Introducing the highlights (12 geosites) of the North Izu area

The highlights of the North Izu area
Ayutsubo Waterfalls
The Ayutsubo waterfalls on the Kisegawa river flow down from a cliff of about 10m thick lava that flowed from Mt. Fuji about 10,000 years ago. The soft loam that stopped the lava flow was eroded by the flow of the Kise River, and the remaining hard lava created a waterfalls. You can also observe lava tree mould, rope lava and potholes.
Tanna Fault Park
An active fault was activated in November 1930, and the Kita-Izu earthquake with a magnitude of 7.3 and a seismic intensity of 6 occurred. Many houses were destroyed causing many casualties. At the time of the earthquake, the park was a farmer's house, garden, and field. The strike-slip fault was recorded on the ground by cutting through stone walls, waterways and a circular pond.
Cape Osezaki
Osezaki, which protruded into Suruga Bay, is a sand spit made up of rocks and earth and sand carried by ocean currents along the coast. In the middle of Osezaki is a freshwater pond called Kamike. At the tip, the juniper forest is spreading. Some of the trees are over 1000 years old, and have survived severe natural environments and repeated tsunamis.
Kakitagawa River
The lava that flowed out from the eruption of Mt. Fuji about 10,000 years ago flowed down the valley between Mt. Ashitaka and Hakone, reaching the vicinity of the Kakita River. The groundwater flowing in the lava flow forms a rich spring group in Shimizu and Mishima. The Kakita River is the largest of these springs, and you can observe the springs in the park.
Karai Shrine
An active fault was activated in November 1983, and the Kita Izu Earthquake with a magnitude of 7.3 and a seismic intensity of 6 occurred. The old shrine gate of the Karai shrine at the southern end of the Tashiro basin collapsed, and the Tanna fault separated between the shrine gate and the stone steps, recording a 1.4 meter left-lateral strike-slip fault.
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Rakujuen Park
The lava erupted from Mt. Fuji about 10,000 years ago ran down, and cooled and solidified near Mishima, about 35 km south from the crator. Rakujuen is located at the end. Trees grow naturally on the cracks of the lava in the park. You can observe the micro-topography of the lava flow in various parts of the park. At Kohama pond, spring water from Mt. Fuji springs from summer to autumn.
Mishima Shrine
Mishima Taisha is the most popular shrine on the peninsula. Although there are various theories, Mishima Shrine worships the god of the volcanic island that was once enshrined in the Izu Islands. In order to calm the volcano, the court at that time raised the rank of God and moved to its current location via Shirahama Shrine.
Warikozuka Inari Shrine
On the hill where Inari Shrine is built, there are many torii gates along the cracks in the rock. This rock is lava that flowed from Mt. Fuji about 10,000 years ago. The surface of the flowing lava flows comes into contact with cold air and cools and hardens. The hot lava inside will try to flow down and expand its surface shell, creating a lava mound and cracking its surface.
Ushibuse Mountain
Ushibuse mountain at an altitude of 70m is a remnant of a submarine volcano before Izu hit Honshu. Extremely tenacious lava erupted into the sea floor and formed into a dome shape. It rose when the collision between Izu and Honshu rose, and became a small mountain after erosion. Most of the submarine volcanic products seen on the shore at the foot of Ushibuse moutain are lava flows and debris flows flowing down the sea floor.
Senbonhama Beach
Senbonhama, which slowly curves along the deepest coastline of Sengawa Bay, is a sand bar made of sedimentary soil from the Fuji River. Long sandbars cut out part of the sea and created land behind it. Matsubara, planted for tides and windbreaks, spreads across the sandbars of Senbonhama.
Kashiya Cave Tomb
There are over 300 tombs dug from the end of AD 6 to end of AD8 on the cliffs of the Kashiya plateau. Nearly 200 side-hole tombs in the park have been designated as national historic sites. The cliff where the toms were dug is a tuff with pumice flow erupting from Hakone volcano about 66,000 years ago, and it seems that it was cut with iron flea because it is easy to process.
Kanukiyama Observatory
Mt. Kanuki (193m above sea level) and the Numazu Alps connected to the south are the relics of a submarine volcano before Izu hit Honshu. Even in the steep Numazu Alps, Mt. Kanuki has well-maintained mountain trails and is easy to walk. From Shibazumi Observatory, you can see the Numazu city and Suruga Bay below, and the Southern Alps.