The Ocean Loading Effect in the GPS Analysis: A Case Study in the Antarctic Peninsula Region     

R. Dach  R. Dietrich 《Marine Geodesy》2013,36(1):13-25

The accuracy of GPS data analysis for the vertical component has reached a level where the vertical crustal deformation due to the ocean tidal loading should be taken into consideration. Ocean loading affects in particular the results of the GPS analysis for those observation sets covering less than 24 hours. Especially in these cases, a correction for this phenomenon should be performed during the data analysis. On the other hand, it is possible to estimate the ocean loading effect from GPS data sets. In this way it is possible to validate models for the loading deformation derived from global ocean tide models.  相似文献   

福建4级地震前地下水位固体潮加卸载响应比研究     

张清秀  陈莹  陈懿德  郑小菁  王林  陈彩虹 《内陆地震》2013,(3):212-221

根据加卸载响应比理论,对福建省5个水位观测资料进行加卸载响应比计算,发现在多次福建4级地震前出现多井同步异常,在形态上表现为高值突跳,时间上表现为短期或短临异常,空间上与地震所处的构造部位有关.说明地震前近源区含水层系统确实处于临近失稳状态,水位固体潮加卸载响应比可能捕捉到4级以上地震前应力失稳的过程.  相似文献   

水管倾斜仪与摆式倾斜仪抗干扰能力分析   总被引：1，自引：0，他引：1  

熊先保  林立峰  杨婕 《华南地震》2013,33(2)

在理论上对负荷引起的干扰大小进行了定量计算,并结合观测实际,对水管倾斜仪与摆式倾斜仪的抗干扰能力进行了分析.结果表明:同样的干扰源对摆式倾斜仪的干扰要大于水管倾斜仪的,同样的孕震信息也易于被摆式倾斜仪接收到.  相似文献   

Simple shear testing for the study of the earthquake response of clay from the Israeli continental slope     

S. Frydman  M. Talesnick  G. Almagor  G. Wiseman 《Marine Georesources & Geotechnology》2013,31(3):143-171

Abstract

A study was carried out to investigate the simple shear behaviour of a clay from the Israeli continental slope, and to consider the relevance of this behaviour to the stability of the slopes during earthquake conditions. Norweigian simple shear apparatus was modified in order to enable both static and cyclic shearing of undisturbed samples taken from the slope.

Static tests performed on virgin samples and on samples which had undergone extensive cycling indicated similar static strengths, despite development of large cyclic shear strains during cycling. This suggests that the stability of the slopes following completion of an earthquake would not be significantly less than it was before the onset of the earthquake; the critical period for instability would be during the earthquake.

The results of the cyclic tests indicated that shear strain development accelerated once the cyclic strain reached the order of 3%. A failure criterion for the clay, relevant to cyclic loading conditions, was developed, based on this strain value, and was incorporated into a cumulative damage type of analysis for earthquake loading, using Miner's rule. This analysis was used to develop a computer program for the stability analysis of the continental slope during any given earthquake.  相似文献   

伽师强震群活动过程中喀什台地磁加卸载响应比变化特征研究     

史勇军  孙燕萍  朱燕  范素琴  巴克·买买提  热汗古·衣明克力木 《内陆地震》2002,16(1):84-88

应用地磁响应比方法 ,分析计算了喀什地磁台 1996— 1999年地磁资料 ,结果表明在伽师强震前地磁场有明显的异常 ,这为震磁信息提取和异常判断提供了依据  相似文献   

不同地球模型和数值方法对重力负荷效应计算的影响          下载免费PDF全文

李瑞浩  江先华 《地球物理学报》1988,31(4):478-482

大量计算工作表明,负荷效应计算精度主要取决于: 1.海洋潮汐模型,特别是主波的精度; 2.地壳及上地幔结构模型的选择;  相似文献   

重力潮汐改正          下载免费PDF全文

宋兴黎  于沉 《地球物理学报》1988,31(5):519-526

高精度重力测量迫切要求提高重力潮汐改正的精度,本文应用现有的我国重力潮汐观测成果和海潮重力负荷改正计算结果,提出一组重力潮汐改正的实用计算公式。并且根据计算误差要求小于±1μGal的条件下,将我国划分为四个区,与合适的计算式相对应。此外,对近年来国外学者所提出的理论重力潮汐改正计算公式进行了评述,尤其对过去不曾注意的潮汐永久项（M₀S₀波）在潮汐改正中的影响进行了较详细的讨论。最后还对目前海潮负荷改正的精度提出了一些看法。  相似文献   

通辽CK9井水位的河水荷载效应   总被引：1，自引：0，他引：1  

黄维有  王立海  刘宏伟 《地震》1999,19(3):288-290

１９９１年６￣８月,通过ＣＫ９井记录到一次河水荷载引起井水位变化过程。以深井水位、河水位资料为基础,对这一现象进行分析讨论。  相似文献   

大气潮对重力固体潮影响的研究     

杨又陵  蔚晓利 《地震》1998,18(3):281-285

通过气压变化对重力观测的影响和大气潮对重力固体潮的负荷效应二方面的研究,得出将ＧＳ型重力仪置于密封装置,能使气压的影响降低１个数量级。  相似文献   

加卸载响应比在体应变固体潮中的应用   总被引：10，自引：0，他引：10  

张昭栋  王秀芹  董守德 《地震》1999,19(3):217-222

从岩石的应变与应力的非线性响应分析了体应变固体潮加卸载响应比的物理机理, 给出了体应变固体潮加卸载响应比的计算方法,并以昌平和峰峰台的体应变观测值为例,计算了二台的体应变固体潮加卸载响应比。结果表明,在中强地震前存在增大变化。  相似文献