As a young seismologist in the 1960s, Lynn Sykes made crucial observations of earthquakes under the ocean floors that helped solidify the theory of plate tectonics—the foundation of modern geology. Later, hoping to apply his discoveries to saving lives, he helped identify zones prone to great earthquakes, particularly along coastlines. He also went on to assess the risks that earthquakes pose to nuclear power plants, and to advance the use of seismology to detect nuclear-bomb tests.
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Source: Phys.org