Depth Change of Murotsu Port and Coseismic Uplift Since Enpou Period

Abstract

Murotsu Port in Kochi Prefecture faces the Nankai Trough and is a rare location in the world where uplift due to three historical earthquakes has been recorded: the 1707 Hoei earthquake, the 1854 Ansei Nankai earthquake, and the 1946 Showa Nankai earthquake (Figure 1). In this report, we use the Kubono family documents and other historical documents to examine the changes in the port's depth from 1640 to 1845, which are relevant to estimating the amount of earthquake uplift.