locations in the United States and in many other countries around the world. Earthquakes can be induced by a wide range of causes including impoundment of reservoirs, surface and underground mining, withdrawal of fluids and gas from the subsurface, and injection of fluids into underground formations. While most induced earthquakes are small and present little hazard, larger and potentially damaging manmade earthquakes have occurred in the past. The hazard posed by manmade earthquakes can be mitigated by minimizing or in some cases stopping the activity that is causing the earthquakes to occur. For example, earthquakes linked to wastewater disposal in deep wells in Colorado, Ohio and Arkansas stopped occurring after injection was halted. We cannot prevent natural earthquakes from occurring but we can significantly mitigate their effects by identifying hazards, building safer structures, and providing education on earthquake safety. By preparing for natural earthquakes we can also reduce the risk from human induced earthquakes.

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