合肥形变台短水准测量资料趋势及震例分析

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     

Methods of analyzing radio polarization data

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.     

Technologies for analyzing geophysical time Series: Part 1. Software requirements

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.     

A physics-based statistical algorithm for retrieving land surface temperature from AMSR-E passive microwave data

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.     

An improved straight-line fitting method for analyzing pumping test recovery data

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   

A comparison of aeromagnetic levelling techniques with an introduction to median levelling

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.     

畸形参数附带卓越周期拟合法在泾阳短水准资料处理中的应用

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     

跨断层流动形变数据处理软件构建

由于跨断层流动形变数据具有特殊性,其数据处理均为用户自己编制软件进行处理,缺少涵盖跨断层流动形变数据日常处理方法软件。为此,本文基于Windows系统、使用C#语言、MySQL数据库开发研制日常跨断层流动形变数据处理软件,不仅可以存储管理监测场地监测数据,而且具有多种数据包括不等间隔数据预处理、数据处理以及图像与辅助信息编辑输出等功能。该软件将进一步推动跨断层流动形变数据在防震减灾工作中发挥作用。      

A Bayesian hierarchical modeling approach for analyzing observational data from marine ecological studies

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.     

Optimum structures of free levelling traverses

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