[M-IS24] History X Earth and Planetary Science

[MIS24-P03] Records of Tsunami and Ground Uplift from the 1703 Genroku Earthquake in the Miura Peninsula: Evidence from Historical Village Documents

*Junzo Ohmura¹, Yasuyuki Kano¹ (1.Earthquake Research Institute,The University of Tokyo)

Keywords:Historical Earthquake, 1703 Genroku earthquake, Upheaval of the ground, Tsunami

Historical documents provide evidence for morphological changes in Miyata Port, Miura Peninsula, caused by the 1703 Genroku Earthquake. Two historical records - the "Village Records of Shimomiyata, Miura County" (1821) and the "Coastal Map of Zu-so Region" (1843) - describe that the port became shallower due to the earthquake tsunami, with the latter specifically noting that "large ships could no longer enter the port." These descriptions suggest coseismic ground uplift, which corresponds to the previously estimated uplift of 1.1-1.7 m in the southern Miura Peninsula based on fossil marine organisms [Shishikura and Echigo (2002)]. However, the historical documents do not provide quantitative data on tsunami height or amount of uplift, which requires further investigation.

The morphological changes appear to have influenced local land use, potentially triggering land reclamation projects that began in 1708. While Miyata Port has been completely reclaimed and converted to land since the 1960s, further research is needed to fully understand the impact of the Genroku Earthquake and subsequent land-use changes in this area. This case study, which is not currently included in the tsunami trace database, offers an additional perspective on the historical seismology of the region through documentary evidence.