| JaLCDOI | 10.18926/ESR/13888 |
|---|---|
| タイトル（別表記） | Relationship between the water quality of three main rivers and geology of Okayama Prafecture |
| フルテキストURL | ESR_8_1_29.pdf |
| 著者 | 木下 卓也| 松田 敏彦| |
| 抄録 | Concentrations of inorganic major components (Ca2+, Mg2+, Na+, K+, ΣFe, AI3+, HCO3, SO4, CI-, NO3, F- and SiO2) were measured in 57 water samples from three main rivers, the Yoshii, Asahi and Takahashi Rivers and their tributaries. The water quality is discussed in relation to the geological environment in the drainage basin of three rivers. The following results were obtained from the investigation. The degree of influence of rocks on the water quality was limestone≫basic rocks>clastic rocks>andesite>rhyolite>gramite. The influence of geology is clear in the riverhead but it is obscure in the downstream. The concentration of each component increases generally from the upper stream to the lower stream but that of SiO2 only decreases in the lower stream. Kaolinite is a stable mineral as a weathering prodouct from the ion compositions of three rivers. In a rough estimation, Yoshii, Asahi and Takahashi Rivers weather 303,000t, 433,000t and 1,033,000t of the rocks respectively from their basins in a year. The syrface of their basins are scraoed off 0.06mm, 0.11mm and 0.15mm respectively in a year. |
| キーワード | Water quality River water Geology of basin Yoshii River Asahi River Takahashi River Okayama Prefecture |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2001-09-20 |
| 巻 | 8巻 |
| 号 | 1号 |
| 開始ページ | 29 |
| 終了ページ | 38 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120002310339 |
| JaLCDOI | 10.18926/ESR/13887 |
|---|---|
| タイトル（別表記） | Trace of the Median Tectonic Line in Mima area, eastern Shikoku |
| フルテキストURL | ESR_8_1_13.pdf |
| 著者 | 水井 良暢| 橘 徹| 鈴木 茂之| |
| 抄録 | Tracing outcrops of shear zone were used to describe the geometry and structure of the Median Tectonic Line in Mima area, eastrn Shikoku. A distinct new fault outcrop was discovered between the Mino and Ikuchi Faults at the northern slope of the Mt. Boso. These two faults are regarded as a single continuous fault. The analysis of surface fabrics of quartz in fault in fault gauge has been carried out to determine relative fault activity events. |
| キーワード | surface fabrics fault gauge Mino-Ikuchi Fault Median Tectonic Line |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2001-09-20 |
| 巻 | 8巻 |
| 号 | 1号 |
| 開始ページ | 13 |
| 終了ページ | 28 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120002310656 |
| JaLCDOI | 10.18926/ESR/13885 |
|---|---|
| タイトル（別表記） | Miocene Ukan Formation, Ukan Area, Okayama Prefecture, Southwest Japan |
| フルテキストURL | ESR_8_1_1.pdf |
| 著者 | 藤原 貴生| 田口 栄次| 鈴木 茂之| |
| 抄録 | In this paper, we deal with the Miocene Ukan Formation, sporadically distributed in Ukan-cho, Okayama prefecture, from a viewpoint of analysis of lithology and molluscan assemblages. The Ukan Formation is lithostratigraphically divided into the Suzuoka Conglomerate, Yamagata Muddy Sandstone, Shimoyokomi Sandstone and Conglomerate, Azechi Sandstone and Conglomerate, Tsuneyama Siltstone Members in ascending order. The following 6 molluscan assemblages are recognized. The lower four members and the last member is correlative to the Lower Sandstone and Upper Shale Formation of the Bihoku Group, respectively judging from lithology and fauna. The temporal chages of the above mentioned molluscan assemblages represents that gradual deeping of sea during the depositional period from the Suzuoka Conglomerate and Yamagata Muddy Sandstone Members to the Azechi Sandstone and Conglomerate Member via the Shimoyokomi Sandstone and Conglomerate Member, and abrupt deeping of sea seems to have happened between the Azechi Sandstone and Conglomerate Member and the Tsuneyame Siltstone Member. |
| キーワード | Lithology Molluscan assemblage Paleoenvironmental change Ukan Miocene |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2001-09-20 |
| 巻 | 8巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 12 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120002310604 |
| 著者 | 上甲 実| 清原 康友| 塚本 修| |
|---|---|
| 発行日 | 2002-09-20 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 9巻 |
| 号 | 1号 |
| 資料タイプ | 紀要論文 |
| 著者 | 楊 勤| 塚本 修| |
|---|---|
| 発行日 | 2002-09-20 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 9巻 |
| 号 | 1号 |
| 資料タイプ | 紀要論文 |
| 著者 | 藤原 貴生| 鈴木 茂之| |
|---|---|
| 発行日 | 2002-09-20 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 9巻 |
| 号 | 1号 |
| 資料タイプ | 紀要論文 |
| JaLCDOI | 10.18926/ESR/13880 |
|---|---|
| タイトル（別表記） | Pyrite spots formed along slaty cleavage texture of pelitic rocks of the Tamba Belt, Ujitawara Town, Kyoto Prefecture, Southwest Japan. |
| フルテキストURL | ESR_9_19.pdf |
| 著者 | 三上 禎次| 武蔵 野實| 鈴木 茂之| |
| 抄録 | Pyrite spots were identified in pelitic rocks from the Ujitawara area, southernmost part of Tamba belt. XMA analysis shows that the spots are composed of pyrite. The spots occur along slaty cleavage plane and form spotted shape of diameter of about 5mm. |
| キーワード | The Tamba Group Ujitawata pelitic rocks pyrite spots slaty cleavage |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2002-09-20 |
| 巻 | 9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 | 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 | 120002310485 |
| 著者 | 東 裕行| 三枝 誠行| 福田 宏| |
|---|---|
| 発行日 | 2002-09-20 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 9巻 |
| 号 | 1号 |
| 資料タイプ | 紀要論文 |
| 著者 | Saieev K| 小山内 康人| |
|---|---|
| 発行日 | 2002-09-20 |
| 出版物タイトル | Okayama University Earth Science Report |
| 巻 | 9巻 |
| 号 | 1号 |
| 資料タイプ | 紀要論文 |
| JaLCDOI | 10.18926/ESR/13876 |
|---|---|
| タイトル（別表記） | A note on dental nomenclature in the Rhinocerotidae |
| フルテキストURL | earth_science_reports_010_1_33.pdf |
| 著者 | 福地 亮| |
| 抄録 | The terminology for the molars of rhinoceorses is mainly derived from Osborn (1888). However, there is often confusion surrounding nomenclature of cheek teeth and the measuring point of the teeth. The nomenclature for the teeth of rhinoceroses and the controversy were reviewed. In this paper, I suggest the new nomenclatures that are composed of 24 elements for the upper cheek teeth and 12 ones for the lower ones and I also suggest the measuring points of teeth of the Rhinocerotidae. |
| キーワード | teminology teeth rhinoceros |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2003-12-20 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 33 |
| 終了ページ | 37 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120002310241 |
| 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 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 23 |
| 終了ページ | 31 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 |
| JaLCDOI | 10.18926/ESR/13874 |
|---|---|
| タイトル（別表記） | Distributions and ages of the Paleogene deposits in the Kibi Plateau Area, and Paleogene paleogeography |
| フルテキストURL | earth_science_reports_010_1_15.pdf |
| 著者 | 田中 元| 鈴木 茂之| 宝谷 周| 山本 裕雄| 壇原 徹| |
| 抄録 | The "Kibi Plateau" forms a unique geomorphic province with the gently-sloping and stable continental feature. Gravel deposites called the "Mountain Gravels", are distributed sporadically in the Kibi Plateau, and have been considered Pliocene deposits. However, recent fission-track ages of the tuff beds intercalated in the deposits have indicated that the ago of deposits are Paleogen in the age. So far, fission-track ages (using zircon) of 61 to 65, 55, 37, 34 to 35 and 27 Ma are obtained. Remaining the belt-like distributions of the Paleogene gravelly valley-full deposits suggest that the Kibe Plateau has been keeping as a stable block, and repeated periods of incision followed by sedimentation of valley-fill deposits are occurred in the area during Paleogene period. |
| キーワード | Kibi Plateau gravelly valley-fill deposites fission-track ages Paleogene palaeogeography |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2003-12-20 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 15 |
| 終了ページ | 22 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120002310517 |
| JaLCDOI | 10.18926/ESR/13873 |
|---|---|
| フルテキストURL | earth_science_reports_010_1_11.pdf |
| 著者 | 鈴木 功| 井上 靖| 小田 仁| 森岡 正名| |
| 抄録 | Resonant frequencies for a single crystad diopside sphere are measured accurately and rhirteen elastic moduli are reluced by the least squares calculation, A set of mduli gives theoretical resonant frequencies close enough to the observed ones. |
| キーワード | diopside single crystal resonace sphere elasticity |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2003-12-20 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 11 |
| 終了ページ | 14 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 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 | 120002310552 |
| JaLCDOI | 10.18926/ESR/13871 |
|---|---|
| フルテキストURL | earth_science_reports_010_1_1.pdf |
| 著者 | 冨谷 尚士| 井上 佳紀| 加瀬 克雄| |
| 抄録 | In order to know the reason why the Cu/Zn-Pb ratios of skarn-type deposits related with the ilmenite-series granitic rocks are markedly higher than those related with the magnetite-series, comparative mineralogical studies were carried out for the two types of granitic rocks in the Chugoku district. An attention was focused on the be-havior of Zn during the crystallization of granitic magma, because Zn contents of mafic minerals can be obtained by non-destructive electron microprobe analyses. Microscopic observation indicats that no sphalerite occurs in the magnetite-series granitic rocks, which im-plies that the magmas corresponding to the granitic rocks were undersaturated in respect to ZnS. Electron micro-probe analyses revealed that the Fe/(Fe+Mg) ratios of mafic minerals such as biotite and hornblende in the ilmen-ite-series granitic rocks are remarkably higher than those in the magnetite-series, and the Zn contents are posi-tively correlated with the Fe/(Fe+Mg) ratios in the ilmenite-series granitic rocks. Also the Zn/Fe rations seem to be slightly higher in the ilmenite-series granitic rocks. In contrast, the correlation between Zn contents and Fe/(Fe+Mg) ratios is ambiguous in magnetite-series granitic rocks. With a progress of crystallization differentiation, therefore, Zn may be removed more effectively in the il-menite-series granitic magma, and the contents may be growing scarce in the fractionated ilmenite-series granitic magma. On the other hand, magnetite-series granitic magma probably increases the Zn-contents in the advanced stage of the crystallization. The hydrothermal fluids genetically related to the fractionated magnetite-series grani-tic magma are likely to be enriched in Zn, being favorable for the formation of Zn-rich deposits. |
| キーワード | Magnetite-series Ilmentie-series Granitic rocks Zn contents Mafic minerals Ore deposit |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2003-12-20 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 10 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 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 | 120002310429 |
| 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 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 39 |
| 終了ページ | 47 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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/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 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 33 |
| 終了ページ | 37 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 |
| JaLCDOI | 10.18926/ESR/13867 |
|---|---|
| タイトル（別表記） | Paleoceanography of the Eastern Asia from the Last Glacial Maximum to the early Holocene |
| フルテキストURL | earth_science_reports_011_1_23.pdf |
| 著者 | 菅 浩伸| |
| 抄録 | A series of marginal seas that are separated from the Pacific Ocean by island arcs developed in Eastern Asia. The environmental property of these marginal seas amplified under a sea-level lowstand during the Last Glacial Maximum (LGM). The Japan Sea was covered by low salinity water during the LGM. At the beginning of the post-glacial sea-level rise, the Oyashio Current firstly flowed into the Japan Sea throught the Tsugaru Strait. The influx of the Tsushima Current started around 10,000 yBP and become vigorously after 8,000 yBP. Meanwhile, the northward migration and influx of the Kuroshio Current into East China Sea started around 10,000 yBP and strengthened after 7,500 yBP. The route alternation of the Kuroshio Current might have contributed to the establishment of the Tsushima Current and acted as a trigger for the drastic environmental changes around the merginal seas in Eastern Asia at the time of the post-glacial sea-level rise. |
| キーワード | Paleoceanography Last Glacial Maximum |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2004-12-31 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 23 |
| 終了ページ | 31 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120002310301 |
| JaLCDOI | 10.18926/ESR/13863 |
|---|---|
| タイトル（別表記） | Increase Rate of fCO2 in the Eastern Equatorial Pacific Ocean |
| フルテキストURL | earth_science_reports_011_1_15.pdf |
| 著者 | 近藤 文義| 塚本 修| 渡邉 修一| |
| 抄録 | In the Eastern Equatorial Pacific Ocean, increase rates of fCO2 in the air and the ocean were evaluated using the CDIAC data set. The fCO2 in the air was increasing about 1.28μatm/year during 1957-1995. This result is almost same as the rate at the Mauna Loa, Hawaii in Tropical Pacific Ocean. The increase rate of fCO2 in the seawater was estimated as 1.64μatm/year. In this study it is found that the increase rate of fCO2 in the seawater is the almost same as that of fCO2 in the air. This reault supports the result on the snapshot analysis of Takahashi et al. (1983) in thr North Atlantic Ocean during 1958-1982. It is smaller than the result including seasonal variation in the Eastern Subtropical Pacific Ocean. These reault indicated that the anthropogenic CO2 in the air has affected fCO2 in seawater through CO2 gas exchange between the atmosphere and the ocean. It is found that fCO2 in the seawater has increased in the Eastern Equatiorial Pacific Ocean in spite of the large CO2 source region. It suggested that CO2 source potential has not changed in this ocean durung 1957-1995. |
| キーワード | fCO2 Increase Rate Eastern Equatorial Pacific Ocean E1 Nino La Nina |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2004-12-31 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 15 |
| 終了ページ | 22 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 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 | 120002310498 |
| JaLCDOI | 10.18926/ESR/13862 |
|---|---|
| タイトル（別表記） | β-, γ-相(Mg,Fe)2SiO4の弾性率の温度変化 : 補遺 |
| フルテキストURL | earth_science_reports_011_1_7.pdf |
| 著者 | 間山 憲仁| 鈴木 功| |
| 抄録 | We measured the resonant frequencies for sphere specimens of the high pressure phases, β-and γ-(Mg0.91Fe0.09)2SiO4 from 298 to 470 K. The adibatic bulk modulus Ks and shear modulus μ at 298 K were determined to be Ks=165.72(6), μ=105.43(2) GPa for the β-phase, and Ks=185.1(2), μ=118.22(6) GPa for the γ-phase, respectively. The average slopes of the moduli at the measured temperature ranges were found to be ∂Ks/∂T=-0.175(3), ∂μ/∂T=-0.0159(1) GPaK-1 for the β-phase and ∂Ks/∂T=-0.193(6), ∂μ/∂T=-0.148(3) GPaK-1 for the γ-phase. The numerals in parentheses indicate probeble errors in the last place. In this technical report, we describe the observed frequencies and calcuation method to obtain elastic moduli, in details. |
| キーワード | Wadsleyite Ringwoodite Elastic moduli |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2004-12-31 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 7 |
| 終了ページ | 14 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 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 | 120002310650 |
| JaLCDOI | 10.18926/ESR/13861 |
|---|---|
| タイトル（別表記） | 重力異常データのカラムインバージョンから見積もったモホ不連続面の形状 |
| フルテキストURL | earth_science_reports_011_1_1.pdf |
| 著者 | 福永 真理子| 小田 仁| 志知 竜一| |
| 抄録 | We present an inversion method, called "column inversion", to retrieve two-dimensional variation of the depth to the Moho discontinuity from Bouguer gravity anomaly data, assuming that a density jump between the lower crust and upper mantle is regionally invariant. The inversion method is applied to reveal the apatial undulation of the Moho discontinuity in the Chugoku and Shikoku districts, southwest Japan. The result shows that the Moho is deep in the land area and shallow in the sea area. The Moho is anomalously deep in the west regions of Shikoku and Chugoku districts, where the prominent negative gravity anomaly is observed. The two-dimensional variation of the Moho depth is quite similar to that determined by inversion of the first P-arrival time data. The column inversion of the Bouguer gravity anomaly data is proved to be useful for determining the fine structure of the Moho discontinuity undulation. |
| キーワード | Bouguer Gravity Anomaly Column Inversion Moho Discontinuity Chugoku and Shikoku Districts |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2004-12-31 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 5 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 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 | 120002310563 |