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" ... The era of modern seismology—the scientific study of earthquakes—began with the invention of the seismograph in the late 19th century and its deployment in instrument networks in the early 20th century to record and measure earthquakes as they occur. Therefore, when the animation begins only the largest earthquakes will appear. They were the only ones that could be detected at great distances with the few instruments available at the time. But as time progressed, more and more seismographs were deployed and smaller and smaller earthquakes could be recorded. For example, the installation of these instruments in California in the 1930s creates the illusion of new earthquake activity there. Likewise, there appears to be a jump in the number of earthquakes globally in the 1970s when seismology took another leap forward with advances in telecommunications and digital signal processing, a trend that continues today. ... "