共查询到20条相似文献，搜索用时 62 毫秒
1.
分析嘉山地震台自2007年运行以来的大地电场观测资料,并对数据的变化特征进行研究,总结分析部分干扰引起的电场变化的曲线特征,给出不同影响因素导致的曲线异常变化情况,为大地电场干扰排除提供依据. 相似文献
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砌体结构抗震抗剪强度分析 总被引：9，自引：0，他引：9
进行了墙体抗剪强度理论和公式的研究。将主拉强度理论与剪摩强理论相结合,形成了一种新和强度理论,即拉摩强度理论。根据该理论,导出了墙体抗剪强度公式。给出了公式系数的确定方法,并确定了砖墙体的公式系数。将本文建议的砖墙体抗剪强度公式与抗震和砌体规范采用的抗剪强度公式进行了比较,比较结果表明：抗震规范公式值较小;砌体规范公式值较在,本文公式值介于两者中间。 相似文献
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A. Ya. Sidorin 《Seismic Instruments》2014,50(3):246-267
The features of the diurnal periodicity of earthquakes with different energies in Japan are studied. The spatiotemporal parameters of different earthquake sets are investigated in detail using various techniques including analyses of amplitudes, dispersion, spectra and correlation. The phases of seismic flows are studied using the modified Rayleigh-Schuster method. Lomb-Scargle periodograms are used to study the frequency of variations in seismicity. The parameters of the sets of earthquakes having different energies obtained in this study indicate changes in phase of the diurnal periodicity of earthquakes to the opposite near the magnitude of completeness. The very clear midday effect is noted. 相似文献
4.
The results of geochemical studies of water composition in an oligotrophic bog are analyzed. The specific features of the formation of the bog water composition in various phytocenoses are shown. The amounts of elements carried out with the runoff from the oligotrophic bog are assessed. 相似文献
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V. V. Adushkin A. A. Spivak V. A. Kharlamov 《Izvestiya Physics of the Solid Earth》2014,50(2):215-221
The instrumental observations of geomagnetic variations in the middle latitudes are analyzed. The main periodicities are revealed in the background local variations of the magnetic field of the Earth. Besides the 27–29-day variations, which are associated with the rotation of the Sun around its axis, also the harmonic components with periods of ～1, 6–8, 13–14, 57–60 days, and about a year are identified. It is shown that the periodicities in the background variations are both regular and sporadic. The peculiarities in the time behavior of some spectral components of geomagnetic variations are established. 相似文献
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S. A. Matsievskii 《Seismic Instruments》2012,48(3):222-225
Some trends of modern instrumental developments in seismometry are analyzed. The brief characteristic of galvanometric registration is given. The methods and tools of construction of a modern electron seismometer are reviewed. The main difficulties in construction of an ultra-long period laboratory seismometer for the teleseismic observations are discussed. The main instrumental task of seismometry is related to the extension of the dynamic interval of registered amplitudes. The general peculiarities typical of all modern seismometers are enumerated. 相似文献
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The formation conditions of water exchange and quality in a lake used as a part of water disposal system of an operating copper-nickel metallurgical plant are considered. Water and material budget of the lake is calculated, including process water discharge, atmospheric precipitation, and snow melting. The quantitative and qualitative characteristics of bottom sediments and waters involved in lake water exchange are determined. The migration conditions of heavy metals from bottom sediments are evaluated and their dynamic layers are determined. Some measures are proposed for reducing the adverse impact of the coppernickel plant on water bodies. 相似文献
9.
应用定西地区的陆面过程野外观测资料和四次EOS_MODIS卫星资料,对典型的西北半干旱雨养农业区的基本地表特征参数进行反演,在此基础上对各能量通量和蒸散量进行估算,进而分别分析其季节和空间变化.结果表明：应用卫星数据估算的各参量的相对误差基本都在20%以内,其空间和时间变化基本反映了当地的实际情况;区域各通量和日蒸散量分布极不均匀,表现为四季相差比较大的单峰型变化特征,冬季最小、其次是秋季、夏春两季最大;与面积较大的中、低植被覆盖度区域相比,小范围的高植被覆盖度区域的地表净辐射、潜热和日蒸散量相对较高,土壤热通量和显热通量相对较低,并且都在春、夏季节表现得更加显著.低、中植被覆盖度区的各能量通量的季节变化不显著的特征反映了半干旱西北雨养农业区土壤的干土层相对比较厚的特征. 相似文献
10.
D. V. Abramov M. N. Drobyshev V. N. Koneshov 《Izvestiya Physics of the Solid Earth》2013,49(4):548-553
Continuous high-precision long-term gravity measurements are carried out at the geophysical observatory located in the experimental base of Vladimir State University. The long time series of gravity acceleration and its standard deviation are obtained. The factors responsible for the increases in the studied deviations are analyzed. The recommendations for improving the accuracy of relative gravity measurements are formulated. 相似文献
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H. Dufumier 《Pure and Applied Geophysics》1996,147(3):467-482
The limits of linear moment-tensor inversions from long-period teleseismic body waves are analysed in detail, using inverse methods. We focus our attention on single-station and few-stations methods. Information on the feasibility of full or deviatoric moment-tensor determinations prior to inversion are deduced from the system conditioning. The resolution and correlation of the momenttensor components are analysed using the resolution matrix. Conclusions on the importance and independence of the data are drawn from the information matrix. The single--station case and its implications are discussed in greater detail, as well as possible constraints on the inversion. 相似文献
13.
气候变化对湖库水环境的潜在影响研究进展 总被引：4，自引：3，他引：1
本文着重归纳气候变化对湖库热力特性、冰期、溶解氧、营养盐、浮游植物和水生植物等方面的影响规律,探讨气候变化对湖库水环境潜在影响的区域差异,讨论现有研究方法的优缺点和发展前景.研究表明,气候变暖对湖库物理过程的影响最为显著;热带草原气候和温带海洋性气候对于气候变暖和降雨变化的响应较其他气候类型突出;气候变化对湖库水环境的影响效果具有两面性.通过分析各气候类型中气候变暖对磷水平的潜在影响差异表明,亚热带季风气候的湖库更可能受气候变暖的影响趋于富营养状态.在今后研究中,建议深入开展各气候类型中区域性气候变化对湖库水环境影响的实例研究. 相似文献
14.
The problems of correcting gravity tidal observations and indicating of the gravity anomalies used in earthquake prediction in China are systematically studied in this paper. The correcting problems of the rheological model of the instrument, inertia of the earth and the effects of the ocean loading, air pressure, underground water on gravity tidal recording data are also discussed in details, the related results are also given in the paper. The problem of the indicating non-tidal information in stational gravity data is dicussed. The properties of the several different data processing filters are compared in theoretical point of view. 相似文献
15.
Rockbursts are minor earthquakes induced due to mining operations. The seismic signals recorded using geophones in the near
field are generally saturated and are not suitable for estimating the true magnitudes. The strong-motion accelerograms recorded
due to rockbursts are therefore used to obtain the Wood-Anderson synthetic seismograms for getting accurate and reliable values
of the local magnitudes. Using several typical strong-motion accelerograms of rockbursts in the mines of Kolar Gold Fields,
the magnitudes have been computed in the present study. Correlations of peak ground acceleration and peak ground velocity
with the magnitude, studied for the rockbursts vis-à-vis the natural earthquakes in the Koyna dam area, suggest the mechanical
similarity between the two different types of events. The results and findings are described in this paper. 相似文献
16.
The results of studying the elemental composition of surface continental waters in the European Russia from tundra to arid zone are discussed. The relative concentrations of elements in the solid residue of waters from various natural-climatic zones are evaluated, and the enrichment or dispersion of continental waters by these elements are analyzed as compared with their clarkes in the rocks that occur in the catchment areas. The coefficients of migration in water are evaluated, and the major elements with respect to which surface waters enrich under anthropogenic load are identified. The territorial distribution of higher concentrations of the most hazardous elements in waters of lakes is characterized. 相似文献
17.
甘肃省地震台网监测能力分析 总被引：1，自引：1，他引：1
何少林 《地震地磁观测与研究》2003,24(6):103-108
讨论了影响台网监测能力的因素，通过对2000年6月～2003年1月甘肃省地震台网产出的地震目录进行分析，给出了甘肃省地震台网监测能力，对台网监测能力弱区进行了划分，提出提高台网监测能力的建议。 相似文献
18.
地震作用下储罐与管道连接波纹管的动力响应 总被引：2，自引：2，他引：2
针对储罐与管道连接这个抗震薄弱环节进行研究，考虑了储罐与地基、管道与地基的相互弹性作用及流固耦合作用，使计算模型比较符合工程实际情况。将储罐罐壁看作为刚体，将波纹管部分和管道部分分别用旋转锥壳单元和空间梁单元离散化，通过分析得到波纹管与储罐连接接合面、波纹管与管道连接接合面不同单元之间的位移协调约束方程，并用罚函数法进行处理。根据流体力学速度势理论和有限元法的基本理论，利用哈密尔顿变分原理推导出储罐与管道连接波纹管系统动力分析方程，编制了系统动力分析有限元程序，计算了垂直地震激励不同场地土地基条件下储罐与管道连接波纹管位移响应。 相似文献
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The use of water resources of the Novosibirsk Reservoir by the existing water management complex is analyzed at different stages of reservoir operation. The natural and anthropogenic factors that determine the development of reservoir water resources for water supply, a priority objective now, are discussed. The problems of water quality formation in the reservoir are considered for different hydrological seasons and periods of water abundance in the major river. The major contradictions between the participants of water management system are specified. Perspective approaches for optimizing the use of water resources of the reservoir are proposed. 相似文献