JaLCDOI 10.18926/ESR/55321
タイトル(別表記) Risk prediction of landslide and debris flow using slope gradation map obtained from airborne laser scanning
フルテキストURL esr_023_1_001_007.pdf
著者 鈴木 茂之| 宮下 征士| 平川 武| 藤原 身江子| 西山 哲|
抄録 The slope gradation map which is obtained from airborne laser scanning is very important tool to detect hazardous sites of landslide, debris flow and others. The features of the images (what the images are represented) in the map were confirmed by field survey. The study area, Tamagashi is situated in the Kibi Plateau area, Okayama City, Japan. The map helps to distinguish between artificial microrelief and natural microtopography very well. Small scarps (even 0.5m high), rocky cliffs and large blocks (larger than 2m) are identified in the map. The detail images of the microrelief suggest threatening sites. The merit of the map leads us to find the site in the field easily. We will not miss the threatening sites by using the map.
キーワード Risk prediction slope gradation map airborne laser scanning landslide debris flow Okayama
出版物タイトル Okayama University Earth Science Report
発行日 2016-12-27
23巻
1号
開始ページ 1
終了ページ 7
ISSN 1340-7414
言語 Japanese
著作権者 © 2016 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
著者 山本 悦世| 山口 雄治| 鈴木 茂之|
発行日 2018-02
資料タイプ 研究報告書
JaLCDOI 10.18926/ESR/49208
タイトル(別表記) Folded structure of the Carboniferous Ko-yama Limestone Group, Akiyoshi Belt, SW JAPAN
フルテキストURL esr_019_1_005_011.pdf
著者 稲田 徳之| 鈴木 茂之| 石田 啓祐|
抄録 The fold structure of the Akiyoshi Belt was analyzed in Kawakami-cho, Okayama Prefecture, where the Lower Carboniferous to Middle Permian Ko-yama Limestone Group (Yokoyama et al., 1979), Permian Yoshii Group (Sano et al., 1987) and Triassic Nariwa Group (Teraoka, 1959) are distributed. The Nariwa Group unconformably covers the Paleozoic successions (Otoh, 1985). The Lower Carboniferous to Middle Permian Ko-yama Limestone Group, dated by foraminifers and fusulinids (Yokoyama et al., 1979), is mainly composed of massive limestone with basic volcanics, acidic tuff and chert. The Paleozoic successions of the Akiyoshi Belt were folded during the Middle to Late Permian (Suzuki et al., 1990). Strata of the Ko-yama Limestone Group generally strike E-W and dip to the north. The Hoya section about 300 m thick is composed of limestone, basic tuff, chert and acidic tuff, limestone, basic lava and tuff in ascending order. In this section, Ishida et al. (2012) recognized a nearly complete conodont faunal succession ranging from the upper Visean to the lower Moscovian. The faunal succession indicates younging southward, and the strata are overturned. A folded strucuture of tight overfold with north-dipping axial plane was reconstructed. Similar style of small scale overfolds of banded chert and turbidite were observed in the overlying Yoshii Group.
キーワード folded structure Ko-yama Limestone Group Carboniferous Akiyoshi Belt
出版物タイトル Okayama University Earth Science Report
発行日 2012-12-26
19巻
1号
開始ページ 5
終了ページ 11
ISSN 1340-7414
言語 Japanese
著作権者 © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005232326
JaLCDOI 10.18926/ESR/56691
タイトル(別表記) Non-calcareous beachrock found in Akagurisaki, Ohi Town, Fukui Prefecture
フルテキストURL esr_025_001_005.pdf
著者 鈴木 茂之| 東 洋一| 出山 康代| 湯川 弘一| 臼井 まゆみ|
抄録 Beachrock which was formed about 0.5 meter higher than high tide is found in Akagurisaki, Ohi Town, Fukui Prefecture. The outcrops always get wet by spring water. The sediments are composed of well sorted rounded gravels and sands but calcareous shell is not found at all. Intergranular space is occupied by white amorphous cement. Magnesium and silicon rich composition of the cement is obtained by EPMA analysis. There is a conjecture that the magnesium rich cement was precipitated in spite of solution of calcareous shell under saturated state by spring water, because calcium has a higher tendency to ionize than magnesium.
キーワード Beachrock Akagurisaki non-calcareous cement ionization tendency
出版物タイトル Okayama University Earth Science Report
発行日 2018-12-27
25巻
1号
開始ページ 1
終了ページ 5
ISSN 1340-7414
言語 Japanese
著作権者 © 2018 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
JaLCDOI 10.18926/ESR/15024
タイトル(別表記) Microscopic observations of the recent soils: a step for understanding the paleosols
フルテキストURL 015_009_032.pdf
著者 福地 亮| 鈴木 茂之|
抄録 The microscopic observations of the recent soil horizons were conducted in Okayama, Japan (moderate climate). The several soil horizons, including two surface (epipedon) and three subsurface horizons, were recognized in the forest, poorly vegetated hill, and riverside around the Okayama University. The umbric epipedon can be segregated from the organic-rich subsurface horizons by the scattered organic materials in thin sections. The ochrich epipedon shows the sandy matrix without any cements and the illuviation of clay minerals. The subsurface horizons identified in the study area are as follows: albic, argillic, and cambic horizons. Each subsurface horizon shows the specific structures in thin sections. The albic horizon is characterized by the absence of the illuviation. The argillic horizon definitely shows the clayey matrix and the illuviation of clay minerals. The primary structures may be retained in the cambic horizon. The microscopic examination of the Miocene paleosols from the Ukan-cho, Okayama, was attempted. By comparing the recent soils, the cambic horizon and spodic horizon, which is characterized by the concentration of sesquioxides, are identified in the paleosols. This attempt suggests that the microscopic observations of the recent soils is a useful guide to understanding the paleosols
キーワード soil paleosol soil horizon soil structure microscopic observation
出版物タイトル Okayama University Earth Science Report
発行日 2009-03-31
15巻
1号
開始ページ 9
終了ページ 32
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002307964
著者 鈴木 茂之| 行基 幸一|
発行日 1999-09-20
出版物タイトル Okayama University Earth Science Report
6巻
1号
資料タイプ 紀要論文
著者 鈴木 茂之|
発行日 2014-02
出版物タイトル 環境制御
35巻
資料タイプ 紀要論文
JaLCDOI 10.18926/ESR/13875
タイトル(別表記) Depositional environments of the Katsuta Group, eastern Tsuyama Basin, Southwest Japan
フルテキストURL earth_science_reports_010_1_23.pdf
著者 山崎 良| 鈴木 茂之|
抄録 The Miocene Katauta Group of the Syohoku-cho area is subdivides into 6 members ; The Uetsuki Conglomerate Member, Nara Sandy Mudstone Member, Tai Gravelly Sandstone Member, Takatori Conglomerate Member, Ayabe Mudstone Member and Maruyama Mutstone Member from bottom to top. The unconformity between Miocene deposits and basement rocks in this area was traced to obtain geometry of the Miocene basin. Contour maps of the bases of the Miocene Yoshino Formation and Takakura Formation indicate paleo-topography. The obtained topography demonstrates a valley, which flowed to north-west, and a few islands and bays. It indicates that these Miocene successuions were deposited in the topography which resemble to the present Seto Inland.
キーワード Katsuta Group Tsuyama Basin Miocene geometry of basin paleoenvironmental chage
出版物タイトル Okayama University Earth Science Report
発行日 2003-12-20
10巻
1号
開始ページ 23
終了ページ 31
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310475
著者 鈴木 茂之| 稲田 孝司|
発行日 1995-09-20
出版物タイトル Okayama University Earth Science Report
2巻
1号
資料タイプ 紀要論文
著者 鈴木 茂之| 宮脇 明子|
発行日 1998-09-20
出版物タイトル Okayama University Earth Science Report
5巻
1号
資料タイプ 紀要論文
著者 藤原 貴生| 田口 栄次| 鈴木 茂之|
発行日 2001-09-20
出版物タイトル Okayama University Earth Science Report
8巻
1号
資料タイプ 紀要論文
JaLCDOI 10.18926/ESR/19848
タイトル(別表記) The first Japanese word "chishitsu-gaku" for the "geology" was proposed by Genpo Mitsukuri (1799-1863)
フルテキストURL 016_001_007.pdf
著者 岡田 博有| 鈴木 茂之|
抄録 The first Japanese word "chishitsu-gaku" for the "geology" was proposed by Genpo Mitsukuri, a scientific contributor in the Tokugawa regime in the 19th century, who was born in 1799 in Tsuyama in Western Honshu, Japan and had worked for scientific activities of the Tokugawa government from 1839 to 1863. His major works for the first making of the "chishitsu-gaku" for the "geology" have been presented in this paper, also showing his contribution to Japanese sciences.
キーワード Genpo Mitsukuri "chishitsu-gaku" 19th century
出版物タイトル Okayama University Earth Science Report
発行日 2009-12-25
16巻
1号
開始ページ 1
終了ページ 7
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002309076
JaLCDOI 10.18926/ESR/53193
タイトル(別表記) Paleoparadoxia from the middle Miocene of Obara, Misaki-cho, Okayama Prefecture, Japan
フルテキストURL esr_021_1_007_011.pdf
著者 福地 亮| 鈴木 茂之|
抄録  The partially preserved left humerus of the Desmostylia (Mammalia) has been collected from the riverbed in Obara, Misaki-cho, Okayama Prefecture in the western Japan. This specimen can be classified to the genus Paleoparadoxia by the following features: the absence of the supratrochlear foramen; the curved disto-lateral border of the shaft in the antero-posterior view; the medio-laterally expanded flat trochlea of humerus. Moreover, this specimen can be referred to cf. P. media on the basis of its middle-sized dimensions. This is the second occurrence of Palaeoparadoxia from Okayama Prefecture.
キーワード Middle Miocene mammal Desmostylia Paleoparadoxia
出版物タイトル Okayama University Earth Science Report
発行日 2014-12-27
21巻
1号
開始ページ 7
終了ページ 11
ISSN 1340-7414
言語 Japanese
著作権者 © 2014 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005567872
JaLCDOI 10.18926/ESR/13870
タイトル(別表記) Paleoenvironmental Analyses of the Buried Peat Deposit during the mid-Holocene at the Desaki Coast in Tamano City, Okayama Prefecture, Weatern Japan
フルテキストURL earth_science_reports_011_1_39.pdf
著者 松下 まり子| 佐藤 裕司| 鈴木 茂之| 行基 幸一| 百原 新| 植田 弥生| 加藤 茂弘| 前田 保夫|
抄録 The buried peat deposit was foud in the sand beach on the Desaki coast (Tamano City, Okayama Prefecture), the northeastern coast of Seto Inland Sea. In this study, we performed sulfur and diatom analyses of the deposit. The results were used along with 14C dates and the eruption age (7300 cal BP) of Kikai-Akahoya tephra (K-Ab) to derive sedimentary environments of the deposit. K-Ah was detected just below the peat deposit. At the culmination of the Jomon transgression, the peat deposit had been formed in brackish environments of salt marsh for about 300 years. In order to reconstruct local paleovegetation, we analyzed pollen, wood and plant fossils in the deposit. The results show vegetational transition from a deciduous broadleaved forest mainly of Ouercus subgen. Lepidobalanus to Pinus forest. In spite of the Holocene thermal optimum, the vegetation dominated by Ouercus subgen. Cyclobanopsis was not recognized at the Desaki site, as has been shown in many other regions of regions of western Japan. Ouercus sect. Prinus was replaced by Ouercus sect. Aegilops as the dominant section of Ouercus subgen. Lepidobalanus, suggesting early establishment of traditional rural vegetation of 'Satoyama' in Japan. However, no evidence for human agency has been obtained from the mid-Holocene archaeological sites around the Desaki site. Thus it is more likely that this vegetational transition resulted from the succession caused by natural forces such as ecological disturbance and climatic and/or endemic situations rather than by cultural deforestation.
キーワード Desaki coast diatom remains Jomon transgression Kikai-Akahoya tephra mid-Holocene Paleoenvironment peat deposit plant fossils
出版物タイトル Okayama University Earth Science Report
発行日 2004-12-31
11巻
1号
開始ページ 39
終了ページ 47
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310603
JaLCDOI 10.18926/ESR/52165
タイトル(別表記) On Periploma mitsuganoense Araki (Bivalvia: Mollusca) from the Miocene Bihoku Group in Niimi City, Okayama Prefecture, southwest Japan ―with special reference to it’s paleogeographic significance―
フルテキストURL esr_020_1_007_011.pdf
著者 田口 栄次| 岸本 眞五| 鈴木 茂之|
抄録 In this paper, we deal with re-description of Periploma mitsuganoense Araki and it’s morphological variation and significance of the molluscan fauna of it from the Miocene Bihoku Group in Niimi City, Okayama Prefecture, Southwest Japan. Moreover, the paleogeographic significance of this species is analyzed. The obtained results are summarized as follows: 1. The morphological variation of Periploma mitsuganoense Araki has a wide range on the basis of the analysis of the morphological outline. 2. The occurrence of P. mitsuganoense Araki from the Pectinid fauna is the first record in the West Setouchi Geological Province. 3. It is presumable that P. mitsuganoense Araki is an endemic species in the First Setouchi Geological Province from a view point of it’s spatial distribution.
キーワード Periploma mitsuganoense Araki Mollusca Miocene Bihoku Group morphological variation paleogeographic significance
出版物タイトル Okayama University Earth Science Report
発行日 2013-12-27
20巻
1号
開始ページ 7
終了ページ 11
ISSN 1340-7414
言語 Japanese
著作権者 © 2013 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005394593
JaLCDOI 10.18926/ESR/54119
タイトル(別表記) Facies analysis of the Jito Formation ( Upper Triassic Nariwa Group ) in Jito Area, Kawakami, Okayama Pref., SWJapan.
フルテキストURL esr_022_1_031_039.pdf
著者 正岡 祐人| 鈴木 茂之|
抄録 Facies analysis and analysis of stratigraphy together with folded structure of the Norian Jito Formation were studied in Jito Area, Kawakami, Okayama Pref., SW Japan. Results of regional mapping and measured sections reconstruct three-dimensionally distribution of the Jito Formation. The Jito Formation is sub-divided into the four new members; the Shimohira Muddy Sandstone Member, the Otofuji Coarse-grained Turbidite Member, the Misawa Fine-grained Turbidaite Member, and the Ide Conglomerate Sandstone Member in ascending order. The shimohira Muddy Sandstone Member is interpreted to be deposited in an inner-bay. The Otofuji Coarse-grained Turbidite Member and The Misawa Fine-grained Turbidite Member are considered to be deposited on a continental shelf. The Ide Conglomerate Sandstone Member is inferred to be a shallow marine deposit. As a result, the Jito Formation is regarded as one transgressive-regressive package.
キーワード Jito Formation Nariwa Group Norian facies analysis turbidite
出版物タイトル Okayama University Earth Science Report
発行日 2015-12-27
22巻
1号
開始ページ 31
終了ページ 39
ISSN 1340-7414
言語 Japanese
著作権者 © 2015 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005728631
JaLCDOI 10.18926/ESR/52164
タイトル(別表記) Debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture
フルテキストURL esr_020_1_001_006.pdf
著者 木村 裕貴| 鈴木 茂之|
抄録 The debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture caused by the hard rain of Typhoon 12 of September, 2011. Furthermore, 11 small landslides occurred in the study area. In this area, the altitude of mountainous are not so high (150m to 250m) and the amount of precipitation which producted the debris avalanche was not very serious quantity with 230mm. However the debris avalanche occurred. One private house collapsed, and the first floor part of the Kitamura Elementary School was buried due to the debris flow. The purpose of this study is to examine causes of the debris avalanche disaster occurred in Kitamura area using applied geological technique. The length of the debris avalanche scar is about 250m, and alluvial fan is formed as a debris slope. The ground is composed of weathered granite and the bottom of the valley was filled by soils derived from disintegrated granite. There are three small landslides as head scarps with steep slopes at approximately 30°-35°. The debris avalanche was inferred to have started as a shallow soil slip at the head by rainfall. 3 major causes are inferred which originated the debris avalanche in the study area; steep slope, ground composed of weathered granite, existence of sandy soil which occupied at the bottom of valley.
キーワード debris avalanche steep slope weathered granite
出版物タイトル Okayama University Earth Science Report
発行日 2013-12-27
20巻
1号
開始ページ 1
終了ページ 6
ISSN 1340-7414
言語 Japanese
著作権者 © 2013 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005394592
著者 藤原 貴生| 鈴木 茂之| 前田 保夫|
発行日 2000-09-20
出版物タイトル Okayama University Earth Science Report
7巻
1号
資料タイプ 紀要論文
JaLCDOI 10.18926/ESR/49207
タイトル(別表記) Holocene environmental and sea-level changes of the Okayama Plain – evidence from peat beds –
フルテキストURL esr_019_1_001_004.pdf
著者 鈴木 茂之|
抄録 Quaternary peat beds from bore-hole samples deliver information to reconstruct paleoenvironment. Altitudes of dated non-marine peat beds and marine beds allow to be created a sea-level curve. 4 peat beds (A to D) are identified from the uppermost Pleistocene to Holocene deposits of the Okayama Plain. They thought to be deposited at stable events during sea-level change.
キーワード Holocene peat beds paleoenvironment sea-level change Okayama Plain
出版物タイトル Okayama University Earth Science Report
発行日 2012-12-26
19巻
1号
開始ページ 1
終了ページ 4
ISSN 1340-7414
言語 Japanese
著作権者 © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005232325
JaLCDOI 10.18926/ESR/13869
タイトル(別表記) Relative sea-level changes of the Okayama Plain Area during the Holocene, Southwest Japan
フルテキストURL earth_science_reports_011_1_33.pdf
著者 鈴木 茂之|
抄録 Postglacial relative sea-level change of the Okayama Plain Area has been analyzed. Former sea-levels were recognized by using peat beds and marine organisms which are also available for 14C dating. Peat beds were rhought to be formed under a stable sea-level condition. 14C ages of the analyzed peat beds were seprated by 4 groups ; 30~18 ka BP, 11~8 ka BP, 6~4 ka BP and 3~2.5 ka BP, indicate 4 stable sea-level periods. 2 transgressive events (18~11 ka BP and 8~6 ka BP) and one regressive event (3.5?~3 ka BP) were also inferred.
キーワード sea-level change peat bed Holocene Okayama Plain
出版物タイトル Okayama University Earth Science Report
発行日 2004-12-31
11巻
1号
開始ページ 33
終了ページ 37
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310268