Photo Courtesy:  Wikimedia Commons

                        The Oshima-Oshima event near the island of Hokkaido is Japan’s second most destructive volcanic tsunami. Deposits from the Oshima-Oshima tsunami have been found over 5m high in places on the Oshima Peninsula over 50 km from the eruptive site. Records show that 1,467 people lost their lives as a result of the event, which was likely caused by volcanic earthquakes accompanying the 1741 eruption.

hokkaido volcanoes

(1) Oshima-Oshima off the shore of Hokkaido. Map based on Simkin and Seibert (1994).