How do you know when a tsunami is going to happen?
Witnesses have reported that an approaching tsunami is sometimes preceded by a noticeable fall or rise in the water level. If you see the ocean receding unusually rapidly or far it's a good sign that a big wave is on its way. Go to high ground immediately.
Deep-ocean tsunami detection buoys are one of two types of instrument used by the Bureau of Meteorology (Bureau) to confirm the existence of tsunami waves generated by undersea earthquakes. These buoys observe and record changes in sea level out in the deep ocean.
- To help identify and predict the size of a tsunami, scientists look at the size and type of the underwater earthquake that precedes it. This is often the first information they receive, because seismic waves travel faster than tsunamis. And not all earthquakes create tsunamis, so false alarms can and do happen.
- The first thing you should try to do, if possible, is to move away from the coast, lagoons or other bodies of water, towards higher ground and even into hills or mountains. Move until you are either 2 miles (3,200 m) inland or 100 feet (30 m) above sea level. Expect roads to be totally wiped out by a tsunami.
- An earthquake followed by a landslide in 1958 in Alaska's Lituya Bay generated a wave 100 feet high, the tallest tsunami ever documented. When the wave ran ashore, it snapped trees 1,700 feet upslope.
2. As a tsunami approaches shorelines, water may recede from the coast, exposing the ocean floor, reefs and fish. 3. Abnormal ocean activity, a wall of water, and an approaching tsunami create a loud "roaring" sound similar to that of a train or jet aircraft.
- Most tsunamis, about 80 percent, happen within the Pacific Ocean's Ring of Fire, a geologically active area where tectonic shifts make volcanoes and earthquakes common. In 2004 more than 200,000 people—the most ever recorded—died in an Indian Ocean tsunami that was triggered by an earthquake off Sumatra, Indonesia.
- On 26 December 2004 a tsunami occurred in the Indian Ocean. It was the result of the Indio-Australian Plate subducting below the Eurasian Plate. It was caused by an earthquake measuring more than magnitude 9. The earthquake caused the seafloor to uplift, displacing the seawater above.
- A tsunami is a series of waves caused by an earthquake, underwater volcanic eruption, landslide or other abrupt disturbance. The most common cause of a tsunami is an earthquake, which is a sudden shifting of the earth's crust, which releases energy. A tsunami can travel as fast as a jet plane in the deep ocean waters.
Scientists can predict the number of named storms and their breakdown by intensity (i.e. the number of hurricanes, tropical storms, intense hurricanes, etc.). They can also predict approximate wind speeds and intensity for sustained winds. Once a hurricane has formed, it can be tracked.
- Earthquakes and tsunamis cannot be predicted. However, once a large earthquake does occur, PTWC can forecast the tsunami behavior if one had been generated. 36.
- Meteorologists use a variety of tools to help them gather information about weather and climate. Some more familiar ones are thermometers which measure air temperature, anemometers which gauge wind speeds, and barometers which provide information on air pressure.
- DURING A HURRICANE:
- Stay away from low-lying and flood prone areas.
- Always stay indoors during a hurricane, because strong winds will blow things around.
- Leave mobile homes and to go to a shelter.
- If your home isn't on higher ground, go to a shelter.
- If emergency managers say to evacuate, then do so immediately.
Updated: 16th October 2019