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71.
江宁地电新台于 1996年开始在新台址处正式观测。经 4年的观测资料积累 ,已具备条件对新台的监测预报效能进行评价。评价表明 ,江宁地电新台观测资料可靠 ,观测精度较高。在1996年 11月 9日南黄海MS6 1地震 (Δ396km)和 1997年 7月 2 8日南黄海MS5 1地震 (Δ36 0km)前 ,地电阻率值显示了较好的前兆异常。对台址测区附近 (Δ <10km)发生的ML2 1地震 ,江宁地电新台地电阻率也观测到异常变化。由此可见 ,江宁地电新台具备较好的监测预报效能 ,有望在江苏及南黄海地区的地震监测预报中发挥作用。 相似文献
72.
The research was aimed at determining the depth to the watertable, aquifer thickness and subsurface geology of the studyarea thus revealing its groundwater distribution as well as its potential as a substitute to the surface water resources.Vertical electrical soundings were carried out in the study area with maximum electrode spread. The Schlumberger electrode configuration technique was adopted. VES data were processedusing Schlumberger analysis package. Lithologic logs of alreadyexisting boreholes in the study area were collected, evaluatedand comparison were carried out. The results reveal alternatinglayers of sands, sandstones, gravel and clay. The lithologiclogs revealed that the study area is underlain by coastal sands (Benin formation). The water table varies from 10–64 m and thickness of the aquifer ranges from 20–80 m. Results show that the study area is underlain by a thick extensive aquifer that has a transmissivity of 2.8 × 10-2m2 s-1 to 3.3 × 10-1m2 s-1 and storativity 1.44 × 10-4 to 1.68 × 10-3m s-1 values. The specific yield is about 0.31.The sandy component of the study area forms more than 90% ofthe sequence, therefore the permeability, the transmissivity andthe storage coefficient are high with an excellent source of groundwater resources. 相似文献
73.
74.
尾矿坝浸润线的坝面快速观测方法研究 总被引:4,自引:0,他引:4
在尾矿砂含水率和电阻率关系研究的基础上,提出了在坝体表面进行高密度电法测量的方法获得电阻率剖面。该方法通过室内实验,可判断浸润线位置,具有可需钻孔施工,机动灵活,工程量小,误差小,测点多,分辨率高等优点,通过实际工程应用,证明该方法能够快速准确地对尾矿坝浸润线实施观测。 相似文献
75.
Shi Xian-xin 《Safety Science》2012,50(4):655-659
Perplexed by severe disasters, spontaneous combustion areas of coalfields in China not only lose a large number of precious coal resources but damage the ecological environment badly. The premise of effective control against the disasters is investigations on the source position and scope of spontaneous combustion areas at coalfields so as to provide scientific basis for fire extinguishment design and construction of coalfields. Working principles, construction methods and detection effects of high resolution earth resistivity method, transient electromagnetic method (small loop-center probe device) applied in the detection of combustion areas at coalfields have been introduced. The application shows that the above mentioned methods can detect the accurate position of underground combustion areas, are effective ones in detecting the combustion center, combusted area and distribution scope of combustion areas at coalfields, and have broad application prospects. 相似文献
76.
W. Miles Gentry Thomas J. Burbey 《Journal of the American Water Resources Association》2004,40(5):1205-1217
ABSTRACT: Recent investigations describing the hydrogeology of the Blue Ridge Province of Virginia suggest the occurrence of multiple aquifers and flow paths that may be responsible for the variable flow behavior of springs and seeps appearing throughout the region. Deep, confined aquifers associated with ubiquitous faults and shallow, variably confined saprolite aquifers may contribute water to spring outlets resulting in significantly different quantities of discharge and water quality. Multiple analyses are required to adequately identify the flow paths to springs. In this investigation, hydrograph analyses, surface electrical resistivity surveys, aquifer tests, and nitrate concentrations are used in conjunction with previously reported analyses from borehole logs and age dating of ground water to identify two distinct flow paths. Results indicate that base flow occurs from a deep fault zone aquifer and such discharge can be maintained even during prolonged periods of drought, while increased discharge identified on hydrograph peaks suggests the occurrence of rapid flow through the saprolite aquifer within a radius of about 25 meters of the spring orifice. Springflow hydrograph analysis is suitable for rapid characterization of flow paths leading to spring outlets. Rapid characterization is important for evaluation of potential water quality problems arising from contamination of shallow and deep aquifers and for evaluation of water resource susceptibility to drought. The techniques evaluated here are suitable for use in other locations in fractured crystalline rock environments. 相似文献
77.
谷秀芳 《防灾减灾工程学报》1998,(2)
利用“地震预报实用化攻关软件”研究总结1994年9月~1995年4月辽宁省境内发生的三次中等地震前台安站地电阻率观测资料,揭示了短期前兆异常特征。通过用月距平方法,滑动富氏分析方法和灰色拓扑预测方法进行数据处理,进一步对前兆异常加以验证,并简要地分析了异常产生的原因。 相似文献
78.
南黄海海域6.1级地震发生前,对海安台N30°W、N70°W、N60°E三组测向和南京台EW向测向地电阻率负异常时段进行了31日低通滑动平均滤波计算,发现异常突出,并超过二倍中误差,经分析认为对地电阻率所出现的中长期异常时段,不能轻易否定,必须不断跟踪分析 相似文献
79.
追踪研究南黄海6-1 级地震前,松散覆盖层巨厚地区形变电阻率异常特征。探讨形变电阻率在破坏性地震前兆跟踪中的作用。 相似文献
80.