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The modern seismograph was invented in the early 20th century by a Russian seismologist,

Prince Boris Golitzyn. His device used a magnetic pendulum suspended between the poles of an electromagnet, created the

modern era of earthquake research.

There are three general classes of earthquakes that are now recognized: tectonic, volcanic, and artificially produced...

The

tectonic kind is by far the most devastating, and these earthquakes create many difficulties for scientists trying to develop ways

to predict them. The main cause of tectonic earthquakes is stress set up by movements of the dozen major and minor plates

that make up the earth's crust. Most tectonic quakes occur at the boundaries of these plates, in zones where one plate slides

past another, such as at the San Andreas Fault in California, North America's most quake-prone area, or where one plate

slides beneath the other plate, subduction...

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