m was recorded on the western part of the island near Monai. A tsunami was widely observed in the Sea of Japan with a run-up of 3.5 m at Akita in northern Honshu, up to 4.0 m in southeastern Russia and up to 2.6 m on the coast of South Korea. Landslide The Okushiri-port landslide involved a volume of 1.5 x 105 m3 of rock. The slide failure occurred at the base of a volcanic breccia bed. The slide occurred in two phases that may match the two separate shocks recorded for the earthquake. Aftermath The destructive power of this tsunami led to an overhaul of the sea defences on Okushiri involving the construction of tsunami sluices on a river and strengthened embankments. New escape routes were also provided and help was given for households to purchase emergency broadcast receivers. See also List of earthquakes in 1993 List of earthquakes in Japan 1993 Kushiro earthquake References External links Earthquakes of the Heisei period Tsunamis in Japan History of Hokkaido Hokkaido 1993 tsunamis Hokkaidō earthquake 1993 Hokkaidō earthquake July 1993 events in Asia