Looking up the valley from the seaside you can see the deposits from the old Unzen Volcano on the right (south side) and the deposits from a midterm volcano (approx. 150,000 to 300,000 years ago) on the left (north side). As the Unzen Trough Fault kept subsiding through volcanic eruptions, the deposits from the midterm volcano could not reach beyond the south of the Kanahama Fault.
It's amazing to see the effects of events that happened hundreds of thousands of years ago and how they still exist and create a huge impact today. I used to enjoy the scenery and drive endlessly around the Peninsular but today with the knowledge I have obtained with the Geopark materials that are available I am able to enjoy in more detail the amazing places that are still within a stones throw away. Please let me know if you would like more information on Nagasaki Geopark in English and I can help you obtain them.
Check out the Kanahama Fault Nagasaki Geopark on a map!