| 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 |
| 巻 | 20巻 |
| 号 | 1号 |
| 開始ページ | 7 |
| 終了ページ | 11 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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/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 |
| 巻 | 20巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 6 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2013-12-27 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 20巻 |
| 号 | 1号 |
| 資料タイプ | その他 |
| 著者 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2013-12-27 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 20巻 |
| 号 | 1号 |
| 資料タイプ | その他 |
| 著者 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2012-12-26 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 19巻 |
| 号 | 1号 |
| 資料タイプ | その他 |
| 著者 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2012-12-26 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 19巻 |
| 号 | 1号 |
| 資料タイプ | その他 |
| JaLCDOI | 10.18926/ESR/49212 |
|---|---|
| タイトル（別表記） | A case study on persistent appearance of the ensemble of precipitation bands in the warm sector of the Baiu front in the western Japan around 19 June 2001 |
| フルテキストURL | esr_019_1_039_050.pdf |
| 著者 | 合田 泰弘| 加藤 内藏進| 塚本 修| |
| 抄録 | A case study on persistent appearance of the ensemble of precipitation bands in the warm sector of the Baiu front in Kyushu District, the western part of Japan around 19 June 2001 was performed based on the operational observational data. Around 00UTC (09JST) 19 June when the Baiu front on the surface weather map was still located about a few 100kms to the north of Kyushu, the number and the total area of the meso-β or γ-scale line-shaped precipitation bands increased around Kyushu rapidly. These precipitation bands had been sustained there and gradually gathered each other to change into the Baiu frontal precipitation zone extending from the northern Kyushu to Seto-Naikai (Seto Inland Sea) around 09UTC (18JST) 19 June (the intense rainfall zone was still located in the warm sector of the Baiu front). Until ~09UTC (18JST) 19 June, the moist air flow with the latently unstable stratification had been sustained around Kyushu corresponding to the low-level southerly wind toward the surface Baiu front to the north of Kyushu. This large-scale situation would contribute greatly to the maintenance of the ensemble of the line-shaped precipitation bands in the warm sector of the Baiu front. |
| キーワード | ensemble of line-shaped precipitation bands precipitation in the warm sector of the Baiu front Baiu fronal rainfall |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2012-12-26 |
| 巻 | 19巻 |
| 号 | 1号 |
| 開始ページ | 39 |
| 終了ページ | 50 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120005232330 |
| JaLCDOI | 10.18926/ESR/49211 |
|---|---|
| タイトル（別表記） | The oldest fossil forest in Japan discovered from the Upper Triassic Nariwa Group, Okayama Prefecture, SW Japan -Implication for reconstruction of depositional environment and paleovegetation- |
| フルテキストURL | esr_019_1_025_037.pdf |
| 著者 | 湯川 弘一| 寺田 和雄| 孫 革| 鈴木 茂之| |
| 抄録 | Erect fossil stumps were found from the outcrop of the Upper Triassic Hinabata Formation, the uppermost part of the Nariwa Group at Hinabata, Nariwa-cho,Takahashi City, Okayama Prefecture, SW Japan. They are evidence of the oldest fossil forest in Japan. The Upper Triassic Nariwa Group is mostly composed of non-marine deposits except the marine Jito Formation and characterized by the abundance in plant fossils. The marine Jito Formation is characterized by occurrence of Norian Monotis ochotica. On the basis of detailed observation of the occurrence of erect fossil stumps, as well as sedimentary facies of fossil-bearing unit, the fossil forest was interpreted to have grown on the top of the natural-levee units. One of the erect fossil stumps was identified as Xenoxylon sp. |
| キーワード | erect fossil stump fossil forest Nariwa Group Upper Triassic Xenoxylon |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2012-12-26 |
| 巻 | 19巻 |
| 号 | 1号 |
| 開始ページ | 25 |
| 終了ページ | 37 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120005232329 |
| JaLCDOI | 10.18926/ESR/49210 |
|---|---|
| タイトル（別表記） | Estimation of SPM concentration distribution over the central Seto Inland Sea |
| フルテキストURL | esr_019_1_019_024.pdf |
| 著者 | 海老 貴宏| 松本 宏文| 山川 純次| |
| 抄録 | Ordinary Kriging, OK, and Regression Kriging, RK, are the spatial statistical methods that are possible to estimate a horizontal distribution in a study area from discrete data. OK is the method which takes account of only spatial auto-correlation structure of the data, while RK is the method which takes account of an interrelationship between spatial auto-correlation structure and some auxiliary variables to minimize the estimation error. Analytical processing for OK and RK methods was performed by the R-Language (R Core Team, 2012) and its some additional libraries. The auxiliary variables required to perform RK method were prepared by a GIS application, Quantum GIS (Quantum GIS Development Team, 2012). The 3-dimensional geographic representation of the estimation maps was performed by the Google Earth (Google, 2012). In this report, OK and RK methods were applied to one of the Earth scientific information, SPM (Supended Particulate Matter). Then, these methods were considered by comparing two estimation maps, and finally considered qualitatively by displaying these maps in the Google Earth. |
| キーワード | Ordinary Kriging Regression Kriging Auxiliary variable R-Language Google Earth |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2012-12-26 |
| 巻 | 19巻 |
| 号 | 1号 |
| 開始ページ | 19 |
| 終了ページ | 24 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120005232328 |
| JaLCDOI | 10.18926/ESR/49209 |
|---|---|
| タイトル（別表記） | The temperature and pressure conditions of synthetic Sibirskite and Parasibirskite |
| フルテキストURL | esr_019_1_013_017.pdf |
| 著者 | 狩野 正裕| 山川 純次| |
| 抄録 | Sibirskite (CaHBO ) and parasibirskite ₃ are in the relation of polymorphism, these are regarded as the alteration products of takedaite (Ca₃B₂O₆), occurs at Fuka mine, Okayama Prefecture. The synthesis of parasibirskite was reported by the Schäfer (1968a, b) etc. and the synthesis of sibirskite was reported by the Sun et al. (2011). To determine the formation condition of sibirskite and parasibirskite in the natural, they were synthesized from the natural takedaite (Ca₃B₂O₆). As a result, both of sibirskite and parasibirskite were formed by the duration time of 7 days with 1000 kg/cm2 and 300 oC, on the other hand, only sibirskite was formed by the duration time of 14 days with the same condition. In addition, the mixtures of sibirskite and parasibirskite were examined under the various temperatures and pressures of hydrothermal conditions. As a result, the upper limit of the stable temperature and pressure conditions of sibirskite was estimated between 350 oC and 400 oC at 1500 kg/cm2, and between 400 oC and 450 oC at 500 kg/cm2 . In the higher temperature than the condition, sibirskite were changed into shimazakiite (Ca₂B₂O₅). |
| キーワード | Sibirskite Parasibirskite Shimazakiite Fuka Hydrothermal synthesis |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2012-12-26 |
| 巻 | 19巻 |
| 号 | 1号 |
| 開始ページ | 13 |
| 終了ページ | 17 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120005232327 |
| 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 |
| 巻 | 19巻 |
| 号 | 1号 |
| 開始ページ | 5 |
| 終了ページ | 11 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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/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 |
| 巻 | 19巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 4 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 |
| 著者 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2012-12-26 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 19巻 |
| 号 | 1号 |
| 資料タイプ | その他 |
| 著者 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2012-12-26 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 19巻 |
| 号 | 1号 |
| 資料タイプ | その他 |
| 著者 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2011-12-26 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 18巻 |
| 号 | 1号 |
| 資料タイプ | その他 |
| 著者 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2011-12-26 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 18巻 |
| 号 | 1号 |
| 資料タイプ | その他 |
| JaLCDOI | 10.18926/ESR/47748 |
|---|---|
| タイトル（別表記） | Characteristics of typhoon tracks and large-scale atmospheric fields associated with the typhoon approach to the Japan Islands in early summer |
| フルテキストURL | esr_018_1_011_018.pdf |
| 著者 | 濱本 奈津美| 加藤 内藏進| 中山 祐貴| 塚本 修| |
| 抄録 | The number of typhoons approaching the Japan Islands is much smaller in May and June than in August to September. However, some typhoons abnormally approach to the Japan Islands in May or June as in 2004. The present study investigated the characteristics of the typhoon tracks and the large-scale fields in May and June associated with the approach of typhoons to the Japan Islands. Climatologically speaking, typhoons are generally formed in the lower latitude in May and early June, and tend to turn to ENE-ward before they reach ~ 20N in May by the upper- and middle-level westerly wind. In June, the upper-level easterly wind associated with the Tibetan high seems to prevent typhoons from approaching to the Japan Islands. However, when the cell-type subtropical high and the deep westerly trough in its western side are formed with the SW-ly from the lower to the middle latitude, a favorable situation for the northward invasion of the typhoon can be realized in May. On the other hand, the formation of the barotropic-like subtropical high to the southeast of the Japan Islands seems to enable a typhoon to approach to the Japan Islands by the S-ly wind around the subtropical high. |
| キーワード | typhoon tracks in early summer large-scale atmospheric fields in early summer |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2011-12-26 |
| 巻 | 18巻 |
| 号 | 1号 |
| 開始ページ | 11 |
| 終了ページ | 18 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 著作権者 | © 2011 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| 論文のバージョン | publisher |
| NAID | 120003796476 |
| JaLCDOI | 10.18926/ESR/47747 |
|---|---|
| タイトル（別表記） | Newly proposed landform division in the Kibi Plateau area: Application for a hazard map of landslides |
| フルテキストURL | esr_018_1_005_010.pdf |
| 著者 | 鈴木 茂之| 大溝 佑奈| 平田 稔| 西垣 誠| |
| 抄録 | The Kibi Plateau is characterized by horizontal skylines and they are considered to be an uplifted peneplain. Landform of the plateaus in central part of Okayama Prefecture is divided into "Kibi plateau landform" and "Recent dissecting landform". The Kibi plateau landform is composed of low relief surface and relict mountain. The altitude of the low relief surface varies from 300 to 450m in Kayo area, and 200 to 350m in Kanayama area. The Recent dissecting landform is characterized by escarpment and cuts the Kibi plateau landform. Knick-point is formed at the boundary between two landforms and steep slope is distributed just below the knick-point. The steep slope of the recent dissecting landform is unstable and a potential of landslide is high. |
| キーワード | Kibi Plateau landslide knick-point Okayama Prefecture |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2011-12-26 |
| 巻 | 18巻 |
| 号 | 1号 |
| 開始ページ | 5 |
| 終了ページ | 10 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 著作権者 | © 2011 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| 論文のバージョン | publisher |
| NAID | 120003796475 |
| JaLCDOI | 10.18926/ESR/47746 |
|---|---|
| タイトル（別表記） | KED estimated distribution of Earth Scientific Information |
| フルテキストURL | esr_018_1_001_003.pdf |
| 著者 | 山川 純次| 海老 貴宏| 松本 宏文| |
| 抄録 | KED, the Kriging with External Drift, is one of the spatial statistical method for estimating some distribution from the discrete spatial sampled data set about the research field. The KED uses the kriging method (Matheron, 1973) with some auxiliary map to minimize the estimated error. The KED procedure was performed by the R-Language (Ihaka and Gentleman, 1996) using some geostatistical libraries. The auxiliary maps required by the KED were prepared by the authors with some GIS applications. The 3-dimensional geographic representations for the estimated distribution were performed by the Google Earth (Google, 2011). In this report, the KED was applied to some Earth scientific information to show the fundamental scheme of the method. |
| キーワード | KED Universal kriging Regression kriging R-Language Google Earth |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2011-12-26 |
| 巻 | 18巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 3 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 著作権者 | © 2011 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| 論文のバージョン | publisher |
| NAID | 120003796474 |
| 著者 | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| 発行日 | 2011-12-26 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 18巻 |
| 号 | 1号 |
| 資料タイプ | その他 |