By Ellen Prager
Describes how plate tectonics and shifts within the Earth's crust reason earthquakes and volcanoes, and explains the chance at the back of the occasions and the way the hazards related to them should be reduced...Title: .Earthquakes and Volcanoes..Author: .Prager, Ellen..Publisher: .Facts on File..Publication Date: .2008/10/01..Number of Pages: .118..Binding style: .LIBRARY..Library of Congress: .2008008777
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Scientists also combine data from undersea seismic stations and bottom pressure sensors with computer models to better predict where, when, and how a tsunami may strike. These models can help to identify the areas most at risk, generate appropriate warnings, and assist in making decisions about evacuations. For tsunami warnings to be effective, local communities must also have the means to receive the alerts and pass them on to the people in the areas at risk, who then need to know what to do. In the 2004 Indian Ocean tsunami, the inability to alert people about the tsunami and the warning signs ahead of time contributed to the tragedy.
Molecules back and forth, in the same direction that they are traveling. If you take a long spring such as a Slinky, stretch it, and then tap one end of the spring, a wave travels down its length by moving sections to and fro. This action is similar to the compressional motion of a P-wave. P-waves can pass through both solids and liquids, and their speed increases as the density of the material they are passing through increases. Secondary waves, or S-waves, do not travel as quickly as P-waves.
Earthquakes, volcanic eruptions, landslides, or asteroid impacts can trigger a tsunami. During the last decade or so, researchers have discovered that many tsunamis are generated when earthquakes cause underwater landslides. 0 magnitude earthquake 53 54 EarThqUakES aNd VOlCaNOES Survivors walk through the devastated city of Banda Aceh in Indonesia five days after the 2004 Indian Ocean tsunami. struck 13 miles (21 km) away and triggered a huge landslide into the bay. This landslide created waves estimated to have reached an incredible 1,500 feet (450 m) in height.
Earthquakes and Volcanoes by Ellen Prager