The science behind tsunamis | National Oceanic and Atmospheric ...
6 天之前 · In addition to vast coastal water-level stations, NOAA has 39 Deep-ocean Assessment and Reporting of Tsunami (DART®) sea-level systems located strategically throughout the Pacific and Atlantic Ocean basins, the Gulf of Mexico and the Caribbean Sea. The DART systems help identify early detection, measurement and real-time reporting of tsunamis ...
Tsunamis - National Oceanic and Atmospheric Administration
2018年10月1日 · A tsunami is a series of extremely long waves caused by a large and sudden displacement of the ocean, usually the result of an earthquake below or near the ocean floor. This force creates waves that radiate outward in all directions away from their source, sometimes crossing entire ocean basins.
Tsunami Propagation - National Oceanic and Atmospheric Administration
2023年4月10日 · In the deep ocean, tsunamis can move as fast as a jet plane, over 500 mph (800 km/h), and can cross entire oceans in less than a day. The distance between waves is the wavelength.
Tsunami | Definition, Meaning, & Facts | Britannica
6 天之前 · Tsunami, catastrophic ocean wave usually caused by a submarine earthquake, by a landslide, or by a volcanic eruption. In deep water it travels as fast as 800 km (500 miles) per hour, with enormous wavelengths of more than 500 km (310 miles) but small wave amplitudes of about 30 to 60 cm (1 to 2 feet).
Tsunami Facts and Information - National Geographic
Tsunamis race across the sea at up to 500 miles (805 kilometers) an hour—about as fast as a jet airplane. At that pace, they can cross the entire expanse of the Pacific Ocean in less...
What is a tsunami? - NOAA's National Ocean Service
Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. They speed along as fast as jet planes. As they near land, these waves rear up to great heights and can drown whole islands.
U.S. Tsunami Warning Centers
2013年3月27日 · Tsunami warnings are typically issued following coastal earthquakes magnitude 6.5 or greater for U.S. and Canadian Atlantic and Gulf coasts, and magnitude 7.1 or greater for all coasts along the Pacific Ocean and Caribbean Sea. Tsunami height also affects alert selection.
Tsunami Facts: How They Form, Warning Signs, and Safety Tips
2007年4月2日 · A tsunami is a series of great sea waves caused by an underwater earthquake, landslide, or volcanic eruption. More rarely, a tsunami can be generated by a giant meteor impact with the ocean.
What are tsunamis? | U.S. Geological Survey - USGS.gov
If you hear a tsunami warning or if you feel strong shaking at the coast or see very unusual wave activity (e.g., the sea withdrawing far from shore), it is important to move to high ground and stay away from the coast until wave activity has subsided (usually several hours to days).
The 2004 tsunami killed hundreds of thousands. Are we better …
21 小时之前 · An Indian Ocean tsunami blind spot. On December 26, 2004, a seismometer in Australia detected a large quake off the coast of northern Sumatra in the Indian Ocean (SN: 1/5/05).Researchers at the ...
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