Timing of large-scale ridge-moving landslides around Aigawa, Northern Nagano Prefecture, central Japan, and their tectonic implications [JE] : Mountains and slopes(GEOMORPHOLOGICAL ABSTRACTS (2001)From scientific papers published in Japan) :
{"title":"Timing of large-scale ridge-moving landslides around Aigawa, Northern Nagano Prefecture, central Japan, and their tectonic implications [JE] : Mountains and slopes(GEOMORPHOLOGICAL ABSTRACTS (2001)From scientific papers published in Japan) :","authors":"T. Ueki","doi":"10.4116/JAQUA.40.393","DOIUrl":null,"url":null,"abstract":"糸魚川-静岡構造線活断層系の北部セグメントの東に位置する長野県北部八坂村相川周辺において認められる大規模な尾根移動型地すべり地形を記載・火山灰編年し,中期更新世の断層活動との関連性について考察した.そこでは,大規模な尾根移動型地すべりの地すべり堆を構成する破砕された大峰溶結凝灰岩の凹部を,大峰溶結凝灰岩と大町Apmテフラ群(APm)のブロックが混在するローム層が埋め,その上位には立山Dテフラ(Tt-D)をはさむローム層が斜面を覆っている.このことから,APm降下以後でTt-D降下以前,すなわち約30~40万年前から12万年前の間に大規模な尾根移動型の地すべりが発生したと考えられる.このような大規模な地すべりの発生は,相川周辺の主稜線が当時比高の大きな山地になっていたことを示唆し,それは糸魚川-静岡構造線活断層系の運動によると考えられる.","PeriodicalId":35821,"journal":{"name":"Chikei","volume":"23 1","pages":"699"},"PeriodicalIF":0.0000,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chikei","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4116/JAQUA.40.393","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}