Tokachi-Mitsumata Caldera

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Tokachi-Mitsumata Caldera Tokachi Mitsumata Caldera Relief Map, SRTM-1.jpg
Tokachi-Mitsumata Caldera

Tokachi-Mitsumata Caldera is an 8-km wide volcanic caldera in the Ishikari Mountains of Daisetsuzan National Park in Hokkaidō, Japan.

The caldera is bounded to the north by the Ishikari Mountains and to the southwest by the Nipesotsu-Maruyama Volcanic Group.

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A caldera is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is gone. The ground surface then collapses into the emptied or partially emptied magma chamber, leaving a large depression at the surface. Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Compared to the thousands of volcanic eruptions that occur each century, the formation of a caldera is a rare event, occurring only a few times per century. Only seven caldera-forming collapses are known to have occurred between 1911 and 2016. More recently, a caldera collapse occurred at Kīlauea, Hawaii in 2018.

<span class="mw-page-title-main">Mount Aso</span> Volcano in Kumamoto Prefecture, Japan

Mount Aso, is also known as Aso Volcano and in this sense is the largest active volcano in Japan, and is among the largest in the world. Common use relates often only to the somma volcano in the centre of the Aso Caldera. It stands in Aso Kujū National Park in Kumamoto Prefecture, on the island of Kyushu. Its tallest peak, Takadake, is 1,592 meters (5,223 ft) above sea level. Mount Aso is in a fairly large caldera with a circumference of around 120 km (75 mi), although sources vary on the exact distance.

<span class="mw-page-title-main">Daisetsuzan National Park</span> National park in Hokkaidō, Japan

Daisetsuzan National Park, or Taisetsuzan is located in the mountainous center of the northern Japanese island of Hokkaidō. At 2,267.64 square kilometres (875.54 sq mi), Daisetsuzan is the largest national park in Japan, and is approximately the size of Kanagawa Prefecture. Daisetsuzan, meaning "great snowy mountains", an apt description of these peaks. There are 16 peaks over 2,000 metres (6,600 ft) in Daisetsuzan National Park, both with and without trails. The park offers some of the most rugged scenery in Japan. Asahidake, located in the north of the park, is the highest peak in Hokkaidō. Daisetsuzan National Park spans two subprefectures of Hokkaidō, Kamikawa and Tokachi. Daisetsuzan National Park was established in 1934.

<span class="mw-page-title-main">Kamikawa (Ishikari) District, Hokkaido</span>

Kamikawa is a district located in Kamikawa Subprefecture, Hokkaido, Japan. Confusingly, there is a district of the same name, Kamikawa (Teshio) District, in the h. subprefecture. In 1869, when Hokkaido was divided into 11 provinces and 86 districts, this Kamikawa District was placed under Ishikari Province. The name is derived from its location at the headwaters of the Ishikari River, whereas the other Kamikawa District is named after the headwaters of the Teshio River. There is a third district in Hokkaido with the same name, see Kamikawa (Tokachi) District.

<span class="mw-page-title-main">Ishikari River</span> Longest river in Hokkaidō, Japan

The Ishikari River, at 268 kilometres (167 mi) long, is the third longest in Japan and the longest in Hokkaidō. The river drains an area of 14,330 square kilometres (5,530 sq mi), making it the second largest in Japan, with a total discharge of around 14.8 cubic kilometres (3.6 cu mi) per year.

<span class="mw-page-title-main">Asahi-dake</span> Stratovolcano on the island of Hokkaido

Mount Asahi is a mountain located near the town of Higashikawa, Hokkaido and the tallest mountain on the Japanese island of Hokkaido. It is part of the Daisetsuzan Volcanic Group of the Ishikari Mountains, it is located in the northern part of the Daisetsuzan National Park.

<span class="mw-page-title-main">Mount Tokachi (Daisetsuzan)</span> Active volcano on the island of Hokkaido, Japan

Mount Tokachi is an active volcano located in Daisetsuzan National Park, Hokkaidō, Japan. It is the tallest volcano of the Tokachi Volcanic Group, with a height of 2,077 metres (6,814 ft). It is one of the 100 famous mountains in Japan.

<span class="mw-page-title-main">Daisetsuzan Volcanic Group</span> Volcanic group on the island of Hokkaido

The Daisetsuzan Volcanic Group is a volcanic group of peaks arranged around the 2 kilometres (1.2 mi) wide Ohachi-Daira caldera in Hokkaidō, Japan. In the Ainu language it is known as Nutapukaushipe, Nutaku Kamushupe, or Optateske. These peaks are the highest in Hokkaidō. The group lends its name to the Daisetsuzan National Park in which the volcanic group is located.

<span class="mw-page-title-main">Aogashima</span> Volcanic island in the Philippine Sea

Aogashima (青ヶ島) is a volcanic island to the south of Japan in northernmost Micronesia. It is the southernmost and most isolated inhabited island of the Izus, which are politically and administratively part of Japan but geographically not part of the Japanese archipelago. The islands border the northeast Philippine Sea and lie immediately north of the Bonin Islands, which are also governed by Japan. The island is approximately 358 kilometres (222 mi) south of Tokyo and 64 kilometres (40 mi) south of Hachijō-jima.

<span class="mw-page-title-main">Biei Fuji</span>

Biei Fuji is a mountain located in the Tokachi Volcanic Group, Hokkaidō, Japan.

Mount Mamiya is located in the Daisetsuzan Volcanic Group of the Ishikari Mountains, Hokkaidō, Japan. It sits on the western rim of the Ohachidaira caldera.

Mount Naka is located in the Daisetsuzan Volcanic Group of the Ishikari Mountains, Hokkaido, Japan. It sits on the north rim of the Ohachidaira caldera.

<span class="mw-page-title-main">Mount Kuro (Hokkaido)</span> Lava dome on the island of Hokkaido

Mount Kuro is a lava dome located in the Daisetsuzan Volcanic Group of the Ishikari Mountains, Hokkaidō, Japan.

Mount Matsuda is a mountain located in the Daisetsuzan Volcanic Group of the Ishikari Mountains, Hokkaidō, Japan. It sits on the southern rim of the Ohachi Taira caldera.

<span class="mw-page-title-main">Mount Nipesotsu</span> Lava dome on the island of Hokkaido, Japan

Mount Nipesotsu is a lava dome located in the Nipesotsu-Maruyama Volcanic Group of the Ishikari Mountains, Hokkaido, Japan.

Mount Maru is a lava dome located in the Nipesotsu-Maruyama Volcanic Group of the Ishikari Mountains, Hokkaidō, Japan. Mount Maru is also known as Higashi-Tokachi-Maruyama (東十勝丸山) or Higashi-Taisetsu-Maruyama (東大雪丸山) to distinguish it from other mountains with the same name. Only in 1989 did scientists discover that Mount Maru is a quaternary volcano. The mountain sits on the border between the towns of Kamishihoro and Shintoku.

<span class="mw-page-title-main">Northeastern Japan Arc</span> Island arc on the Pacific Ring of Fire

The Northeastern Japan Arc, also Northeastern Honshū Arc, is an island arc on the Pacific Ring of Fire. The arc runs north to south along the Tōhoku region of Honshū, Japan. It is the result of the subduction of the Pacific Plate underneath the Okhotsk Plate at the Japan Trench. The southern end of the arc converges with the Southwestern Japan Arc and the Izu–Bonin–Mariana Arc at the Fossa Magna at the east end of the Itoigawa-Shizuoka Tectonic Line (ITIL). This is the geologic border between eastern and western Honshū. Mount Fuji is at the point where these three arcs meet. To the north, the Northeastern Japan arc extends through the Oshima Peninsula of Hokkaidō. The arc converges in a collision zone with the Sakhalin Island Arc and the Kuril Island Arc in the volcanic Ishikari Mountains of central Hokkaidō. This collision formed the Teshio and Yūbari Mountains.

<span class="mw-page-title-main">Central Ishikari Mountains</span>

The Central Ishikari Mountains, or more commonly referred to simply as the Ishikari Mountains, are a group of mountains in central Hokkaidō, Japan.

<span class="mw-page-title-main">Mount Oputateshike</span>

Mount Oputateshike is a mountain of the Tokachi Volcanic Group.

<span class="mw-page-title-main">Ibusuki volcanic field</span> Volcanic area on the island of Kyushu, Japan

The Ibusuki volcanic field, also known as the Ibusuki Volcano or Ibusuki Volcanic Group (指宿火山群), is an area of current volcanic and geothermal activity at the tip of the Satsuma Peninsula, Kagoshima prefecture, Kyushu, Japan. It is administered as part of Ibusuki City and Kirishima-Kinkowan National Park.


Coordinates: 43°31′00″N143°09′00″E / 43.516667°N 143.15°E / 43.516667; 143.15