共查询到11条相似文献,搜索用时 46 毫秒
1.
合肥形变台短水准测量资料趋势及震例分析 总被引:1,自引:0,他引:1
前言 合肥形变台位于安徽省肥东县桥头集。测量场地所在区域是我国东部一个特殊的构造部位,处于新华夏系第二隆起带和秦岭纬向构造带,淮阳山字形东翼弧的复合部位,也是华北、华南两个地史发展特点不同的构造单元的接壤过渡地带。在区域应力场作用下断层发 相似文献
2.
Marita Krause 《地球物理与天体物理流体动力学》2013,107(1-3):23-26
Abstract Methods of estimating the strength and direction of galactic magnetic fields from radio polarization measurements are reviewed. Particular attention is paid to the analysis of the Faraday rotation in order to derive the large scale magnetic field structure. Ways in which an axisymmetric spiral field structure can be observationally distinguished from a bisymmetric spiral structure are described, as are the ways in which field symmetric with respect to the galactic plane can be distinguished from those that are antisymmetric. 相似文献
3.
A. V. Desherevskii V. I. Zhuravlev A. N. Nikolsky A. Ya. Sidorin 《Seismic Instruments》2017,53(1):46-59
Time series of geophysical monitoring data are very specific. They can contain complicated irregular variations and nonstationary effects of various kinds. Time-varying noise, numerous gaps in the data, trends, technical drawbacks, and other hardly predictable features are often present in these time series. These peculiarities demand special methods and procedures for acquisition and analysis of the data. The first part of the paper discusses the peculiarities of the software for such time series, and a brief review of the methods for solving the task is given. In the second part of the paper, the universal software package WinABD developed by the authors for multivariable analysis of geophysical time series will be described. The technologies realized in the software package and intended for analysis of similar signals will be considered. 相似文献
4.
A physics-based statistical algorithm for retrieving land surface temperature from AMSR-E passive microwave data 总被引:5,自引:0,他引:5
Mao KeBiao Shi JianCheng Li ZhaoLiang Qin ZhiHao Li ManChun Xu Bin 《中国科学D辑(英文版)》2007,50(7):1115-1120
AMSR-E and MODIS are two EOS (Earth Observing System) instruments on board the Aqua satellite. A regression analysis between the brightness of all AMSR-E bands and the MODIS land surface tem-perature product indicated that the 89 GHz vertical polarization is the best single band to retrieve land surface temperature. According to simulation analysis with AIEM,the difference of different frequen-cies can eliminate the influence of water in soil and atmosphere,and also the surface roughness partly. The analysis results indicate that the radiation mechanism of surface covered snow is different from others. In order to retrieve land surface temperature more accurately,the land surface should be at least classified into three types:water covered surface,snow covered surface,and non-water and non-snow covered land surface. In order to improve the practicality and accuracy of the algorithm,we built different equations for different ranges of temperature. The average land surface temperature er-ror is about 2―3℃ relative to the MODIS LST product. 相似文献
5.
Theis (1935) derived an exact solution for the residual drawdown in a well after the cessation of a pumping test by summing two drawdowns: one (s1), caused by imaginary continuation of the original pumping and the other (s2), due to an imaginary injection at the same constant rate. We approximated the Theis solution to obtain a simple linear relation for determining the transmissivity and storage coefficient from recovery data. Unlike other existing straight-line fitting methods, in our method, we applied different approximations to the well functions in the solutions of s1 and s2. We used the well-known Cooper-Jacob approximation for s1, truncating the expansion of the well function in s2 to its first three terms. For the same level of truncation errors, while the Cooper-Jacob approximation requires the argument u1相似文献
6.
Aeromagnetic data collected in areas with severe diurnal magnetic variations (auroral zones) are difficult to level. This paper describes levelling of an aeromagnetic survey where such conditions prevail, and where sophisticated levelling techniques are needed. Corrections based on piecewise low‐order polynomial functions are often used to minimize mis‐ties in aeromagnetic data. We review this technique and describe similar mis‐tie fitting methods based on low‐pass filter levelling, tensioned B‐spline levelling and median levelling. It is demonstrated that polynomial levelling, low‐pass filter levelling and tensioned B‐spline levelling depend on the careful editing of outlying mis‐ties to avoid the introduction of false anomalies. These three techniques are equally efficient at removing level errors. Median levelling also removes level errors efficiently, but it is more robust in the sense that mis‐tie editing is not required. This is due to the inherent noise‐removal capabilities of the median filter. After mis‐tie editing, the total field anomalies of the other three techniques closely resemble the unedited median‐levelled total field anomaly. 相似文献
7.
应用畸形参数附带卓越周期拟合法 ,结合其他跨断层形变资料处理方法 ,处理了泾阳短水准资料 ,提取具有定量性质的形变异常特征 ,较好地反映了泾阳 ML 5.2地震前兆信息。且震前形变异常存在着以 3为倍数的韵律特征 相似文献
8.
A Bayesian hierarchical modeling approach for analyzing observational data from marine ecological studies 总被引:1,自引:0,他引:1
Song S. Qian J. Kevin Craig Melissa M. Baustian Nancy N. Rabalais 《Marine pollution bulletin》2009,(12):1916-1921
We introduce the Bayesian hierarchical modeling approach for analyzing observational data from marine ecological studies using a data set intended for inference on the effects of bottom-water hypoxia on macrobenthic communities in the northern Gulf of Mexico off the coast of Louisiana, USA. We illustrate (1) the process of developing a model, (2) the use of the hierarchical model results for statistical inference through innovative graphical presentation, and (3) a comparison to the conventional linear modeling approach (ANOVA). Our results indicate that the Bayesian hierarchical approach is better able to detect a “treatment” effect than classical ANOVA while avoiding several arbitrary assumptions necessary for linear models, and is also more easily interpreted when presented graphically. These results suggest that the hierarchical modeling approach is a better alternative than conventional linear models and should be considered for the analysis of observational field data from marine systems. 相似文献
9.
10.
Lubomír Kubáček Lea Bartalošová Ján Pecár Reviewer F. Charamza 《Studia Geophysica et Geodaetica》1978,22(1):1-12
Summary Given a configuration of points of a levelling traverse, it is possible to determine their heights according to various plans by applying various optimization criteria. D-, restricted D-and L-optimum plans for various configurations are generally treated. Of two plans belonging to one and the same configuration we consider the one whose determinant, or trace of the covariance matrix of adjusted heights is minimum, to be optimal.Dedicated to RNDr Jan Pícha, CSc., on his 60th Birthday 相似文献
11.
On the procedure of astro-gravimetric levelling 总被引:1,自引:0,他引:1
O. M. Ostach 《Studia Geophysica et Geodaetica》1970,14(2):222-225