中国地震地形变国家级台网（定点）调优建议方案

根据我国现有地震地形变观测台网的实际情况，讨论了台网调整优化的基本原则及综合评估标准，并据以提出了调整优化后构成中国地震地形变国家级台网４３个台站。     

华北GPS地形变监测网的建立

全球定位系统GPS是利用监测地壳运动进行地震预测的新手段。华北是一个重要的地震监视区。应用GPS技术在华北布设了一个四维地形变监测网。由于采取了一系列先进的方法和措施,首次观测获得了高精度的成果,为今后大震预测和地球动力学的研究奠定了基础。     

1987年1月8日甘肃迭部5.9级地震与地形变特征

根据１９８７年１月８日甘肃迭部５．９级地震前，该区域的地壳形变中长期背景和定点台站连续观测资料的震反应异常，分析研究了这此异常的变化特征。     

地壳形变与地震

地壳形变与地震博克不断发展的全球定位系统（ＧＰＳ）台阵正在连续不断地测量南加州的地壳形变。这些测量是试图用数量表示板块边界形变与地震发生之间关系的开端。板块构造理论使我们认识到地球表面是由大约１０个大的刚性板块组成的。虽然板块内部是刚性的，但沿着它们...     

地震前兆观测仪器标定问题的探讨

标定工作，在地震前兆观测仪器的研究，使用及所得数据的处理中均已成为一个不可少的环节，但缺少有关标定问题的基石性研究和讨论。本文就标定的定义、种类、目的、要求、存在的问题等做一粗线的讨论，以期今后加强这一工作的深入研究。     

Study on scale dependence of strain value obtained from crustal deformation data

IntroductionIn order to make full use of many kinds of cruStal deformation data to establish dynamic pictUres of crustal strain field, it is necessary to do unified treatment using different types of observation data, and it is not difficult in the respect of models (JIANG, et al, 1999). BUt strsin valuescomputed from different kinds of dare have obvious difference of orders of magnitude, for example, the strain value of small figure compUtation of mobile observation is generally 10', bUt …     

形变数字化资料对邢台地区地震前兆反应的研究

使用张家口、怀来、赤城、宽城、易县和涉县6个台站共计43个测项的数字化资料,针对2002~2005年邢台地区发生的3个M>4级的中强地震,进行了地震前兆和同震反应研究。发现我省数字化形变资料对3次邢台4级以上地震的形变前兆反应主要是以应变为主,包括体应变和线应变,并且异常形态以固体潮畸变和抖动为主。同震反应比较明显,主要以同震阶跃为主。     

数字化地形变资料异常形态与地震

针对近几年马陵山地震台的数字化地形变资料,参照台站仪器工作日志,排除了人为干扰、气象因素等台站已知干扰因素,通过综合分析总结了本台数字化地形变日值分钟值曲线在震前出现的几种异常图象.     

形变标定格值计算软件

为提高地壳形变观测仪器格值标定的真实性、准确性和可靠性,根据《地震前兆台网运行管理办法》和《地震前兆台网形变观测与运行工作细则》,针对不同测项、不同仪器标定的规范要求及特点,应用Visual Basic语言编制了格值计算软件。本文主要介绍了软件的使用、格值计算、误差检查方法,结果以全国形变台网中心推荐的Word格式保存。对水管仪、水平摆、垂直摆仪直接从原始文件读取数据,提高了标定精度,实现了格值标定的半自动化。本软件已应用于河北省地震前兆数字化台站工作。     

海底地壳形变监测现状与启示

海底地壳形变监测对研究洋中脊扩展、火山、海洋板块运动及俯冲带地震活动等具有重要作用,其中GNSS定位与声呐测距技术（GNSS-A）是海底地壳形变监测的主要手段,经过30多年的发展,目前GNSS-A的精度达亚厘米级,可以满足很多海底构造形变的监测需求.我国虽然在大陆地壳形变监测与研究方面已达到国际水平,但在海底地壳形变监测方面与国外相比还存在一定差距,我国海岸线长达3.2万公里,沿海地区的大型活动断裂具有发生大震的风险,如横穿渤海的郯庐断裂带、东南沿海的滨海断裂带都曾发生过大震,因此开展海底地壳形变监测及相关研究势在必行.本文基于GNSS-A的系统组成与工作原理,在总结国内外研究现状的基础上,梳理了关键技术,并结合我国沿海主要活动断裂与地震活动性特点,提出了我国利用GNSS-A技术开展海底地壳形变监测的建议.

     

Research on present crustal deformation in the southern Tianshan (Jiashi) region by GPS geodesy

IntroductionSinceaMs=6.9earthquakeoccurredinArtux,Xinjiang,ChinaonMarchl9,l996,7earth-quakeswithmagnitudeofMs>6werefollowedsuccessivelynearbyJiashi,southemnanshan.Thephenomenonthatagroupofstrongearthquakes(Jiashiearthquakeswann)concentratedwithinashorterperiodoflyearormoreisanunprecedentedeventsincetheinstrUmentalrecordofseis-micityinthecontinent,drawingconsiderableattentionofseismologists.TheJiashiearthquakeswarmhaPpenedonthenortheastemflankofthewestCmsyntaxofHimalayancollisionbeltwheret…     

山西断裂带的地震活动与形变资料分析研究

用地震活动性和水平形变资料及定点地倾斜资料分析构造活动中岩层物理变化与形变位移之间对应关系,对以后GPS观测的形变应用于地震预报做一些尝试性工作。结果表明,GPS资料应用于地震预报是大有前途的。     

Present-day seismicity,stress field and crustal deformation of Egypt

In this study we investigate present-day seismicity and crustal deformation of Egypt based on a comprehensive earthquake catalog from 1900 to 2004 by focal mechanism stress inversion and by recent GPS observations. Spatial distribution of earthquake epicenters indicates that Egypt has been suffered from both interplate and intraplate earthquakes. Most earthquake activity (more than 70%) has been concentrated in northern Egypt along the geologically documented borders of Sinai subplate (northern Red Sea and its two branches Suez rift and Aqaba–Dead Sea transform). The majority of inland earthquake focal mechanisms in Egypt are normal with strike-slip component or strike-slip faulting events. Only a small minority, namely four events, exhibits reverse faulting. The inversion method of Gephart and Forsyth (1984) was applied to calculate the orientation of the principle stress axes and the shape of the stress tensor. The best fitting tensor in Egypt shows homogeneity stress field. The tension stress regime is dominant in northern Egypt. The stress directions are well resolved by the 95% confidence limits, the relative stress magnitude has a value of about 0.3. However, along southern Egypt the strike-slip regime is dominant. The shape factor (R-value) is 0.5, which means that the deviatoric components of σ₁ and σ₃ are of the same magnitude, but of opposite signs. The average horizontal velocity of GPS stations in Egypt is 5.15± 1.1 mm/year in mostly NNW direction. The results of deformation analysis indicate that the northern Egypt is deformed more than the southern part. Only the Egyptian-Mediterranean coastal–Nile Delta zone dominates as a compression deformation area. However, an extensional deformation has been observed throughout the rest of country. This means that the relative motion of African plate with respect to both Eurasian and Arabian has highly controlled the deformation processes in Egypt.     

Field of vertical crustal deformation in North China and the feature of its dynamic evolution

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