常熟地倾斜观测突跳的深入分析     

杨云  郑江蓉 《地震地磁观测与研究》2006,27(6):80-85

通过对常熟SQ-70石英丝倾斜仪1996~2005年NS向观测出现的几次显著突跳事件进行深入分析,对地震预报实践中给出的判定意见进行了回顾和反思,同时讨论了该仪器年变幅和M2波潮汐因子的变化,对今后的日常地震预报有较好的参考价值。  相似文献   

我国螺旋度的研究及应用   总被引：24，自引：6，他引：18  

岳彩军  寿亦萱  寿绍文  漆梁波  施红 《高原气象》2006,25(4):754-762

对自20世纪90年代以来至今国内关于螺旋度理论及应用研究工作进行了较系统地总结,将螺旋度归类为垂直螺旋度、水平螺旋度及完全螺旋度,同时又将垂直螺旋度划分为局地垂直螺旋度和积分垂直螺旋度,详细介绍并给出了每一类螺旋度的计算表达式以及其在天气诊断分析中的应用状况,对螺旋度的应用研究现状进行了简单地分析与讨论,最后展望了未来螺旋度研究与应用的发展方向。  相似文献   

利用双阳台水管观测资料检测地球自由振荡   总被引：2，自引：2，他引：0  

邓娜  刘冰冰  杨耀文  蒋翠荣  范金梅  任佳 《大地测量与地球动力学》2009,29(Z1):41-44

基于双阳台水管倾斜仪的数字化观测资料,利用功率谱密度估计方法,在没有对资料进行去固体潮处理的情况下,准确获得了2004年12月26日苏门答腊大地震激发的0S3～0S31基频球型自由振荡。并与PREM模型的理论自由振荡周期进行了对比,发现实测振荡周期与PREM预测的振荡周期相吻合,除0S3、0S4振型的观测周期和PREM模型理论周期的相对误差大于0.3%外,其他振型的观测周期和PREM模型理论周期的相对误差大都集中在0.1%左右。同时还检测到了5个谐频球型振荡和8个环型振荡。  相似文献   

巴里坤地震台SQ-70DSi水平摆观测数据干扰分析     

张剑锋  尹海林  高朝军  张嘉敏  段绍鑫  单晓琳  刘青山  张小飞 《地震地磁观测与研究》2022,43(4):115-122

基于2018—2021年巴里坤地震台水平摆观测资料,选取典型受干扰曲线,分析其变化趋势,总结仪器运行中存在的各类干扰因素。研究发现,干扰主要包括自然干扰(降雨、气压、雷击)、人为干扰(进洞巡检、调零标定、仪器维修)、仪器自身故障(数采故障、光源灯故障)等。  相似文献   

应用地震资料设计水平井轨迹     

刘福贵  刘传虎 《地球物理学进展》1993,8(3):122-131

应用三维地震资料设计水平井的轨迹,用人工合成记录标定层位和岩性并进行精细的构造解释和储层横向预测,对测区速度场进行研究,利用Geoquest 人机联作解释系统编绘层拉平图、转弯测线剖面图,不整合面构造图,各套油层顶面构造图,沿地层倾向设计水平井的轨迹.经两口井钻探,钻遇不整合面的误差0.19%—0.39%,一口井平均钻遇油层204m,相当9口直井的效益.用地震资料设计巷道水平井的关键是油层标定、深度标定和确定油层走向,用人机联作系统绘制水平切片图、反射波振幅图、油层顶构造图,设计了在油层内钻探的巷道井.经钻探,钻遇不整合面的误差0.07%,在真厚度8.23m 的油层内钻进563m.  相似文献   

春季高原东侧水平稳定层分析   总被引：1，自引：0，他引：1  

朱光宇  吴宝俊  胡圣昌 《大气科学》1991,15(6):70-77

本文利用稠密的探空资料,分析了春季高原东侧的水平稳定层。确定了该稳定层的范围和强度,指出了其温度、湿度和流场特征,并初步探讨了其维持机制。  相似文献   

Statistics on the vertical structure of rainshowers     

R. R. Rogers  K. J. Keen  M. Blaskovic 《Pure and Applied Geophysics》1983,121(1):167-184

A large sample of summertime data from the McGill Radar Weather Observatory was analyzed to determine the variation with altitude of the horizontal extent of individual rainshowers. For echoes defined by a reflectivity factor of 39 dBz (equivalent to a rainfall rate of about 10 mm/h) it was found that the mean area of the total population of echoes decreases linearly with altitude from approximately 20 km² at 2 km to 11 km² at 8 km. Subsets of the total population were investigated, consisting of only the echoes penetrating the altitudes of 6, 7, and 8 km. On the average these relatively tall echoes are much greater in horizontal extent than the total population. Whereas the sizes of the total population of echoes at any altitude are distributed approximately exponentially in terms of the square root of area, the sizes of the “survivors” that extend to high altitudes may be described by the gamma distribution with a mean value decreasing approximately linearly with height above 3 km and a dispersion of 0.55. Some characteristics are also reported for echoes defined by reflectivities of 31 dBz and 47 dBz. Estimates are given of the fraction of the total area in a horizontal plane that contains echoes in each of these categories.  相似文献   

水平倾斜仪综合监控器的研制     

宋贤志  杜木柯 《东北地震研究》2005,21(1):57-60

针对水平倾斜仪观测过程中存在的问题，研制了综合监控器。本文介绍了综合监控器的功能及工作原理。  相似文献   

Numerical simulation of groundwater flowing to horizontal seepage wells under a river   总被引：6，自引：0，他引：6  

Wei Wang  Ge Zhang 《Hydrogeology Journal》2007,15(6):1211-1220

A horizontal seepage well, consisting of an interconnected vertical well, galleries, chambers and small-diameter radiating bores, is used to acquire relatively clean water that has been filtered through natural alluvial deposits in a riverbed. It has wide application, especially in arid and semi-arid areas. The lack of calculation formulae or models for horizontal seepage wells, up until now, has resulted in several false applications. Based on the analysis of groundwater flow characteristics, it has been concluded that several flow regimes coexist and hydraulic head loss exists in the horizontal seepage well. To avoid the difficulty of confirming the flux or head distribution in such a complex system, the model boundary of the whole horizontal seepage well has been moved to that of just the vertical well, and the well-aquifer system was treated as a heterogeneous medium, where the horizontal seepage well itself is a highly permeability medium. A mathematical model has been developed, based on the coupled seepage-pipe flow, by the introduction of equivalent hydraulic conductivity according to different flow regimes. Then a three-dimensional finite difference numerical model, based on the mathematical model, was developed and applied to a horizontal seepage well in China. The numerical model verified the groundwater flow characteristics of the horizontal seepage well. An erratum to this article can be found at  相似文献   

Influence of the Kunlun Mountain Ms8.1 Earthquake on Horizontal Crustal Deformation in the Sichuan and Yunnan Area     

Yang Guohua 《中国地震研究》2007,21(3):269-280

In order to track the space-time variation of regional strain field holistically(in a large scale) and to describe the regional movement field more objectively,the paper uses a nonlinear continuous strain model focused on extracting medium-low frequency strain information on the basis of a region with no rotation.According to the repeated measurements(1999～2001～2004) from GPS monitoring stations in the Sichuan and Yunnan area obtained by the Project of "China Crust Movement Measuring Network",and with the movement of 1999～2001(stage deformation background) as the basic reference,we separated the main influencing factors of the Kunlun Mountain M-S8.1 earthquake in 2001 from the data of 2001 and 2004,and the results indicate:(1) the Kunlun Mountain M-S8.1 earthquake has a discriminating effect on the Sichuan and Yunnan area,moreover,the deformation mode and background had not only certain similitude but also some diversity;(2) The movement field before the earthquake was very ordinal,while after the earthquake,order and disorder existed simultaneously in the displacement field;The displacement quantities of GPS monitoring stations were generally several millimeters;(3) The principal strain field before earthquake was basically tensile in an approximate EW direction and compressive in the SN direction,and tension was predominant.After the earthquake,the principal strain field in the Sichuan area was compressive in the EW direction and tensile in the SN direction,and the compression was predominant.In the Yunnan area,it was tensional in the NE direction and compressive in the NW direction,and tension was predominant;(4) The surficial strain before the earthquake was dominated by superficial expansion,the contractive area being located basically in the east boundary of Sichuan and Yunnan block and its neighborhood.After the earthquake,the Sichuan area was surface contractive(the further north,the greater it was),and south of it was an area of superficial expansion.Generally speaking,the Kunlun Mountain M-S8.1 earthquake played an active role in the accumulation of energy in the Sichuan and Yunnan area.Special attention shall be focused on the segment of Xichang-Dongchuan and its neighborhood.  相似文献