Asahi-dake : History, Geology Wikipedia, the free encyclopedia

Asahi-dake

Stratovolcano on the island of Hokkaido

Mount Asahi

Location of Mount Asahi in Japan.

LocationHigashikawa, Kamikawa Subprefecture, Hokkaido, JapanParent rangeDaisetsuzan Volcanic GroupTopo mapGeographical Survey Institute 25000:1 旭岳
25000:1 愛山溪温泉
50000:1 大雪山
50000:1 旭岳GeologyAge of rockHolocene^[3]Mountain typeStratovolcano^[2]Last eruption1739

Mount Asahi (旭岳, Asahi-dake) 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.

Its native Ainu name is Kamui-mintara, which means "the playground of the gods".^{[citation needed]}

The mountain is popular with hikers in the summer and can be easily reached from Asahidake Onsen via Asahidake Ropeway. During winter, the mountain is open for use by skiers and snowboarders.

Sugatami Pond, directly below the peak, is famous for its reflection of the peaks, snow, and steam escaping from the volcanic vents.

History

Sulphur was once mined in the fumarolic areas.^[2]

Geology

Mount Asahi is an active stratovolcano, 2,291 metres (7,516 ft) in height^[2] that arose 3 kilometres (1.9 mi) southwest of the Ohachi-Daira caldera.^[2] The Japan Meteorological Agency gave the region rank C^[4] in volcanic activity. The volcano consists mainly of andesite and dacite,^[4] Holocene volcanic non-alkali mafic rock less than 18,000 years old.^[3] In addition to the main peak, there is a smaller volcano emerging from the southeast shoulder of the mountain, Mount Ushiro Asahi or Rear Mount Asahi (後旭岳, Ushiro-Asahi-dake).

Eruptive history

Whilst there is no historical record of the eruptions of Mount Asahi, tephrochronology and radiocarbon dating have determined the following events:^[2]

3200 BC ± 75 years, Asahi Soria deposit, corrected radiocarbon dating, explosive eruption
2800 BC ± 100 years, As-A tephra, corrected radiocarbon dating, explosive eruption and phreatic explosions
1450 BC ± 50 years, As-B tephra, uncorrected radiocarbon dating, explosive eruption and phreatic explosions
500 BC ± 50 years, Ash-b tephra, tephrochonology, explosive eruption and phreatic explosions and debris avalanches
1739, tephrochronology, explosive eruption and phreatic explosions with possible eruption of the central vent and radial good

Mount Asahi currently exhibits steam activity in the form of fumaroles.^[4]

References

^ Geological Survey Institute Archived 2011-05-27 at the Wayback Machine topographic map Asahi-dake 旭岳
^ ^a ^b ^c ^d ^e "Daisetsu". Global Volcanism Program. Smithsonian Institution. Retrieved 2008-07-09.
^ ^a ^b "Seamless Digital Geological Map of Japan". Geological Survey of Japan. Advanced Industrial Science and Technology. 2007. Archived from the original on 2013-01-23. Retrieved 2008-07-09.
^ ^a ^b ^c "Quaternary Volcanoes in Japan". Geological Survey of Japan. National Institute of Advanced Industrial Science and Technology (AIST). 2006. Archived from the original on 2008-03-22. Retrieved 2008-07-09.

"Asahi-dake, Japan". Peakbagger.com.
Watanabe, Teiji and Hauser, Markus. ASAHI-DAKE: The heart of the Daisetsuzan National Park. Hiking map 1:25,000. Alice Inc. (2017) ISBN 4906740278