| Scientists have mapped one of the most hazardous spots on the globe in unprecedented detail: a 600-mile geologic boundary just off the coast. Along this fraught stretch, mapped in a study published Friday in the journal Science Advances, two pieces of the Earth's crust slide against each other, building up stresses capable of unleashing a 9.0-magnitude earthquake and generating a tsunami, with waves as high as 40 feet. | 
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