how do scienist know stuff about earthquakes?

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    Earthquakes have been studied for thousands of years, which allows us to understand this natural and sometime catastrophic phenomena. The first seismograph was invented in 132 A.D. in China by Chang Heng. His so-called “earthquake weathercock”  had the ability to not only recognize an earthquake but tell which directions it originated from. Today, scientists use state-of-the art seismographs that recorded the strength of each quake as it happens. Seismographs have a pen, paper, and a drum that will draw squiggly lines on the paper during a quake, and depending on the length of the drawings we can determine the strength of each earthquake. The strength is measured in increments called magnitudes using the Richter scale.

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