Fig. 3

Observed heights of paleo-shorelines in the Boso and Miura peninsulas. a Map of observation sites. Triangles indicate observation sites; no. 1 to 7 are in the Miura area, no. 8 to 18 are in the Uchibo area (the Tokyo Bay side of the Boso peninsula), and no. 19 to 30 are in the Sotobo area (the Pacific Ocean side of the Boso peninsula). The locations of the Genroku shoreline and the Numa III (or Nobi III) shoreline are slightly different, but almost the same in this figure scale. b Observed heights of paleo-shorelines. The solid diamonds and squares indicate the heights of the Genroku shoreline and the Numa III and Nobi III shorelines formed at about 3 kyr BP, respectively. The broken lines indicate the average for the Uchibo area (site no. 8–18) and the southernmost Boso area (site no. 19–22) and the linear trend for the southeast Boso area (site no. 23–30). The data are based on Shishikura (2000b, 2001) and Shishikura and Echigo (2001) for the Genroku shoreline, Nakata et al. (1980) and Shishikura (2000a) for the Numa III shoreline, and Kumaki (1982) for the Nobi III shoreline