Underwater landslides

Seafloor (dark gray) off the U.S. East Coast, showing areas of past landslides (blue). Underwater landslides are the primary source of potential tsunamis on this coast. Figure 1 from the journal article titled, “Morphology of late Quaternary submarine landslides along the U.S. Atlantic continental margin,” in the “Tsunami hazard along the U.S. Atlantic coast,” a special issue of Marine Geology. Courtesy of David Twichell, USGS.