Late Quaternary Tephrostratigraphy of Marine Core KH94-3, LM-8 off Sanriku, Japan

摘要

A piston core (KH94-3, LM-8) was collected from the continental slope off the Sanriku dis- trict, east coast of northeast Japan. This core contains 14 tephra layers, the lowest of which is Aso-4. Identification of these tephras, based on the chemical compositions of the volcanic glass and the reflective indices of glass shards and minerals, indicate that there are wide- spread tephra from distal volcanoes in the Kyushu, Chugoku, and Hokkaido areas, as well As from the several volcanoes in the Tohoku District adjacent to the Sanriku.