A map of the ocean floor north of Puerto Rico, used by the U.S. Geological Survey and the Woods Hole Oceanographic Institution, displays the areas of focus for scientific research. The purpose of the research is to record seismic data for approximately one year to supplement data from land-based seismographs operated by the Global Seismograph Network, the Puerto Rico Seismic Network, and others. (Map courtesy of the U.S. Geological Survey and the Woods Hole Oceanographic Institution)