result 211 件
| JaLCDOI | 10.18926/ESR/49212 |
|---|---|
| Title Alternative | 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 |
| FullText URL | esr_019_1_039_050.pdf |
| Author | Goda, Yasuhiro| Kato, Kuranoshin| Tsukamoto, Osamu| |
| Abstract | 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. |
| Keywords | ensemble of line-shaped precipitation bands precipitation in the warm sector of the Baiu front Baiu fronal rainfall |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2012-12-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 39 |
| End Page | 50 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005232330 |
| JaLCDOI | 10.18926/ESR/49211 |
|---|---|
| Title Alternative | 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- |
| FullText URL | esr_019_1_025_037.pdf |
| Author | Yukawa, Hirokazu| Terada, Kazuo| Sun, Ge| Suzuki, Shigeyuki| |
| Abstract | 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. |
| Keywords | erect fossil stump fossil forest Nariwa Group Upper Triassic Xenoxylon |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2012-12-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 25 |
| End Page | 37 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005232329 |
| JaLCDOI | 10.18926/ESR/49210 |
|---|---|
| Title Alternative | Estimation of SPM concentration distribution over the central Seto Inland Sea |
| FullText URL | esr_019_1_019_024.pdf |
| Author | Ebi, Takahiro| Matsumoto, Hirofumi| Yamakawa, Junji| |
| Abstract | 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. |
| Keywords | Ordinary Kriging Regression Kriging Auxiliary variable R-Language Google Earth |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2012-12-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 19 |
| End Page | 24 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005232328 |
| JaLCDOI | 10.18926/ESR/49209 |
|---|---|
| Title Alternative | The temperature and pressure conditions of synthetic Sibirskite and Parasibirskite |
| FullText URL | esr_019_1_013_017.pdf |
| Author | Kano, Masahiro| Yamakawa, Junji| |
| Abstract | 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). |
| Keywords | Sibirskite Parasibirskite Shimazakiite Fuka Hydrothermal synthesis |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2012-12-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 13 |
| End Page | 17 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005232327 |
| 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 | Japanese |
| Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005232326 |
| 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 | Japanese |
| Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005232325 |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2012-12-26 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume19 |
| Issue | issue1 |
| Content Type | Others |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2012-12-26 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume19 |
| Issue | issue1 |
| Content Type | Others |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2011-12-26 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume18 |
| Issue | issue1 |
| Content Type | Others |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2011-12-26 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume18 |
| Issue | issue1 |
| Content Type | Others |
| JaLCDOI | 10.18926/ESR/47748 |
|---|---|
| Title Alternative | Characteristics of typhoon tracks and large-scale atmospheric fields associated with the typhoon approach to the Japan Islands in early summer |
| FullText URL | esr_018_1_011_018.pdf |
| Author | Hamamoto, Natsumi| Kato, Kuranoshin| Nakayama, Yuuki| Tsukamoto, Osamu| |
| Abstract | 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. |
| Keywords | typhoon tracks in early summer large-scale atmospheric fields in early summer |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2011-12-26 |
| Volume | volume18 |
| Issue | issue1 |
| Start Page | 11 |
| End Page | 18 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2011 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120003796476 |
| JaLCDOI | 10.18926/ESR/47747 |
|---|---|
| Title Alternative | Newly proposed landform division in the Kibi Plateau area: Application for a hazard map of landslides |
| FullText URL | esr_018_1_005_010.pdf |
| Author | Suzuki, Shigeyuki| Omizo, Yuna| Hirata, Minoru| Nishigaki, Makoto| |
| Abstract | 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. |
| Keywords | Kibi Plateau landslide knick-point Okayama Prefecture |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2011-12-26 |
| Volume | volume18 |
| Issue | issue1 |
| Start Page | 5 |
| End Page | 10 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2011 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120003796475 |
| JaLCDOI | 10.18926/ESR/47746 |
|---|---|
| Title Alternative | KED estimated distribution of Earth Scientific Information |
| FullText URL | esr_018_1_001_003.pdf |
| Author | Yamakawa, Junji| Ebi, Takahiro| Matsumoto, Hirofumi| |
| Abstract | 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. |
| Keywords | KED Universal kriging Regression kriging R-Language Google Earth |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2011-12-26 |
| Volume | volume18 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 3 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2011 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120003796474 |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2011-12-26 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume18 |
| Issue | issue1 |
| Content Type | Others |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2011-12-26 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume18 |
| Issue | issue1 |
| Content Type | Others |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2010-12-24 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume17 |
| Issue | issue1 |
| Content Type | Others |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2010-12-24 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume17 |
| Issue | issue1 |
| Content Type | Others |
| JaLCDOI | 10.18926/ESR/42460 |
|---|---|
| Title Alternative | Representation of Earth scientific information by the Google(TM) Earth |
| FullText URL | esr_017_025_026.pdf |
| Author | Yamakawa, Junji| Ebi, Takahiro| Matsumoto, Hirofumi| |
| Abstract | The Google(TM) Earth is a GIS application provided by the Google, with versatile and high performance visualization and manipulation capability for geographic information. The Google Earth is also a multi-platform application, so the installation and running cost for research and education site is relatively low. The Earth scientific information also have a geographic information scheme, so the Google Earth has some potential to support the education and research field of the Earth science. In this report, some Earth scientific information were converted by the R-Language and its libraries for represent by the Google Earth. The 3-dimensional representation of the information will be able to support to understanding the specification of the data for the Earth scientific research and education field. |
| Keywords | Earth scientific information GIS Google Earth Kriging R-Language |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2010-12-24 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 25 |
| End Page | 26 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2010 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120002753318 |
| JaLCDOI | 10.18926/ESR/42459 |
|---|---|
| Title Alternative | DGEM: Digital Geological Elevation Model |
| FullText URL | esr_017_021_023.pdf |
| Author | Yamakawa, Junji| Ebi, Takahiro| Matsumoto, Hirofumi| |
| Abstract | DGEM, a Digital Geological Elevation Model, was developed using the digital geological map and the JPGIS DEM data with some GIS application and the R-Language. In the model, the information of the geological map was combined with the DEM by their coordinates. The integration of those two digital map was performed by the R-Language, so the model can be used by some useful presentation library of the language, such as the RGL, or by some geographical calculation libraries. Moreover, the DGEM will be used by the spatial statistical libraries of the R-Language to investigate some geological spatial distributed specifications. |
| Keywords | Digital geological map DEM JPGIS QuantumGIS R-Language |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2010-12-24 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 21 |
| End Page | 23 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2010 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120002753317 |
| JaLCDOI | 10.18926/ESR/42458 |
|---|---|
| Title Alternative | Comparison of large-scale cloud distribution and atmospheric fields around the Akisame (autumn rainfall) front in East Asia among 1993, 1994 and 1995 |
| FullText URL | esr_017_007_019.pdf |
| Author | Fukuda, Shigeko| Kato, Kuranoshin| |
| Abstract | In order to examine year-to-year variability of the Akisame (autumn rainfall) frontal zone in East Asia, large-scale cloud distribution and atmospheric fields around the frontal zone were compared among 1993, 1994 and 1995, when their characteristics were rather different among each other. While the Akisame frontal zone extended zonally and the deep convective clouds tended to appear in that frontal zone near the southern coast of the Japan Islands in 1993, the frontal zone extends from southwest to northeast and the large amount of precipitation was brought mainly in the northern Japan. In 1995, although the surface front on the weather maps appeared frequently also around the southern coast of the Japan Islands, the rainfall amount there was not so large. The area with frequent appearance of the deep convective clouds in the Akisame frontal zone was seen only to the east of the Japan Islands. As such, it is noted that the active area of the Akisame frontal zone shows rather large year-to-year variability also in the zonal direction. It is also suggested that such great variability of the Akisame frontal zone in the zonal direction seems to correspond to the variations of the subtropical high and the ITCZ in the western Pacific region around September. |
| Keywords | Akisame (autumn rainfall) front STFZ in early autumn year-to-year difference of Akisame front |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2010-12-24 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 7 |
| End Page | 19 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2010 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120002753316 |
