应用T-A双重拟合进行多次波压制     

王辉  何兵寿 《物探化探计算技术》1999,21(1):9-13

本文介绍了多项式拟合零炮检距剖面的方法、原理,并提出了一种新的拟合方法,即时间—振幅双重拟合法（Ｔｉｍｅ－ＡｍｐｌｉｔｕｄｅＤｕａｌＦｉｔｉｎｇＭｅｔｈｏｄ）,用于地震波组的提纯和多次波的压制,并将其与其他多次波的压制方法进行了对比  相似文献   

地电仪工作可靠性和抗干扰的研究          下载免费PDF全文

谭大诚  苏明达  张世中  侯远文  宋宝昌 《地震工程学报》2000,22(2):177-181

自动化的地电观测仪器在观测过程中 ,因受干扰有时会造成死机或复位等现象 ,使观测过程不能顺利进行 .导致仪器不能可靠运行的原因中 ,电源的干扰和强电磁场的干扰是很重要的因素 .增强仪器电源部分的抗干扰能力以及在电路中采用软、硬件的抗干扰措施能较明显地增强仪器的抗干扰能力 ,提高其工作可靠性 .  相似文献   

电磁脉冲干扰的识别及异常特征   总被引：3，自引：0，他引：3  

阎计明 《山西地震》2000,(3):22-25

分析了全国７个省区电磁观测台站近２０次地震前的记录资料,研究了震前电磁波异常的产生机理,提出了识别干扰的方法,总结了震前电磁波异常的一些主要特征。  相似文献   

豫01井水位动态趋势下降因素探讨     

郭德科  刘振江  任俊武 《山西地震》2000,(4):28-31

探讨了河南范县豫０１井水位自１９９６年９月份以来持续下降的原因,对有可能影响该井水位动态的诸多因素逐一进行了对比分析和研究,认为范县豫０１井自１９９６年９月至今的水位下降与中原油田抽水、注水、采油无关;而当地降雨降荷载效应外没有短期渗流反映;山西长治一带降雨量变化与豫０１井的水位变化基本无关;山东梁册县９７井水位动态与豫０１井水位动太县有较好的一致性,表明山东梁山是豫０１井地下水的补级源,指出该井１９９６年９月至今的水位趋势下降主要是１９９７年干旱、降雨量减少,地下水不能充分地补给所致,亦可能与近年来范地区地壳应力活动增强有关。  相似文献   

考虑土与结构相互作用效应的结构减震控制大型振动台模型试验研究   总被引：7，自引：3，他引：7  

陈国兴  王志华  宰金珉 《地震工程与工程振动》2001,(4)

本文设计并完成了考虑土与结构相互作用的结构减震控制大型振动台模型试验。通过对四种结构形式的对比试验，探讨了土与结构相互作用（ＳＳＩ）效应对结构地震反应的影响以及调谐质量阻尼器（ＴＭＤ）在刚性和柔性地基条件下对主体结构的减震效应。通过比较同一地震动作用下主体结构在刚性和柔性两种地基条件下的地震反应，可知：ＳＳＩ效应具有降低和提高结构减震控制效果的双重作用，其综合效果与输入地震动的频谱特性、加速度峰值大小有关。由于ＳＳＩ效应在结构地震反应中发挥着双重的作用，因而使得基于刚性地基假定下设计的ＴＭＤ减震控制系统在柔性地基条件下的控制效果不太理想，甚至会出现负面效应。本文还探讨了在柔性地基条件下影响结构减震控制效果的一些因素。  相似文献   

河北涿鹿矾山水氡映震能力探讨     

张晓曦  张启富  路汉荣  郑捷  崇立辉 《山西地震》2006,(3):21-25,48

介绍了河北涿鹿矾山泉所处的地质构造环境、水文地质条件和水质类型等,对该泉近30年来的原始水氡观测数据进行了处理,对矾山水氡的干扰因素及映震能力进行了分析。结果表明:自1975年水氡观测以来,水氡一直保持夏高冬低的规律,虽因季节性排水有一定影响,但年变形态受干扰较小,在唐山7.8级地震和张家口地区个别中等地震前有一定异常反映,但对20世纪80年代后发生在张家口地区及邻近区域的中强地震反映不明显。  相似文献   

新疆DSJ型水平断层活动测量仪年变规律的研究     

张毅光  张瑞云 《内陆地震》1998,12(2):142-146

通过对新疆ＤＳＪ型水平断层活动测量仪观测资料进行分析,发现它们具有共同的年周期变化规律。这种年周期变化主要是由水平断层仪所跨岩体的热胀冷缩造成。采用“动态灰箱模型”可消除这种因温度而造成的年周期变化,从而突出地震前兆异常,为地震预报提供可靠的科学依据  相似文献   

影响酸解烃浓度的因素及排除干扰的方法   总被引：3，自引：2，他引：3  

李兰杰 《物探与化探》2004,28(2):126-129

根据在鄂尔多斯盆地油气化探工作中的研究认为,影响酸解烃浓度的主要因素为地形地貌、岩性、碳酸盐含量及地层等。摸索出的排除和抑制这些干扰因素的方法在实践中取得了较好的效果。  相似文献   

Analysis of Power Supply Interference of Geomagnetic Second Data Observation-Take Changli Seismic Station as An Example     

TONG Xin  ZHOU Jianqing  LIU Zhe  ZHANG Guoling  GUO Jianfang 《中国地震研究》2020,34(2):240-254

This paper analyzes two types of power supply interference encountered in the observation of geomagnetic second data:the HVDC interference and the discharge interference of electrified railway. By taking the FGM fluxgate magnetometer of Changli Seismic Station as the research object, we analyze interference characteristics and conduct intensive observational experiment of electrified railway interference. Finally, several conclusions are obtained:① HVDC interference is closely related to the changes in the current system of the interference source, such as current size, distance or orientation of the interference source. Although the characteristics of each change are not the same, the main changes are variable. ② The discharge phenomenon caused by the contact of the pantograph system or other reasons during the operation of the electrified railway is a factor that may cause random small interference in the geomagnetic second data at Changli Seismic Station. This study explains similar phenomena discovered in previous years and meanwhile correct previous misjudgments including unstable working systems, unstable power supply, and occasional sudden jumps that are considered to be discrete.  相似文献   

3D numerical modeling of forward folding and reverse unfolding of a viscous single-layer: Implications for the formation of folds and fold patterns   总被引：1，自引：0，他引：1  

Stefan M. Schmalholz   《Tectonophysics》2008,446(1-4):31-41

The main aims of this study are to show (i) that non-cylindrical three-dimensional (3D) fold shapes and patterns can form during a single, unidirectional shortening event and (ii) that numerical reverse modeling of 3D folding is a feasible method to reconstruct the formation of 3D buckle-folds. 3D viscous (Newtonian) single-layer folding is numerically simulated with the finite element method to investigate the formation of fold shapes during one shortening event. An initially flat layer rests on a matrix with smaller viscosity and is shortened in one direction parallel to the layering. Forward modeling with different initial geometrical perturbations on the flat layer and different lateral boundary conditions generates non-cylindrical 3D fold shapes and patterns. The simulations show that, in reality, the initial layer geometry and the boundary conditions strongly control the final fold geometry. Fold geometries produced from the forward folding models are used as initial setting in numerical reverse folding models with parameters identical to those of forward models. These reverse models accurately reconstruct the initial geometry of forward models with also only one extension event parallel to the previous shortening direction. The starting geometry of the forward models is inaccurately reconstructed by the reverse models if a significantly different viscosity ratio than in the forward models is used. This work demonstrates that reverse modeling has a high potential for reconstructing the deformation history of folded regions and rheological constraints such as viscosity ratio. Reverse models may be applied to natural 3D fold shapes and patterns in order to determine if they formed (i) during a single or multiple deformation events and (ii) as active buckle-folds with a viscosity ratio 1 or as passive, kinematic folds without buckling. This approach may find much application to fold interference patterns, in particular.  相似文献