{"title":"The Paper for the 2011 Japan Association for Quaternary Research Academic Award Research results of earthquake-archaeology","authors":"A. Sangawa","doi":"10.4116/JAQUA.52.191","DOIUrl":"https://doi.org/10.4116/JAQUA.52.191","url":null,"abstract":"","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134298386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A personal review of Quaternary studies","authors":"Y. Naruse","doi":"10.4116/jaqua.51.165","DOIUrl":"https://doi.org/10.4116/jaqua.51.165","url":null,"abstract":"","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123820848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Small laboratory experiments suitable for improving the eye for seeing landscapes","authors":"Hiroshi Ikeda","doi":"10.4116/jaqua.50.209","DOIUrl":"https://doi.org/10.4116/jaqua.50.209","url":null,"abstract":"日本は様々な地形変化が活発に起こる場所であるが，地形に関する教育が十分に行われているとはいえない．本論では，地形を見る目を磨くためには，野外での調査・観察に加えて，小型水路実験がきわめて有用であることを紹介する．非定常条件下の三次元実験によって，地形の成り立ち，生い立ちを見る歴史の目と地理の目を磨くことが可能である．実験材料とモデルの大きさ・外力とを適宜組み合わせて，実際の地形現象と類似の地形を生じさせる小型実験がうまくいくと，実験で起こる現象と実際の地形をうまく結びつけることができるようになる．すなわち，実際の地形の変化過程が見えるようになり，地形を静止画ではなく，その過程をムービー（動画）としてイメージできるようになる．","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114969748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Tsunami deposit from the 7,300 cal BP Akahoya eruption preserved in the Yokoo midden, north Kyushu, West Japan","authors":"O. Fujiwara, H. Machida, Shiochi Jun-ichi","doi":"10.4116/JAQUA.49.23","DOIUrl":"https://doi.org/10.4116/JAQUA.49.23","url":null,"abstract":"大分市の横尾貝塚で見られる厚い鬼界アカホヤ火山灰層（K-Ah : 層厚約65 cm）について，堆積構造の解析などに基づいて形成プロセスを復元した．この火山灰層をもたらした噴火は，横尾貝塚から約300 km南にある鬼界カルデラで約7,300 cal BPに発生した．これは完新世における地球上で最大規模の噴火イベントの一つである．横尾貝塚のK-Ahは湾奥にあった小規模な谷に堆積したもので，さまざまな堆積構造が発達するイベント堆積物（ユニットI～V : 層厚約35 cm）と，それを覆う均質なユニットVI（層厚約30 cm）からなる．イベント堆積物はK-Ahの降灰中に谷に突入した流水によって堆積し，ユニットI～Vの累積構造からは，谷を遡上する流れと下る流れが長周期で繰り返したことが読み取れる．ユニットVIは降下火山灰と考えられる．K-Ah降下との同時性や，長周期で遡上と流下を繰り返す特徴は，K-Ah下部を構成するイベント堆積物がアカホヤ噴火に伴う津波堆積物であることを強く示唆する．","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124724146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Ota, Akiko Matsubara, Y. Matsushima, K. Kashima, Atsuko Kanauchi, Yasuhiro Suzuki, Mitsuhisa Watanabe, H. Sawa, T. Azuma
{"title":"Holocene paleoenvironmental changes at coastal Kuninaka Plain, Sado Island, off central Japan, as deduced from analysis of drilling data","authors":"Y. Ota, Akiko Matsubara, Y. Matsushima, K. Kashima, Atsuko Kanauchi, Yasuhiro Suzuki, Mitsuhisa Watanabe, H. Sawa, T. Azuma","doi":"10.4116/JAQUA.47.143","DOIUrl":"https://doi.org/10.4116/JAQUA.47.143","url":null,"abstract":"","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132421314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Paleoclimate of interglacial Marine Isotope Stage 11 (MIS 11), about 400 ky ago was estimated using data from shallow-marine to terrestrial strata of the Japanese Islands. The reason of the estimation comes from that the paleoclimate gives analogs for the future climate, because the conditions of Milankovitch forcing of MIS 11 are similar to those of modern Holocene. The results show the MIS 11 of the Japanese Islands was warmer, with a longer interval of highstand, and higher sea levels than the other interglacials. Further investigation for the strata of MIS 11 of the Japanese Island is needed and will give us important information about our future climate.
{"title":"Paleoclimate of Interglacial Marine Isotope Stage 11 (MIS 11) from Strata in the Japanese Isalands","authors":"F. Masuda","doi":"10.4116/jaqua.46.235","DOIUrl":"https://doi.org/10.4116/jaqua.46.235","url":null,"abstract":"Paleoclimate of interglacial Marine Isotope Stage 11 (MIS 11), about 400 ky ago was estimated using data from shallow-marine to terrestrial strata of the Japanese Islands. The reason of the estimation comes from that the paleoclimate gives analogs for the future climate, because the conditions of Milankovitch forcing of MIS 11 are similar to those of modern Holocene. The results show the MIS 11 of the Japanese Islands was warmer, with a longer interval of highstand, and higher sea levels than the other interglacials. Further investigation for the strata of MIS 11 of the Japanese Island is needed and will give us important information about our future climate.","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121491037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The recent history of brackish Lake Obuchi-numa, Aomori Prefecture, Japan, was investigated, in order to examine the ecological and geochemical response to annual sea-level variations. The core sediment was calibrated by 210Pb and 137Cs radioactivity measurement and the calculated sedimentation rate was 0.075 g/cm2/yr during the 20th century. A foraminiferal assemblage composed exclusively of Ammonia “beccarii ” developed in 1954 and in the 1960s to early 1970s, but it was largely absent before the 1950s and after the 1980s. The occurrences of A. “beccarii ” are mostly in concert with the sea-level rise recorded off Hachinohe, suggesting the active exchange of lagoon and marine water. Geochemical evidence such as chlorine and sulfur supports the influence of marine water when sea-level rose. Total organic carbon to total nitrogen ratios (C/N ratios) decreased in the periods when foraminifera were abundant, and the ratios positively suggest increased supply of N-rich proteins to the sediment. However, there was no clear response of A. “beccarii ” to the sea-level rise that continued after 1990 to the present. The decreased A. “beccarii ” assemblages were probably a result of significant human activities from the 1980s onwards.
{"title":"Environmental Changes in Brackish Lake Obuchi-numa, Aomori Prefecture, Northeast Honshu, Japan, with Special Reference to Sea-level Variation in the 20th Century","authors":"R. Nomura, N. Nemoto, K. Komura","doi":"10.4116/JAQUA.45.347","DOIUrl":"https://doi.org/10.4116/JAQUA.45.347","url":null,"abstract":"The recent history of brackish Lake Obuchi-numa, Aomori Prefecture, Japan, was investigated, in order to examine the ecological and geochemical response to annual sea-level variations. The core sediment was calibrated by 210Pb and 137Cs radioactivity measurement and the calculated sedimentation rate was 0.075 g/cm2/yr during the 20th century. A foraminiferal assemblage composed exclusively of Ammonia “beccarii ” developed in 1954 and in the 1960s to early 1970s, but it was largely absent before the 1950s and after the 1980s. The occurrences of A. “beccarii ” are mostly in concert with the sea-level rise recorded off Hachinohe, suggesting the active exchange of lagoon and marine water. Geochemical evidence such as chlorine and sulfur supports the influence of marine water when sea-level rose. Total organic carbon to total nitrogen ratios (C/N ratios) decreased in the periods when foraminifera were abundant, and the ratios positively suggest increased supply of N-rich proteins to the sediment. However, there was no clear response of A. “beccarii ” to the sea-level rise that continued after 1990 to the present. The decreased A. “beccarii ” assemblages were probably a result of significant human activities from the 1980s onwards.","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121563640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Miyauchi, T. Minawa, T. Ito, H. Kato, T. Kawamura, T. Ikawa, Kazumi Asao
A graben is defined geologically as a topographic depression generated by dip-slip faulting. The Kamogawa Graben on the southern Boso Peninsula, central Japan, is considered to be a typical graben, although it has yet to be geomorphologically or geologically verified. In this study we use seismic reflection profiling and analyses of geomorphic and geologic data to reexamine the unsolved question of whether this structure is in fact a graben. We present an interpretation of the structure in terms of its structurally controlled geomorphic evolution. On the basis of our analysis, we conclude that the so-called Kamogawa Graben is not actually a graben, as graben structures are not observed in seismic images and there is no positive cumulative deformation recorded by active faults at the surface. The topographic lineaments that bound the depression between the Kazusa Hills and the Awa Hills constitute fault-line valleys and obsequent fault-line scarps. The northern lineament has developed along the geologic contact between fractured shale of the Hota Group and mudstone and sandstone of the Miura Group, while the southern lineament has developed between mudstone and sandstone formations within the Hota Group, along the Sorogawa Fault. These observations suggest that differential erosion of shale, mudstone, and sandstone strata produced the observed graben-like relief. Weathered shale is especially susceptible to erosion and is marked by areas of relatively low relief. The presence of paleo-river channels and obsequent fault-line scarps leads us to the proposal that an earlier river system developed on the pre-erosion mountainous topography that overlaid the present Mineoka Mountains. Such a geomorphic evolution of the southern Boso Peninsula is therefore structurally controlled, and the Kamogawa Graben is in fact a structural depression rather than a graben.
{"title":"Structurally Controlled Geomorphology on the Southern Boso Peninsula, Central Japan","authors":"T. Miyauchi, T. Minawa, T. Ito, H. Kato, T. Kawamura, T. Ikawa, Kazumi Asao","doi":"10.4116/JAQUA.45.263","DOIUrl":"https://doi.org/10.4116/JAQUA.45.263","url":null,"abstract":"A graben is defined geologically as a topographic depression generated by dip-slip faulting. The Kamogawa Graben on the southern Boso Peninsula, central Japan, is considered to be a typical graben, although it has yet to be geomorphologically or geologically verified. In this study we use seismic reflection profiling and analyses of geomorphic and geologic data to reexamine the unsolved question of whether this structure is in fact a graben. We present an interpretation of the structure in terms of its structurally controlled geomorphic evolution. On the basis of our analysis, we conclude that the so-called Kamogawa Graben is not actually a graben, as graben structures are not observed in seismic images and there is no positive cumulative deformation recorded by active faults at the surface. The topographic lineaments that bound the depression between the Kazusa Hills and the Awa Hills constitute fault-line valleys and obsequent fault-line scarps. The northern lineament has developed along the geologic contact between fractured shale of the Hota Group and mudstone and sandstone of the Miura Group, while the southern lineament has developed between mudstone and sandstone formations within the Hota Group, along the Sorogawa Fault. These observations suggest that differential erosion of shale, mudstone, and sandstone strata produced the observed graben-like relief. Weathered shale is especially susceptible to erosion and is marked by areas of relatively low relief. The presence of paleo-river channels and obsequent fault-line scarps leads us to the proposal that an earlier river system developed on the pre-erosion mountainous topography that overlaid the present Mineoka Mountains. Such a geomorphic evolution of the southern Boso Peninsula is therefore structurally controlled, and the Kamogawa Graben is in fact a structural depression rather than a graben.","PeriodicalId":106287,"journal":{"name":"The Quaternary Research (daiyonki-kenkyu)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130322966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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