ELEMENTAL CONCENTRATIONS IN NINE NEW JAPANESE ROCK REFERENCE SAMPLES     

Shigeru TERASHIMA  Atsushi ANDO 《Geostandards and Geoanalytical Research》1987,11(1):75-77

Twenty-eight major, minor and trace elements in nine new rock reference samples of Geological Survey of Japan (GSJ), JA-2, JA-3 JB-1a, JG-1a, JG-2, JG-3, JF-1, JF-2 and JP-1 have been determined using atomic absorption spectrometry, flame emission spectrometry and wet chemical techniques.  相似文献   

Multicomponent observation of crustal activity in the DPRI 800 m borehole close to the Nojima Fault   总被引：1，自引：0，他引：1  

Hiroshi Ishii  Atsushi Mukai  Kunio Fujimori  Shigeru Nakao  Shigeo Matsumoto  Yasuhiro Hirata 《Island Arc》2001,10(3-4):282-287

Abstract An 800 m borehole was drilled near the Nojima Fault, on which a strike–slip larger then 1 m occurred during the 1995 Hyogo-ken Nanbu earthquake ( M = 7.2). Crustal activity near the fault has been observed since May 1996 using a multicomponent instrument installed at the bottom of the borehole. Data of three components of strain, two components of tilt and temperature observed from May 1996 to December 1998 were analyzed. Long-term changes of strain and tilt show a north-east–south-west extension and southwards subsidence. As for the Earth tides and atmospheric effect, orientation of the principal axis of strain was mainly east-west and orientation of the maximum subsidence was mainly north-south. The observational data of strain had variations corresponding to a change in temperature at a depth of 800 m. The thermal expansion coefficient of the crust was calculated to be approximately 2.0 × 10⁻⁶/°K.  相似文献   

Evaluation of Seasonal Sea Level Variation at Syowa Station, Antarctica, Using GPS Observations     

Shigeru Aoki  Kazuo Shibuya  Akihiro Masuyama  Taku Ozawa  Koichiro Doi 《Journal of Oceanography》2002,58(3):519-523

Global Positioning System (GPS) measurements of the vertical displacement of fast ice near Syowa Station, Antarctica, were conducted between April and December 1998 to evaluate measurements of sea level variation derived with a conventional bottom pressure gauge (BPG). The BPG-derived sea level revealed a seasonal variation of about 0.13 m, with a high in April–June and a low in November–December. The GPS-derived sea level, combined with observed sea ice thickness, supported the BPG result, with an RMS error of 0.007 m. Our result also demonstrates that GPS is a powerful technique for monitoring sea level variations. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

海洋底栖甲藻的浮游行为特征研究   总被引：2，自引：0，他引：2  

黄凌风  郭丰  门谷茂  李少菁 《海洋科学》2001,25(10):8-11

研究了日本濑户内海屋岛湾沙质海滩底栖甲藻中具有底栖－浮游兼性行为的种类及其浮游行为特征。发现具有游游兼性特征的有8种，分别是Amphidinium carterae,A.klebsii,A.herdmanae,Gymnodinium sp1,G.pyrenoidosum,Peridinium quinquecorne,Prorocentrum emarginatum和Pror.sp1,几乎全是该潮间带底栖甲藻的优势种，占水样中甲藻种数的11．6％，个体数占海水样品中甲藻总个体密度的0－51．3％，具有明显的季节性，当这些种类在沉积物样品中数量较少时，在海水样品中就极少出现，具有随潮汐变化的行为特征。研究表明这些种类是真底栖种，浮游生活只是其兼性行为特征，是长期进化和对潮间带特殊环境适应的结果，本文还探讨了底栖甲藻的浮游习性及其与内湾近岩赤潮的关系和可能产生的影响。  相似文献   

Some characteristic features of large amorphous particles (NUTA) in the seto Inland Sea,Japan     

Shigeru Montani  Yasufumi Mishima  Tomotoshi Okaich 《Journal of Oceanography》1991,47(6):276-285

Large amorphous aggregates (NUTA) observed in coastal areas after spring and autumn phytoplankton blooms and red tide outbreaks were collected using NUTA traps which we devised. These particles become thickly attached to mooring ropes and/or fishing nets. The variation of the collection of materials by NUTA traps was about 23% in organic carbon and 25% in organic nitrogen (n=29). The chemical nature and vertical distribution pattern of NUTA were significantly different from those of suspended particles collected by water samplers. Since C/ATP and C/Chlα ratios in NUTA were very high compared with those of suspended particles, NUTA seems to consist of a small amount of phytoplankton but much detritus. These values suggest that NUTA has characteristics intermediate between suspended particles and sinking particles. The standing stock of NUTA was also estimated to be no more than 10% suspended particles from a calculation of the trapping efficiency of the NUTA trap.  相似文献   

Solubility of sulfur in some magmas at 1 atmosphere     

Takashi Katsura  Shigeru Nagashima 《Geochimica et cosmochimica acta》1974,38(4):517-531

In order to understand the distribution of sulfur in igneous rooks, we determined the solubility of sulfur in volcanic rock melts (tholeiite basalt, hawaiite and rhyodacite from Hawaii) at various gas compositions and at 1250° and 1300°C and 1 atm total pressure. The solubility of sulfur in the melt passes through a minimum with change in oxygen partial pressure, if other factors are held constant. For the basaltic liquid at 1200°C, most sulfur in the melt is as dissolved sulfide (S^?2) at oxygen partial pressures below 10^?8 atm and as dissolved sulfate at oxygen partial pressures above 10^?8 atm. Based on the present solubility data, 5 per cent is inferred for volcanic gas at 1 atm total pressure in equilibrium with subaerially extruded Hawaiian tholeiite basalt (Pele's hair with 180 ppm S) at 1200°C and 10^?8 atm P_O2.  相似文献   

Observations of the total lunar eclipse on March 24, 1978, at 3.4-mm wavelength     

Yasuo Fukui  Shigeru Hata  Takeshi Miyaji  Yoshihiro Chikada 《Icarus》1979,40(2):309-314

Observations of the total lunar eclipse were made at 3.4-mm wavelength (87.4 GHz) on March 24, 1978. Eclipsr cooling curves with the best S/N ratio among those published thus far were obtained for the three points (the mountain area near the crater of Hipparuchus, Sinus Medii, and Copernicus). Each of the curves can be decomposed into the three parts which apparently correspond to ingress, totality, and egress. The derived cooling rate and heating rate differ significantly at the three points.  相似文献   

Fragility curves of concrete bridges retrofitted by column jacketing   总被引：1，自引：0，他引：1  

Masanobu Shinozuka  Sang-Hoon Kim  Shigeru Kushiyama  Jin-Hak Yi 《地震工程与工程振动(英文版)》2002,1(2):195-205

The Northridge earthquake inflicted various levels of damage upon a large number of Caltrans’ bridges not retrofitted by column jacketing. In this respect, this study represents results of fragility curve development for two (2) sample bridges typical in southern California, strengthened for seismic retrofit by means of steel jacketing of bridge columns. Monte Carlo simulation is performed to study nonlinear dynamic responses of the bridges before and after column retrofit. Fragility curves in this study are represented by lognormal distribution functions with two parameters and developed as a function of PGA. The sixty (60) ground acceleration time histories for the Los Angeles area developed for the Federal Emergency Management Agcncy (FEMA) SAC (SEAOC-ATC-CUREe) steel project are used for the dynamic analysis of the bridges. The improvement in the fragility with steel jacketing is quantified by comparing fragility curves of the bridge before and after column retrofit. In this first attempt to formulate the problem of fragility enhancement, the quantification is made by comparing the median values of the fragility curves before and after the retrofit. Under the hypothesis that this quantification also applies to empirical fragility curves developed on the basis of Northridge earthquake damage, the enhanced version of the empirical curves is developed for the ensuing analysis to determine the enhancement of transportation network performance due to the retrofit. Supported by: MCEER/FHWA under Contract No.DTFH 61-98-C-00094 and Caltrans under Contract No.59A0304  相似文献   

Post Tectonic Granites in Sri Lanka     

W.I. Starin Fernando  Shigeru Iizumi  R. Kitagawa 《Gondwana Research》1999,2(2):290

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Geological relationship between Anyui Metamorphic Complex and Samarka terrane,Far East Russia     

Satoru Kojima  Kazuhiro Tsukada  Shigeru Otoh  Satoshi Yamakita  Masayuki Ehiro  Cheikhna Dia  Galina Leontievna Kirillova  Vladimir Akimovich Dymovich  Lyudmila Petrovna Eichwald 《Island Arc》2008,17(4):502-516

The Anyui Metamorphic Complex (AMC) of Cretaceous age is composed of metachert, schist, gneiss, migmatite and ultramafic rocks, and forms a dome structure within the northernmost part of the Jurassic accretionary complex of the Samarka terrane. The two adjacent geological units are bounded by a fault, but the gradual changes of grain size and crystallinity index of quartz in chert and metachert of the Samarka terrane and the AMC, together with the gradual lithological change, indicate that at least parts of the AMC are metamorphic equivalents of the Samarka rocks. Radiolarian fossils from siliceous mudstone of the Samarka terrane indicates Tithonian age (uppermost Jurassic), and hence, form a slightly later accretion. This signifies that the accretionary complex in the study area is one of the youngest tectonostratigraphic units of the Samarka terrane. The relationship between the Samarka terrane and AMC, as well as their ages and lithologies, are similar to those of the Tamba–Mino–Ashio terrane and Ryoke Metamorphic Complex in southwest Japan. In both areas the lower (younger) part of the Jurassic accretionary complexes were intruded and metamorphosed by Late Cretaceous granitic magma. Crustal development of the Pacific‐type orogen has been achieved by the cycle of: (i) accretion of oceanic materials and turbidites derived from the continent; and (ii) granitic intrusion by the next subduction and accretion events, accompanied by formation of high T/P metamorphic complexes.  相似文献