| JaLCDOI | 10.18926/ESR/15034 |
|---|---|
| Title Alternative | 中国寧夏地域における日照時間から日積算日射量の推定 |
| FullText URL | 015_079_086.pdf |
| Author | Yang, Qin| Tsukamoto, Osamu| |
| Abstract | For the estimation of daily solar radiation from sunshine duration, observation data of Yinchuan station in Ningxia, China was used. Using a linear relationship between solar radiation and extraterrestrial radiation including relative sunshine duration and daylength, we obtained local coefficients s a =0.18, s b =0.62 from past five years data(1981-1985). Using the same method, coefficients for Guyuan region were confirmed too as a representative of south part of Ningxia province. Applying the local coefficients and calculation formula of solar radiation, we validated daily solar radiation of two years(1986-1987) of Yinchuan station and four years(1991-1994) of Guyuan station. The results showed high correlation coefficients of R2=0.94 in Yinchuan and R2=0.85 in Guyuan. Error analysis was applied using mean bias error(MBE), mean absolute bias error(MABE), root mean square error(RMSE)，mean absolute percentage error(MAPE) on solar radiation of Yinchuan(1973-2006) and Guyuan(1986-2006) stations. Results showed that mean absolute bias error(MABE) was less than 13% and 17% in Yinchuan station and Guyuan station respectively. Then we have applied this method to the estimation of daily solar radiation at ‘Yongning’ station(near Yinchan) with the sunshine duration data at ‘Yongning’. The estimated values were compared with observed daily solar radiation at Yinchuan as past twelve years data(1989-2000). The results showed good linear relationship with high correlation coefficient of R2= 0.88. |
| Keywords | Daily solar radiation Extraterrestrial radiation Relative sunshine duration Local coefficient |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2009-03-31 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 79 |
| End Page | 86 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002307142 |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2009-12-25 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume16 |
| Issue | issue1 |
| Content Type | Others |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2009-12-25 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume16 |
| Issue | issue1 |
| Content Type | Others |
| 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 | Japanese |
| 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/19849 |
|---|---|
| Title Alternative | ガーナ，アシャンティ火山帯南部に分布する古原生代変火山岩類のSr-Nd 同位体組成 |
| FullText URL | 016_009_028.pdf |
| Author | Dampare, Samuel| Shibata, Tsugio| Asiedu, Daniel| Okano, Osamu| Manu, Johnson| Sakyi, Patrick| |
| Abstract | Neodymium (Nd) and strontium (Sr) isotopic data are presented for Paleoproterozoic metavolcanic rocks in the southern part of the Ashanti volcanic belt of Ghana. The metavolcanic rocks are predominantly basalts/basaltic andesites and andesites with minor dacites. Two types of basalts/basaltic andesites (B/A), Type I and Type II, have been identified. The Type I B/A are stratigraphically overlain by the Type II B/A, followed by the andesites and the dacites. The analyzed volcanic rocks commonly have low initial (87)Sr/(86)Sr ratios consistent with previous studies on Paleoproterozoic rocks from the West African craton. The LREE-depleted, tholeiitic Type I B/A exhibit back-arc basin geochemical signatures and show high positive epsilon Nd (i.e., ε(Nd) (2.1 Ga) = +3.89 to +7.21), which suggest a long term depleted source and also indicate that they were produced in an entirely oceanic environment devoid of influence of continental crust. The isotope signatures are thus consistent with the previously published trace element data of the Type I basalts/basaltic andesites in suggesting that their parent magma was generated from a depleted mantle. The Type I B/A have Nd model ages (T(DM2)) of 1.83–2.09 Ga similar to their formation ages, suggesting that they were juvenile at their time of formation. The andesites and the Type II B/A andesites show LREE-enriched patterns and exhibit characteristics of subduction zone-related magmas, and show initial ε(Nd) (2.1Ga) values of –1.15 to + 1.35 and Nd model ages (T(DM2)) of 2.32–2.58 Ga. The LREE-enriched dacitic porphyry also exhibits characteristics of subduction zone-related magmas, and have initial ε(Nd) (2.1Ga) value of –2.24 and Nd model ages (T(DM2)) of 2.64 Ga. The Nd isotopic data confirms the juvenile character of the Birimian crust, but also suggests some contributions of a pre-Birimian crustal material (or Archean?) in the genesis of some of the metavolcanic rocks. Our isotopic result is consistent with the island arc complex model which views Paleoproteozoic terranes of West Africa in the context of subduction–accretion processes. |
| Keywords | Sr–Nd isotopes petrogenesis tectonic setting Birimian metavolcanics Ashanti volcanic belt |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2009-12-25 |
| Volume | volume16 |
| Issue | issue1 |
| Start Page | 9 |
| End Page | 28 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002308985 |
| JaLCDOI | 10.18926/ESR/19850 |
|---|---|
| Title Alternative | 岡山県に分布する白亜紀前期羽山層砕屑物質の供給源：砕屑粒の鉱物化学組成とモード組成から導かれる制約 |
| FullText URL | 016_029_042.pdf |
| Author | Asiedu, Daniel K.| Suzuki, Shigeyuki| Shibata, Tsugio| |
| Abstract | Petrographic and phase chemistry studies of detrital grains were carried out on sandstones from the Lower Cretaceous Hayama Formation, Inner Zone of Southwest Japan, to determine their provenance and the tectonic setting during the early Cretaceous. The results of the modal mineralogy suggest that the Hayama Formation has magmatic arc provenance and that deposition of the sediments took place in the back-arc areas with detritus mostly derived from the magmatic arc and rifted continental margins. The chemical compositions of chromian spinel, chlorite and sphene indicate that significant proportions of the detrital grains were derived from mafic and/or ultramafic sources. The source areas are the mafic and ophiolitic rocks in the Sangun-Renge and Akiyoshi terranes and the felsic volcanic rocks probably from either the Akiyoshi terrane or a source not presently exposed in southwest Japan. However, minor amounts of the detritus were derived from the basement rocks; i.e., carbonates and siliciclastic rocks of the Akiyoshi terrane and the metamorphosed mafic rocks of the Chizu terrane. |
| Keywords | modal analysis sandstone mineral chemistry provenance Hayama Formation |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2009-12-25 |
| Volume | volume16 |
| Issue | issue1 |
| Start Page | 29 |
| End Page | 42 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002309000 |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2009-12-25 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume16 |
| Issue | issue1 |
| Content Type | Others |
| Author | Department of Earth Sciences, Faculty of Science, Okayama University| |
|---|---|
| Published Date | 2009-12-25 |
| Publication Title | Okayama University Earth Science Report |
| Volume | volume16 |
| 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/42457 |
|---|---|
| Title Alternative | 西南日本の熱変成超苦鉄質岩体中のかんらん石と輝石の組成変化に関する覚書 |
| FullText URL | esr_017_001_005.pdf |
| Author | Nozaka, Toshio| |
| Abstract | This short article presents some diagrams showing the compositional variations of primary and metamorphic olivine, orthopyroxene and clinopyroxene in peridotites and serpentinites from thermally metamorphosed ultramafic complexes in SW Japan. In contrast to olivine, which shows a gradual change of chemical composition corresponding with metamorphic grade, orthopyroxene and clinopyroxene show clear differences in composition between primary and metamorphic phases. Compared with primary pyroxenes, even though their compositions could be variable depending on original rock composition, metamorphic orthopyroxene and metamorphic clinopyroxene is clearly deficient in Cr(2)O(3) and CaO, and in Cr(2)O(3) and Al(2)O(3), respectively. These characteristics are useful for the discrimination between the pyroxenes of different origin. |
| Keywords | chemical composition olivine orthopyroxene clinopyroxene metaperidotite |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2010-12-24 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 5 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | © 2010 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120002753315 |
| 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 |
| 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/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 |
| 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 |
| 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/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 |
| 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 |
