User:Tomoyuki6/sandbox

Draft

History
The upper part of Japanese islands was created at the edge of Eurasian plate 180 million years ago. Then, 50 million years later, the lower part was created at the southern part of Yangtze continent. the lower part then rode on Izanagi plate and moved to the upper part. these islands were incorporated and formed Japanese islands 70 million years later. The boundary line between the upper part and lower part is the MTL.

Seismic activity
Although MTL is a less seismic activity region compared to others, earthquakes with magnitude 6-7 have occurred.

The important part of the MTL is called MTL fault zone (中央構造線断層帯) where it is an active fault of the MTL and considered one of the hazard active faults. It is separated by six regions defined as the oldness of seismic activities. It is considered the oldest activity had occurred about 3000 years ago, and the newest one had occurred in the 16 century. Also, it is expected that the seismic activities in future. The boundary of the regions still has been discussed, so the regions are not defined well.

1. East edge of Kongo mountains (located between Oosaka prefecture and Nara prefecture) ・Expected size of the earthquake: Magnitude 6.7 ・Probability of the earthquake occurring: 0 ~ 5% within 30 years ・newest activity occurring: 2000 years ago ~ in the fourth century 2. South edge of Izumi mountains (located between Oosaka prefecture and Wakayama prefecture) ・Expected size of the earthquake: Magnitude 7.6　~ 7.7 ・Probability of the earthquake occurring: 0.07 ~ 14% within 30 years ・newest activity occurring: In the seventh century ~ ninth century 3. Kitan channel - Naruto channel (located between Wakayama prefecture and Hyougo prefecture - Hyogo prefecture and Tokushima prefecture) ・Expected size of the earthquake: Magnitude 7.6 ~ 7.7 ・Probability of the earthquake occurring: 0.005 ~ 1% within 30 years ・newest activity occurring: 3100 years ago ~ 2600 years ago 4. Sanuki mountains - Eastern part of north edge of Ishizuchi mountains (located between Kagawa prefecture and Tokushima prefecture - Ehime prefecture and Kouchi prefecture) ・Expected size of the earthquake: Magnitude 8 ・Probability of the earthquake occurring: 0 ~ 0.4% within 30 years ・newest activity occurring: In the sixteenth century 5. North edge of Ishizuchi mountains (located between Ehime prefecture and Kouchi prefecture) ・Expected size of the earthquake: Magnitude 7.3 ~ 8 ・Probability of the earthquake occurring: 0 ~ 0.4% within 30 years ・newest activity occurring: In the sixteenth century 6. Western part of south edge of Ishizuchi mountains - Iyonada (located between Ehime prefecture and Kouchi prefecture - Southern part of Seto inland sea) ・Expected size of the earthquake: Magnitude 8 or above ・Probability of the earthquake occurring: 0 ~ 0.4% within 30 years ・newest activity occurring: In the sixteenth century

Kyushu
The MTL certainly lies on the Kunisaki Peninsula through the Saganoseki Peninsula which are the parts of Ooita prefecture. However, because it is covered by the volcanic rocks, it is unclear where the MTL at the central part of Kyushu lies on. Generally, it is considered the MTL goes from Usugi through Yaesiro. Also, there is a hypothesis that the MTL lies on Ooita prefecture through Kumamoto Prefecture.

Sikoku
The MTL goes from Tokushima-shi, the city of Tokushima prefecture, to the north coast of Yosino river, where it flows Kouchi prefecture trough Tokushima prefecture. Then, it reaches to Miyoshi-shi, the city of Tokushima Prefecture. Then, it passes through Kawanoe-shi, Niihama-shi, which are cities of Ehime prefecture, and Tobe-cho, downtown of Ehime prefecture. From the Tobe-cho, it goes to Iyo-shi, the city of Ehime prefecture. Then, it reaches to Houyo Channel. At Houyo Channel, the MTL passes through the coast of Saganoseki Peninsula and Sadamisaki Peninsula.

Kinki
At the Kii Peninsula, the MTL passes from Kinogawa river to the north part of Yoshino river, then reaches Wakayama-shi and part of Mie prefecture.

Tyubu
The MTL goes from Shizuoka prefecture to Nagano prefecture. At Nagano prefecture, it lies between the Ina mountains and the Akaishi mountains. Then, it goes to Tino-shi, the northern part of Nagano prefecture.

Kanto
The MTL lies from Shimotani-cho, downtown of Gunma prefecture, to the Hiki hills located at Saitama prefecture. Then it continues to the Kanto plains. At the central part Kanto plains, it was researched that the MTL lies 3000 meters under the ground of Saitama prefecture. From there, it dose not clear where the MTL goes to, but it is considered the MTL passes through Ibaragi prefecture.