杜家垞—一碗水库段地震成因讨论     

于品清 《华南地震》1993,(4)

分析了杜家垞——碗水库段于1993年5月3日—15日发生的145次地震。认为这些地震是由清江隔河岩水库第一阶段前期蓄水老滑坡体重新活动引起的,属滑坡型水库地震.  相似文献   

对安康水库诱发地震的预测   总被引：1，自引：0，他引：1  

陈希圣 《内陆地震》1993,7(1):44-54

本文对安康水库地质构造背景、水文地质条件、地震活动特点以及区域内现代应力场作了分析,并通过与条件类似的国内外诱发地震水库类比,对安康(火石岩)水库进行了时、空、强参数预测,认为:当水库水位达到设计水位线330m高程后的1～3年内,库区内会诱发4～5级地震。同时指出了诱震区范围。  相似文献   

陕西石泉M_L4.7地震成因探讨     

陈希圣 《地震工程学报》1993,15(2):76-80

本文根据对石泉水库区地震地质条件、地震活动特征、地下水动态变化、震源机制及地震序列的b值等资料的综合分析,初步确定1978年2月11日发生在长水的ML4.7地震,是因石泉水库蓄水而诱发的。  相似文献   

皂市水库诱震地质条件及危险性初评     

潘建雄  张玉岫 《华南地震》1993,13(3):69-76

对湖南皂市水库库区及区域地壳运动、沉积建造以及浅部岩溶、古岩溶及深部岩溶作用作了较深入的研究与探讨,对与库区关系较密切的断裂及其活动性进行了考察,否定了沿主要库段南缘分布的袁公渡断裂.在上述工作基础上,认为水库区不存在诱发较大地震的地质条件,即使诱发较小有感地震,对大坝亦无影响。  相似文献   

澜沧江小湾水库诱发地震的断裂构造条件分析   总被引：3，自引：0，他引：3  

任金卫 《内陆地震》1993,7(1):30-37

分析了小湾水库库区的断裂构造条件和地质结构特征,在此基础上划分了4个易于产生诱发地震的危险库段。并对各危险库段诱发地震的震级进行了初步预测。  相似文献   

孔隙水压的诱震作用   总被引：2，自引：0，他引：2  

颜玉定 《华南地震》1994,14(2):74-77

孔隙水压σｐ降低了岩体断裂面上的正应力，使原处于稳定状态的断裂发生滑移破裂。σｐ导致断裂的破裂深度增加，诱发出更多的小震并使诱发的主震震级高于原来潜在的最大地震震级。  相似文献   

激电测量在寻找硅质角砾岩型铀矿中的应用     

龚新喜  王建谱  吴际夫  洪建国 《铀矿地质》1993,(2)

对硅质角砾岩型的320矿床的典型剖面进行综合物化探研究结果表明,这类矿床的隐伏铀矿体具有高值大范围的极化率(η_(?))异常,激电测深可圈定矿体的埋深、产状、规模等特征,激电法是寻找这类隐伏铀矿的高灵敏度方法。在这类矿体的地表还有γ,Po,He,Cu,Mo等物化探异常,根据这些综合异常可推断激电异常是否反映了隐伏铀矿体,大大提高物化探综合找矿的能力。对320矿区外围同类异常点进行综合物化探研究的结果,在WBC地区发现了大范围高值激电异常及其它综合物化探异常,而且地质条件、区域航测、重力、水化学、分散流等异常特征也与320矿区相似,预测为隐伏铀矿远景区。  相似文献   

Seismic observations at Lake Emosson,Switzerland     

G. Bock  D. Mayer-Rosa 《Pure and Applied Geophysics》1980,119(1):185-195

Since 1973 several seismic stations have been brought into operation at Lake Emosson, the last large conventional hydrodam in the Swiss Alps. The reservoir is situated in a seismically active zone which stretches from the Rhone valley in southwestern Switzerland into Haute Savoie, France. The monitoring program was started before the first impounding and continued during four full load cycles. A certain correlation is indicated between water level changes and the occurrence near the reservoir of weak seismic events (M_L<0) with high frequency content. A transient series of 30 tremors occurred in August 1974, during a period of rising water level. Local events of a different type frequently occur during the periods of decreasing water level. Their daily distribution indicates a mechanism which is caused by temperature variations.Contribution No. 131 of the Geophysical Institute, Karlsruhe University. Sonderforschungsbereich Felsmechanik of Karlsruhe University. Contribution No. 299 of the Institute for Geophysics, ETH Zürich.  相似文献   

漳华龙地区地磁异常与地震对应关系分析     

郑建志  王绍然  刘景忠 《福建地震》2005,(1)

选取龙岩台的地磁资料,总结漳华龙地区震例,用压磁效应、感应磁效应等理论解释、分析地震与地磁异常的对应关系。结果表明,不同类型的地震,在孕育地震的不同时期,有不同的地质构造运动,产生的地磁异常也是不尽相同的。地磁异常的显著程度不仅与地震的应力降、震级、以及岩石的磁性有关,还和震源机制关系很大。  相似文献   

Meteorological triggering of earthquake swarms at Mt. Hochstaufen, SE-Germany   总被引：3，自引：0，他引：3  

T. Kraft  J. Wassermann  E. Schmedes  H. Igel   《Tectonophysics》2006,424(3-4):245

A growing body of evidence suggests that fluids are intimately linked to a variety of faulting processes. Yet, the particular mechanisms through which fluids and associated parameters influence the stress regime and thus the seismicity of a particular area are not well understood.We carry out a study of the spatio-temporal behavior of earthquakes, fluid-related parameters (groundwater levels) and meteorological observables (precipitation) in the swarm earthquake area of Bad Reichenhall, southeastern Germany. The small volume in which the earthquakes take place, almost yearly occurring earthquake swarms and a permanent, seismo-meteorological monitoring network, provide nearly controlled experimental conditions to study the physics of earthquake swarms and to infer characteristic properties of the seismogenic crust.In this paper we (1) describe this fairly unique study area in terms of geology, seismicity and atmospheric conditions; (2) present two cases of earthquake swarms that seem to follow above-average rainfall events; and (3) examine the observed migration of hypocenters with a simple pore pressure diffusion model.We find significant correlation of seismicity with rainfall and groundwater level increase, and estimate an average hydraulic diffusivity of D = 0.75 ± 0.35 m²/s for Mt. Hochstaufen in 2002.  相似文献