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11.
Organotin compounds (tributyltin (TBT), dibutyltin (DBT), monobutyltin (MBT), triphenyltin (TPT), diphenyltin (DPT), and monophenyltin (MPT)) were quantified in blue mussels, Mytilus edulis, in 1989 at 26 wharves along Tokyo Bay. Organotin compounds, other than DPT, were detected in all mussel samples (in case of DPT: 23 of 26). The concentration of DBT was highest among butyltin compounds and that of TPT was highest among phenyltin compounds. The results showed that relatively high concentrations of organotin compounds persist in blue mussels of Tokyo Bay, although the use of the paints containing these compounds has been limited for several years by regulations. 相似文献
12.
H. L. Davies J. B. Keene K. Hashimoto M. Joshima J. E. Stuart D. L. Tiffin 《Geo-Marine Letters》1987,6(4):181-191
The floor of the western Solomon Sea (for new bathymetric map see inside back cover of this issue) is dominated by the arched and ridged basement of the Solomon Sea Basin, the partly-sediment-filled New Britain Trench, and a more completely filled trench, the Trobriand Trough. There is a deep basin where the trenches join (149° Embayment), and a silled basin west of the New Britain Trench (Finsch Deep). Submarine canyons descend from the west and south to the 149° Embayment. Abyssal fans and plains are structurally defined and locally disturbed by young faults. Probable submerged pinnacle reefs stand in water depths as great as 1,200 m. 相似文献
13.
Hashimoto S Kurihara R Strüssmann CA Yamasaki T Soyano K Hara A Shiraishi H Morita M 《Marine pollution bulletin》2003,46(4):459-465
Endocrine disrupting chemicals such as organochlorines have been detected in a large number of marine fish. Histological observation of the gonads, measurement of serum vitellogenin (VTG) level and of liver polychlorinated biphenyl (PCB) content were performed to evaluate the reproductive health and the contamination with endocrine disruptors in bigeye tuna Thunnus obesus, collected in the northern Pacific Ocean in 1999 and 2000. Abnormalities commonly found in species affected by endocrine disruptors such as the presence of oocytes in the testis or elevated serum VTG levels were not found in any of males examined. Both males and females had only small amounts of liver PCB content. The results suggest that currently there is little if any risk of organochlorine contamination or endocrine disruption of gonadal function in bigeye tuna from the northern Pacific Ocean. However, further studies are necessary to evaluate the health status of the open sea fishery resources. 相似文献
14.
Diffuse Emission of CO2 from Showa-Shinzan, Hokkaido, Japan: A Sign of Volcanic Dome Degassing 总被引:1,自引:0,他引:1
Pedro A. Hernández Kenji Notsu Hiromu Okada Toshiya Mori Masanori Sato Francisco Barahona Nemesio M. Pérez 《Pure and Applied Geophysics》2006,163(4):869-881
Two soil CO2 efflux surveys were carried out in September 1999 and June 2002 to study the spatial distribution of diffuse CO2 degassing and estimate the total CO2 output from Showa-Shinzan volcanic dome, Japan. Seventy-six and 81 measurements of CO2 efflux were performed in 1999 and 2002, respectively, covering most of Showa-Shinzan volcano. Soil CO2 efflux data showed a wide range of values up to 552 g m-2 d-1. Carbon isotope signatures of the soil CO2 ranged from -0.9‰ to -30.9‰, suggesting a mixing between different carbon reservoirs. Most of the study area showed CO2 efflux background values during the 1999 and 2002 surveys (B = 8.2 and 4.4 g m-2 d-1, respectively). The spatial distribution of CO2 efflux anomalies for both surveys showed a good correlation with the soil temperature, indicating a similar origin for the
extensive soil degassing generated by condensation processes and fluids discharged by the fumarolic system of Showa-Shinzan.
The total diffuse CO2 output of Showa-Shinzan was estimated to be about 14.0–15.6 t d-1 of CO2 for an area of 0.53 km2. 相似文献
15.
Characteristics and implication of clay minerals in the northern and southern parts of the Chelung-pu fault, Taiwan 总被引:1,自引:0,他引:1
In this study, we report the characteristics of clay minerals present in the Chelung-pu fault in Taiwan. In the 1999 Chi-Chi earthquake, different slip motions were recorded along the Chelung-pu fault in the northern and southern parts of the fault. The characteristics of clay minerals present in the fault zones can be attributed to the differences in motion. We analyzed the shallow drill core samples obtained from the northern and southern sites penetrating the fault. The clay minerals identified in most of the samples from both the sites are smectite, illite, and chlorite. There are illite–smectite mixed layers with a high illite content and no chlorite–smectite mixed layer. In some samples, no smectite is detected. We also examined the iron content and symmetry of iron and magnesium in the silicate and hydroxide layers in chlorite. At the northern site, the total iron content in chlorite of gouge is larger than that of the host rocks. On the other hand, at the southern site, the total iron content varies widely. It is hypothesized that the smectite consumption and differences in the characteristics of chlorite may be controlled by the differences in the lithology, fluid chemistry, fluid temperature, or fault activities (heating or breakage) between the northern and southern sites. 相似文献
16.
Yasuhiro Hashimoto J. Patrick Henry Hans Böhringer 《Monthly notices of the Royal Astronomical Society》2007,380(2):835-838
We investigated the influence of environment on cluster morphology by examining the alignment of the cluster position angle with respect to the nearest neighbour cluster. The cluster position angle and ellipticity were measured using high spatial resolution X-ray data taken from the Chandra archive, while the nearest neighbour sample was extracted from the Abell cluster catalogue. We found high confidence for an alignment when neighbour distance (Dn) was less than 70 h −1 Mpc, while we found no significant variations of the confidence level at various values of Dn less than 70 h −1 Mpc. 相似文献
17.
18.
Aoki Toshiya Katsura Shinya Koi Takashi Tanaka Yasutaka Yamada Takashi 《Landslides》2022,19(8):1813-1824
Landslides - The 2018 Hokkaido Eastern Iburi Earthquake triggered numerous shallow landslides on slopes covered with thick pyroclastic-fall deposits. The landslides occurred more frequently on... 相似文献
19.
A model with rigid rotations and slip deficits for the GPS-derived velocity field in Southwest Japan
We interpret the GPS-derived velocity field in southwest Japan by a superposition of the elastic deformation caused by fault interactions (slips or slip deficits) on the rigid motion of tectonic blocks (or plates). Based on the strain rate field and crustal seismicity, we apply a model with three blocks (Inner Arc, Outer Arc, and the northern Ryukyu block) and slip deficits along the block boundaries.Several characteristics of the synthesized contributions are found:
- (1) Westward motion of the outer arc relative to the Amurian plate and the inner arc,
- (2) southeastward motion of the northern Ryukyu block relative to the Amurian plate,
- (3) 2−4 mm/yr deficits of left lateral slip rates along the boundary at 32°N in southern Kyushu,
- (4) 0−8 mm/yr deficits of right lateral slip rates along the Median Tectonic Line and the Beppu-Shimabara Graben,
- (5) slip deficit rates on the plate interface smaller than those in the case without any consideration for rigid block motions,
- (6) clockwise deflection of slip deficit rate vector on the plate interface from that estimated when not taking rigid block motions into consideration.
Keywords: Oblique subduction; Sliver motion; Backarc spreading; Interplate coupling; Euler vector 相似文献
20.
A simple model of lower trophic level ecosystem has been created to analyze possible environmental control of primary production
in eight sub-areas of the Seto Inland Sea. The primary production rates observed by Hashimotoet al. (1997a) in these sub-areas are well reproduced by the model, including horizontal processes such as horizontal transport
of nutrients and vertical processes such as vertical mixing, light intensity and sinking of particulate matter. Without taking
account of horizontal processes the model also successfully reproduces the observed primary production rates in some areas,
but if fails to reproduce those in the others. This shows that the relative importance of the horizontal transport on the
primary production differs are by area. Two time scales,T
z andT
H, are introduced to explain this difference.T
z is a vertical cycling time of material, which is defined as the time during which the stock of the material in the water
column is utilized for primary production;T
H is the horizontal transit time of the material. The relative importance of the horizontal process is well explained by theT
H/T
z ratio; that is, the horizontal transport process is important in the areas where this ratio is small. Further the possible
mechanisms of nutrient supply for the primary production in each sub-area are investigated using this model. 相似文献