The most common cause of tsunamis is from undersea earthquakes on the ocean floor. Submarine landslides and volcanic eruptions also cause tsunamis. On very rare occasions, a meteorite impact in the ocean results in a tsunami. Any event that displaces a significant amount of water in a short period of time can cause a tsunami.Know More
Not all undersea earthquakes cause tsunamis. The quake must cause part of the crust to lift up like a gigantic paddle, displacing a large volume of water. If the quake happens deep in the crust or the crust is not displaced significantly, then a tsunami is not likely to occur. Strong, shallow quakes produce more tsunamis. Tsunamis are difficult to detect on the open ocean since the wave does not rise very far above the ocean's surface. As the tsunami approaches shallower water, the water piles up and causes a much taller wave.
Volcanic eruptions also cause tsunamis, such as the waves produced when the Indonesian volcano Krakatoa erupted in 1883. Superheated gas and rock from the volcano flowed into the sea, which displaced a huge volume of water and caused tsunamis. These waves were felt as far away as South Africa. Many villages were destroyed by these waves, and more than 36,000 people died.Learn More
While tropical cyclones are not unheard of in South Africa, they are very rare. However, according to a study by the Wits School of Geography, Archaeology and Environmental Studies, the number of cyclones that strike South Africa may steadily increase in response to increased global warming.Full Answer >
Tornadoes can happen at any time during the year, but are more likely to occur between May and June in the southern area of the United States. In the upper Midwest and northern regions of the United States, tornado season is considered to be in June or July.Full Answer >
Since 1886, the first year that data is available, 41 storms classified as hurricanes have passed within 75 miles of the Houston/Galveston county warning area as of 2014. According to climatecentral.org, a hurricane strength storm is expected strike the Texas coast once every 9 to 16 years.Full Answer >
A lightning arrester protects telecommunication and electrical power systems from damage during a lightning strike. It accomplishes this by redirecting the current in the lightning to the ground.Full Answer >