JaLCDOI 10.18926/ESR/55321
Title Alternative Risk prediction of landslide and debris flow using slope gradation map obtained from airborne laser scanning
FullText URL esr_023_1_001_007.pdf
Author Suzuki, Shigeyuki| Miyashita, Masashi| Hirakawa, Takeshi| Fujiwara, Mieko| Nishiyama, Satoshi|
Abstract 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.
Keywords Risk prediction slope gradation map airborne laser scanning landslide debris flow Okayama
Publication Title Okayama University Earth Science Report
Published Date 2016-12-27
Volume volume23
Issue issue1
Start Page 1
End Page 7
ISSN 1340-7414
language 日本語
Copyright Holders © 2016 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
Author Yamamoto, Etsuyo| Yamaguchi, Yuji| Suzuki, Shigeyuki|
Published Date 2018-02
Content Type Research Paper
JaLCDOI 10.18926/ESR/49208
Title Alternative Folded structure of the Carboniferous Ko-yama Limestone Group, Akiyoshi Belt, SW JAPAN
FullText URL esr_019_1_005_011.pdf
Author Inada, Noriyuki| Suzuki, Shigeyuki| Ishida, Keisuke|
Abstract 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.
Keywords folded structure Ko-yama Limestone Group Carboniferous Akiyoshi Belt
Publication Title Okayama University Earth Science Report
Published Date 2012-12-26
Volume volume19
Issue issue1
Start Page 5
End Page 11
ISSN 1340-7414
language 日本語
Copyright Holders © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
NAID 120005232326
JaLCDOI 10.18926/ESR/56691
Title Alternative Non-calcareous beachrock found in Akagurisaki, Ohi Town, Fukui Prefecture
FullText URL esr_025_001_005.pdf
Author Suzuki, Shigeyuki| Azuma, Yoichi| Deyama, Yasuyo| Yukawa, Hirokazu| Usui, Mayumi|
Abstract 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.
Keywords Beachrock Akagurisaki non-calcareous cement ionization tendency
Publication Title Okayama University Earth Science Report
Published Date 2018-12-27
Volume volume25
Issue issue1
Start Page 1
End Page 5
ISSN 1340-7414
language 日本語
Copyright Holders © 2018 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
JaLCDOI 10.18926/ESR/15024
Title Alternative Microscopic observations of the recent soils: a step for understanding the paleosols
FullText URL 015_009_032.pdf
Author 福地 亮| Suzuki, Shigeyuki|
Abstract 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
Keywords soil paleosol soil horizon soil structure microscopic observation
Publication Title Okayama University Earth Science Report
Published Date 2009-03-31
Volume volume15
Issue issue1
Start Page 9
End Page 32
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002307964
Author Suzuki, Shigeyuki| Yukimoto, Koichi|
Published Date 1999-09-20
Publication Title Okayama University Earth Science Report
Volume volume6
Issue issue1
Content Type Departmental Bulletin Paper
Author 鈴木 茂之|
Published Date 2014-02
Publication Title 環境制御
Volume volume35
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/ESR/13875
Title Alternative Depositional environments of the Katsuta Group, eastern Tsuyama Basin, Southwest Japan
FullText URL earth_science_reports_010_1_23.pdf
Author Yamasaki, Ryo| Suzuki, Shigeyuki|
Abstract 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.
Keywords Katsuta Group Tsuyama Basin Miocene geometry of basin paleoenvironmental chage
Publication Title Okayama University Earth Science Report
Published Date 2003-12-20
Volume volume10
Issue issue1
Start Page 23
End Page 31
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310475
Author Suzuki, Shigeyuki| Inada, Takashi|
Published Date 1995-09-20
Publication Title Okayama University Earth Science Report
Volume volume2
Issue issue1
Content Type Departmental Bulletin Paper
Author Suzuki, Shigeyuki| Miyawaki, Akiko|
Published Date 1998-09-20
Publication Title Okayama University Earth Science Report
Volume volume5
Issue issue1
Content Type Departmental Bulletin Paper
Author Fujiwara, Takao| Taguchi, Eiji| Suzuki, shigeyuki|
Published Date 2001-09-20
Publication Title Okayama University Earth Science Report
Volume volume8
Issue issue1
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/ESR/19848
Title Alternative The first Japanese word "chishitsu-gaku" for the "geology" was proposed by Genpo Mitsukuri (1799-1863)
FullText URL 016_001_007.pdf
Author Okada, Hakuyu| Suzuki, Shigeyuki|
Abstract 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.
Keywords Genpo Mitsukuri "chishitsu-gaku" 19th century
Publication Title Okayama University Earth Science Report
Published Date 2009-12-25
Volume volume16
Issue issue1
Start Page 1
End Page 7
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002309076
JaLCDOI 10.18926/ESR/53193
Title Alternative Paleoparadoxia from the middle Miocene of Obara, Misaki-cho, Okayama Prefecture, Japan
FullText URL esr_021_1_007_011.pdf
Author Fukuchi, Akira| Suzuki, Shigeyuki|
Abstract  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.
Keywords Middle Miocene mammal Desmostylia Paleoparadoxia
Publication Title Okayama University Earth Science Report
Published Date 2014-12-27
Volume volume21
Issue issue1
Start Page 7
End Page 11
ISSN 1340-7414
language 日本語
Copyright Holders © 2014 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
NAID 120005567872
JaLCDOI 10.18926/ESR/13870
Title Alternative Paleoenvironmental Analyses of the Buried Peat Deposit during the mid-Holocene at the Desaki Coast in Tamano City, Okayama Prefecture, Weatern Japan
FullText URL earth_science_reports_011_1_39.pdf
Author Matsushita, Mariko| Sato, Hiroshi| Suzuki, Shigeyuki| Yukumoto, Koichi| Momohara, Arata| Ueda, Yayoi| Katoh, Shigehiro| Maeda, Yasuo|
Abstract 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.
Keywords Desaki coast diatom remains Jomon transgression Kikai-Akahoya tephra mid-Holocene Paleoenvironment peat deposit plant fossils
Publication Title Okayama University Earth Science Report
Published Date 2004-12-31
Volume volume11
Issue issue1
Start Page 39
End Page 47
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310603
JaLCDOI 10.18926/ESR/52165
Title Alternative 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―
FullText URL esr_020_1_007_011.pdf
Author Taguchci, Eiji| Kishimoto, Shingo| Suzuki, Shigeyuki|
Abstract 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.
Keywords Periploma mitsuganoense Araki Mollusca Miocene Bihoku Group morphological variation paleogeographic significance
Publication Title Okayama University Earth Science Report
Published Date 2013-12-27
Volume volume20
Issue issue1
Start Page 7
End Page 11
ISSN 1340-7414
language 日本語
Copyright Holders © 2013 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
NAID 120005394593
JaLCDOI 10.18926/ESR/54119
Title Alternative Facies analysis of the Jito Formation ( Upper Triassic Nariwa Group ) in Jito Area, Kawakami, Okayama Pref., SWJapan.
FullText URL esr_022_1_031_039.pdf
Author Masaoka, Yuto| Suzuki, Shigeyuki|
Abstract 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.
Keywords Jito Formation Nariwa Group Norian facies analysis turbidite
Publication Title Okayama University Earth Science Report
Published Date 2015-12-27
Volume volume22
Issue issue1
Start Page 31
End Page 39
ISSN 1340-7414
language 日本語
Copyright Holders © 2015 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
NAID 120005728631
JaLCDOI 10.18926/ESR/52164
Title Alternative Debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture
FullText URL esr_020_1_001_006.pdf
Author Kimura, Yuki| Suzuki, Shigeyuki|
Abstract 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.
Keywords debris avalanche steep slope weathered granite
Publication Title Okayama University Earth Science Report
Published Date 2013-12-27
Volume volume20
Issue issue1
Start Page 1
End Page 6
ISSN 1340-7414
language 日本語
Copyright Holders © 2013 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
NAID 120005394592
Author Fujiwara, Takao| Suzuki, Shigeyuki| Maeda, Yasuo|
Published Date 2000-09-20
Publication Title Okayama University Earth Science Report
Volume volume7
Issue issue1
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/ESR/49207
Title Alternative Holocene environmental and sea-level changes of the Okayama Plain – evidence from peat beds –
FullText URL esr_019_1_001_004.pdf
Author Suzuki, Shigeyuki|
Abstract 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.
Keywords Holocene peat beds paleoenvironment sea-level change Okayama Plain
Publication Title Okayama University Earth Science Report
Published Date 2012-12-26
Volume volume19
Issue issue1
Start Page 1
End Page 4
ISSN 1340-7414
language 日本語
Copyright Holders © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
NAID 120005232325
JaLCDOI 10.18926/ESR/13869
Title Alternative Relative sea-level changes of the Okayama Plain Area during the Holocene, Southwest Japan
FullText URL earth_science_reports_011_1_33.pdf
Author Suzuki, Shigeyuki|
Abstract 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.
Keywords sea-level change peat bed Holocene Okayama Plain
Publication Title Okayama University Earth Science Report
Published Date 2004-12-31
Volume volume11
Issue issue1
Start Page 33
End Page 37
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310268