A 6.9 magnitude earthquake in the Hyuga-nada Sea, at a depth of 18.6 miles, triggered a tsunami alert in Japan. The Japan Meteorological Agency reported the quake and the alert. The tsunami is ...

owned by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC). It can dive to a depth of 6,500 meters and has conducted about 1,800 deep-sea explorations to date.

Sludge carpeted the water's edge. Waves during high tide lapped onto charred homes, pulling debris and potentially toxic ash into the ocean as they receded. “It was just heartbreaking,” said Quinn, ...

Analyses of sediment cores from the Pacific Ocean's Japan Trench ... colleagues analyzed 20 sediment cores from 7.5 km depth across the Japan Trench of Holocene sediments. X-ray scanning was ...