Muroto, Kōchi

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Muroto
室戸市
City
View of Pacific Ocean from Cape Muroto
View of Pacific Ocean from Cape Muroto
Flag of Muroto
Flag
Official seal of Muroto
Chapter
Location of Muroto in Kōchi Prefecture
Location of Muroto in Kōchi Prefecture
Muroto is located in Japan
Muroto
Muroto
Location in Japan
Coordinates: 33°17′N 134°9′E / 33.283°N 134.150°E / 33.283; 134.150Coordinates: 33°17′N 134°9′E / 33.283°N 134.150°E / 33.283; 134.150
Country Japan
Region Shikoku
Prefecture Kōchi Prefecture
Government
 • Mayor Kenji Komatsu
Area
 • Total 248.25 km2 (95.85 sq mi)
Population (March 31, 2017)
 • Total 14,006
 • Density 56/km2 (150/sq mi)
Symbols
 • Tree Ubamegashi (Quercus phillyraeoides)
 • Flower Hamayū
 • Bird Japanese white-eye
Time zone Japan Standard Time (UTC+9)
City hall address 25-1 Ukitsu, Muroto-shi, Kōchi-ken
781-7185
Website www.city.muroto.kochi.jp

Muroto (室戸市, Muroto-shi) is a city located in Kōchi Prefecture, Japan. The city was founded on March 1, 1951.

As of March 31, 2017, the city has an estimated population of 14,006, with 7,622 households[1] and a population density of 56 persons per km2. The total area is 248.25 km2.

The entire territory of Muroto is "Muroto Global Geopark" which is a member of the Japanese Geoparks Network and Global Geoparks Network since 2011 on account of its outstanding geological heritage, educational programs and projects, and promotion of geotourism.[2]

Geology[edit]

The peninsula is made up of Oligocene to Pleistocene-aged sedimentary rocks and loose Holocene-aged alluvial deposits. The rocks belong to the Shimanto Supergroup, represented in the peninsula as mudstone, and the Tonohama Group made up of chiefly of sandstone and gravel.[3] Several active, WNW-dipping, thrust faults are exposed at the western coast and southern tip of the peninsula. Off-shore west of the Cape Muroto, tip of the peninsula, there faults dips to the west.[3]

There are uplifted marine terraces at Muroto. Dating of these terraces reveal that since their formation in an interval 123 to 96 thousand years ago (k B.P.), in an epoch corresponding to the Eemian interglacial. Since then land in the tip of the peninsula has risen 1.2–1.6 meters every thousand years (m/kyr). Closer to the mainland the uplift rate has been in the order of 0.3–0.7 m/kyr.[3] While these are long-term averages individual large non-megathrust earthquakes are known to have uplifted the coast around one meter. These earthquakes are more rare than megathrust ones occurring every 1000 to 2000 years.[3]

Uplift of the coast has left fossil tube worm colonies attached to rocks on land.[2]

Muroto-Anan Coast Quasi-National Park

References[edit]

  1. ^ "Official website of Muroto City" (in Japanese). Japan: Muroto City. Retrieved 1 May 2017. 
  2. ^ a b Muroto Global Geopark
  3. ^ a b c d Matsu'ura, Tabito (2015). "Late Quaternary uplift rate inferred from marine terraces, Muroto Peninsula, southwest Japan: Forearc deformation in an oblique subduction zone". Geomorphology. 234: 133–150. doi:10.1016/j.geomorph.2015.01.012. 

External links[edit]