Topography and background of the Kanbe area
～Land formed by uplift of sand dunes and terraces～
As shown in the plate schematic diagram, the Boso Peninsula is located on the North American Plate, but it has a three-layered structure, with the Philippine Sea Plate subducting from the Sagami Trough below it, and the Pacific Plate subducting from the Japan Trench below it. .
As a result, repeated large earthquakes caused upheavals, forming sand dunes and terraces, and expanding the land.
The Tateyama city area and the area around Hirasaura coast are covered with sand dunes, while the Tomisaki area and eastern Kanbe are made up of terraces, and faults can be seen in various locations.
Even in Kanbe, the area on the Heisaura side has had a long history of fighting against flying sand. Fossils of pottery and shells from the Jomon period can be found near Ryuoka Ward in the east.
This shows that this area is a coastline and that villages have existed since ancient times.
Furthermore, ritual artifacts thought to date back to the Kofun period have been unearthed in the Tomoe River basin, indicating that this area has been used as a place for rituals since ancient times, with a growing settlement.
Afterwards, many shrines and temples were built, centering on Awa Shrine and Sunomiya Shrine, and the area came to be known as “ Kanbe” as a village for people who served the gods.
Boso Peninsula
The topography of the Boso Peninsula is that the northern part has coastal plains, plateaus, and sandy beaches, while the southern part is undulating hills below 400 m above sea level. Many of the coasts have become rocky due to sea level changes and tectonic movements over the years.
Plats Near Japan
East Japan is on the North American Plate, and western Japan is on the Eurasian Plate, and below the sea surface in the west, the Philippine Sea Plate is subducting from both the Nankai Trough and Sagami Trough trenches. Furthermore, off the coast of Boso, there is a complex structure in which the Pacific plate subducts beneath the Japan Trench. As a result, repeated large earthquakes have caused it to rise, not only changing the coastline but also forming hills.
