Seismographs

=Seismograph=

==Earthquakes are destructive natural disasters that cause mass destruction and costs the lives of thousands of people. So predicting them and figuring out how strong they are and will be. A seismograph is a device that measures the amount of shaking caused by the earthquake. These seismographs generate seismograms which are the lines in the seismograph. These seismographs usually show that the primary waves come first then the secondary waves and the stronger surface waves. There are also 3-component seismographs which measure the movement of earthquakes, the three movements are 1) east to west movement 2) north to south movement and 3) vertical movement. These devices help locate earthquakes by lag time and triangulation where they measure the time between the seismic waves and then use three stations around the world or in the same area to find the epicenter or focus ( where the earthquake came from) of the earthquake and try to save lives.==

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