Pictured is a seismograph, which is used to measure earthquakes. According to Saint Louis University earth sciences professor, Dr. Keith Koper, seismographs, such as this one, can detect major earthquakes all the way from China. The biggest earthquake ever detected, which occurred in Chile, was magnitude 9.5 on the Richter scale. Each magnitude is 10 times bigger than the one before it.




  1. This could be a good article if the author made more of an effort to go into more detail on the sciences on how the seismograph detects earthquakes at its focus and around its epicenter. Also could have explained the different wave types it can detect.