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Tanaka, Gengo ; 田中, 源吾
概要:
金沢大学国際基幹教育院GS教育系<br />島根県,出雲市菅沢の大森層より26属42種の介形虫化石を抽出し,2つの介形虫群(Ambostracon-Argilloecia-Cytheropteron群集およびPaijenborchella-
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Palmoconcha-Urocythereis pohangensis群集)を認めた.これらの群集は冷温〜温暖な公海の下浅海環境を示唆する.大森層および布志名層からの介形虫化石群の主成分分析は,その堆積環境が上部層準に向かってしだいに深くなっていったことを示唆する.5新種(Cytheropteron shimanense, Loxoconcha izumoensis, Paradoxostoma yakumotatsunus, Schizocythere sakanoueiおよびUrocythereis sugesawensis)を記載した.<br />Ostracods from the Omori Formation in Sugesawa (Izumo City, Shimane Prefecture) comprise 42 species belonging to 26 genera. Five new species, Cytheropteron shimanense, Loxoconcha izumoensis, Paradoxostoma yakumotatsunus, Schizocythere sakanouei and Urocythereis sugesawensis are described. Two ostracod assemblages (Ambostracon-Argilloecia-Cytheropteron assemblage and Paijenborchella-Palmoconcha-Urocythereis pohangensis assemblage) are recognized. These assemblages indicate that the uppermost of the Omori Formation was deposited under the environments from cool to warm open sublittoral condition. Principal components analysis of ostracod assemblages from the Omori and Fujina Formations indicates that, in general, the depositional environment becomes deeper and deeper towards the upper horizon.
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由比, 政年 ; 阿部, 成紀
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日本海沿岸においてもこれまでに多くの津波災害が報告されている．本研究では，過去に日本海東縁部で発生し，能登半島に襲来した3つの歴史津波（1833年山形沖，1741年渡島大島， 1964年新潟沖，1983年日本海中部）を対象に非線形長波モデル
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に基づく数値解析を行ってその伝播特性を検討した．数値計算結果は痕跡高記録およびNOWPHAS波浪観測波形と良好に一致し，その有効性が確認された．4つの津波はいずれも能登半島北方に広がる浅瀬領域で屈折しエネルギー集中による波高増幅を伴って半島北岸に襲来する特性を示した．山形および新潟沖を波源とする場合は, 半島北岸中央部で最大波高を取る波高分布となり，より北方に波源が位置する場合には，半島北岸で多峰的な波高分布を示す結果となった． Historically, tsunami disasters have been repeated on the Japan Sea coast. Among them, this study focuses on tsunamis that have caused various damages to the Noto Peninsula, Ishikawa, Japan. The propagation of four representative historical tsunamis that originated in the eastern margin of the Japan Sea were simulated on the basis of the Nonlinear Shallow Water Equations. The applicability of the numerical model was verified through comparison with historical records and NOWPHAS observation. Good agreements were obtained. The numerical results for the tsunamis show the occurrence of strong refraction off the Noto Peninsula, which caused significant concentration of tsunami energy.<br />出版者照会後に全文を公開
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Li, Ying ; Yoshida, Shota ; Chondo, Yvonne ; Nassar, Hossam ; Tang, Ning ; Araki, Yuki ; Toriba, Akira ; Kameda, Takayuki ; Hayakawa, Kazuichi
概要:
An on‑line concentration and fluorescence determination HPLC for polycyclic aromatic hydrocarbons (PAHs) in seawater was
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proposed. An online concentration column packed with octadecyl polyvinyl alcohol polymer, a pump and a column switching valve were introduced in the conventional HPLC with a fluorescence detector. Only 1.0–100 mL seawater sample was introduced into the concentration column at 1.0 mL min−1 without any other pretreatment except filtration. Then the trapped PAHs totally flew into the separation column and eluted separately to be detected fluorogenically. The proposed method had good linearity with correlation coefficients (r) ranged from 0.951 to 0.998, and limits of detection ranged from 0.002 to 0.50 ng L−1 for 15 PAHs as 100 mL seawater was loaded. The sensitivity of the method was 10 to 100 times higher than those reported by other works. The proposed method was applied to the determination of PAHs in the seawater samples collected in the Japan Sea with satisfactory results and to check the present benzo[a]pyrene concentration at the beaches in Noto peninsula, Japan polluted with C-heavy oil spilled from the tanker in 1997.
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Domitsu, Hanako ; Oda, Motoyoshi
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Modern planktic foraminifera in 51 surface sediments from the Japan Sea, a marginal sea of the western North Pacific, we
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re studied to reveal the relationships between geographical distribution and surface water masses in the Japan Sea. Twenty-four species belonging to 10 genera were identified, of which nine species, namely Neogloboquadrina incompta, Neogloboquadrina pachyderma, Globigerina quinqueloba, Globigerina bulloides, Globigerinoides ruber, Neogloboquadrina dutertrei, Pulleniatina obliquiloculata, Globigerinoides tenellus, and Globigerinita glutinata are predominant. We recognized four geographical distribution patterns of these dominant species that are related to hydrographic conditions in the Japan Sea. The transitional water formed by the mixture between the warm Tsushima Current and cold waters in the Japan Sea is optimal for N. incompta, while the distribution of N. pachyderma is matched with cold water in the northern Japan Sea. Globigerina quinqueloba and G. bulloides appear to be associated with less saline, nutrient-rich river water from the Changjiang (Yangtze River), and G. ruber, N. dutertrei, P. obliquiloculata, G. tenellus, and G. glutinata can be regarded as indicators of Tsushima Current Water. © by the Palaeontological Society of Japan.
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Domitsu, Hanako ; Oda, Motoyoshi
概要:
金沢大学大学院自然科学研究科<br />Modern planktic foraminifera in 51 surface sediments from the Japan Sea, a marginal sea of the weste
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rn North Pacific, were studied to reveal the relationships between geographical distribution and surface water masses in the Japan Sea. Twenty-four species belonging to 10 genera were identified, of which nine species, namely Neogloboquadrina incompta, Neogloboquadrina pachyderma, Globigerina quinqueloba, Globigerina bulloides, Globigerinoides ruber, Neogloboquadrina dutertrei, Pulleniatina obliquiloculata, Globigerinoides tenellus, and Globigerinita glutinata are predominant. We recognized four geographical distribution patterns of these dominant species that are related to hydrographic conditions in the Japan Sea. The transitional water formed by the mixture between the warm Tsushima Current and cold waters in the Japan Sea is optimal for N. incompta, while the distribution of N. pachyderma is matched with cold water in the northern Japan Sea. Globigerina quinqueloba and G. bulloides appear to be associated with less saline, nutrient-rich river water from the Changjiang (Yangtze River), and G. ruber, N. dutertrei, P. obliquiloculata, G. tenellus, and G. glutinata can be regarded as indicators of Tsushima Current Water. © by the Palaeontological Society of Japan.
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Tsukawaki, Shinji ; Domitsu, Hanako ; Fukaya, Yasuyuki ; Furuuchi, Masami ; Kamada, Kotaro ; Kamiya, Takahiro ; Kumakiri, Michiko ; Murase, Takahiro ; Sakano, Takeo ; Seikai, Tadahisa ; Takahashi, Yoshie
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Tsukawaki, Shinji ; Ozawa, Hirokazu ; Ooji, Akihito
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由比, 政年 ; 楳田, 真也
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Tsukawaki, Shinji ; Domitsu, Hanako ; Oda, Motoyoshi
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