Tsunami deposits identified in a coastal mangrove pond in Northwest Puerto Rico could have come from a megathrust earthquake at the Puerto Rico Trench that occurred between 1470 and 1530, according to ...

Mr. Eldridge Johnson approached the Smithsonian Institution offering the use of his yacht Caroline, to be completely outfitted, at his own expense, with the most modern devices for oceanographic work.

The most accessible part of the earth’s interior is at the ocean’s bottom, where the crust is thin. Project Mohole, the U.S. attempt to reach the boundary layer between the earth’s crust and mantle by ...

GEOLOGY OF THE COAMO AREA PUERTO RICO AND ITS RELATION TO THE VOLCANIC ARCTRENCH ASSOCIATION BY LYNN GLOVER III PREPARED IN COOPERATION WITH THE COMMONWEALTH OF ...