Two humic silty layers were found at the level of +8.0m and +8.5m above sea level in the sediments of the Nakanawa archaeological site near Kuwana, central Japan. Radiocarbon age of the lower layer is dated as 2040±100yrs BP, and the layer is considered to have been deposited in a marine or brackish environment near the coast judging from the diatom assemblage.
These facts show that the site has uplifted at a rate of ca 4m/1000 yrs since 2000 yrs BP, and this implies that the Kuwana fault is A-class active fault.
Many tracks of sandblow are also found in the sediments of the site, and the uplifting movements are considered to have been associated with the historical earthquakes such as the Kaho earthquake in1096 and Tensho earthquake in 1586.