The instrument used to measure earthquakes is called a seismograph. This tool helps the movements of the earth and recorded in the seismograms. Seismic waves or vibrations when an earthquake occurs in the form of wavy lines drawn on the seismogram. To determine how big the magnitude on the Richter scale was used.
Seismograms was first created in China in the year 150 AD, kettle-shaped carved dragon head attached on the outside. Earthquake causes tremors caused balls falling from the dragon's mouth and into the field below. Place balls had dropped the dots indicate the earthquake epicenter.
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