How did Hess visualize the deep ocean trenches (e.g the Peru-Chile trench)with their earthquakes that extended hundreds of kilometres beneath the ocean floor?

Name: How did Hess visualize the deep ocean trenches (e.g the Peru-Chile trench)with their earthquakes that extended hundreds of kilometres beneath the ocean floor?
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The Answer of How did Hess visualize the deep ocean trenches (e.g the Peru-Chile trench)with their earthquakes that extended hundreds of kilometres beneath the ocean floor?

How Did Hess Visualize the Deep Ocean Trenches (E