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Mount Asama
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==Geology== Mount Asama sits at the conjunction of the [[Izu–Bonin–Mariana Arc]] and the [[Northeastern Japan Arc]].<ref name="Smithsonian">{{cite gvp|vnum=283110|title=Asama|access-date=2 February 2009}}</ref> The mountain is built up from non-alkali mafic and pyroclastic volcanic rocks dating from the [[Late Pleistocene]] to the [[Holocene]].<ref name="Semless">{{cite web|url=http://riodb02.ibase.aist.go.jp/db084/Hokurikuzoom_e.html|title=Hokuriku|year=2007|work=Seamless Digital Geological Map of Japan|publisher=Geological Survey of Japan, AIST|access-date=2 February 2009|url-status=dead|archive-url=https://web.archive.org/web/20090206100915/http://riodb02.ibase.aist.go.jp/db084/Hokurikuzoom_e.html|archive-date=6 February 2009}}</ref> The main rock types are [[andesite]] and [[dacite]].<ref name="QVoJ"/> [[File:AsamaYamaS.jpg|thumb|200px|left|Viewed from the north]] Scientists from the [[University of Tokyo]] and [[Nagoya University]] completed their first successful imaging experiment of the interior of the volcano in April 2007. By detecting sub-atomic particles called [[muons]] as they passed through the volcano after arriving from space, the scientists were able gradually to build up a picture of the interior, creating images of cavities through which lava was passing deep inside the volcano.<ref>{{cite journal | bibcode = 2007E&PSL.263..104T | title=High resolution imaging in the inhomogeneous crust with cosmic-ray muon radiography: The density structure below the volcanic crater floor of Mt. Asama, Japan | journal=Earth and Planetary Science Letters | volume=263 | page=104 | year=2007 |author1=Tanaka, Hiroyuki K. M. |author2=Nakano, Toshiyuki |author3=Takahashi, Satoru |author4=Yoshida, Jyunya |author5=Takeo, Minoru |author6=Oikawa, Jun |author7=Ohminato, Takao |author8=Aoki, Yosuke |author9=Koyama, Etsuro |author10=Tsuji, Hiroshi |author11=Niwa, Kimio | issue=1–2 | doi=10.1016/j.epsl.2007.09.001}}</ref> A University of Tokyo [[vulcanology|volcano observatory]] is located on the mountain's east slope. Volcanic gas emissions from this volcano are measured by a [[Multi-Component Gas Analyzer System]], which detects pre-eruptive degassing of rising magmas, improving [[prediction of volcanic activity]].<ref>{{cite web|url=http://meetingorganizer.copernicus.org/EGU2009/EGU2009-5839.pdf|title=Real-Time Multi-GAS sensing of volcanic gas composition: experiences from the permanent Etna and Stromboli networks, Geophysical Research Abstracts, Vol. 11, EGU2009-5839}}</ref> There is also another mountain called Asama (朝熊山, ''Asama-yama'') of only 555 meters in [[Mie Prefecture]].<ref>{{cite web |last1=Bastion |first1=Arlene |title=Huffing and Puffing Up Mt Asama |url=https://en.japantravel.com/mie/huffing-and-puffing-up-mt-asama/58547 |website=Japan Travel |date=11 April 2019 |access-date=13 April 2022}}</ref>
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