Electrochemical modelling of self-potential anomalies     

J. Stoll  J. Bigalke  E. W. Grabner 《Surveys in Geophysics》1995,16(1):107-120

An electrochemical model is proposed, which considers the redox conditions and the electrode kinetics at the mineral surface. Advanced modelling of self-potential (SP) anomalies over ore deposits takes into account the course of the redox potential distribution with depth and the oxidation-reduction processes acting at the mineral-electrolyte interface. The application of this model to a SP anomaly in the vicinity of the German Continental Deep Drilling Program (KTB) can explain the surface and borehole data and gives an estimation of the prevailing thermodynamical conditions in the ground.Exclusively, this paper deals with SP anomalies, which are associated with high conductive graphitic layers. It can be concluded that SP-anomalies give an important hint to electronical conducting structures in the earth's crust.  相似文献   

考虑β随纬度变化下的Rossby孤立波与偶极子阻塞   总被引：1，自引：0，他引：1       下载免费PDF全文

罗德海 《应用气象学报》1995,6(2):220-227

利用文献[4]得到的推广的β平面近似式为f=f0+β0 y—（δ0/2）y2,研究由δ0项所引起的一类Rossby孤立波，而不考虑基流切变和地形等因子的作用。经过计算可以发现，当经向波数为1时，这种孤立波具有显著的南低北高的偶极子阻塞结构，它主要存在于弱西风气流中，并且偶极子的能量随着纬度的增高更容易集中(即高纬偶极子结构趋于局地化)，因而，β随纬度的变化可能是中高纬度地区偶极子阻塞产生的原因之一。  相似文献   

东北地区地震危险趋势分析   总被引：2，自引：3，他引：2  

孙文斌 《东北地震研究》1995,(3)

利用丰富的震史资料，研究了日本海沟、日本海深震与中国东北浅震的时空特征。根据深震、浅震的相关活动特点，我们对东北浅震危险趋势进行了分析。  相似文献   

华北北部地区2005年前地震危险性预测研究进展     

华北北部地区年前地震危险性预测研究组 《地震》1995,(4):391-395

综述了利用确定性和概率性相结合的预测方法，对华北北部地区２００５年前的地震危险性进行了概率预测研究。研究表明，该区在２００年前发生６级以上地震的概率为０．４５，其中涿鹿－怀来一带地区内每个计算单元中的发展概率最高，达到０．０２。  相似文献   

Coda waves: A review     

M. Herraiz  A. F. Espinosa 《Pure and Applied Geophysics》1987,125(4):499-577

The analysis and interpretation of coda waves have received increasing attention since the early seventies. In the past few years interest in this subject has spread worldwide, and the study of high-frequency seismic coda waves has become a very important seismological topic. As a conclusion of the studies accomplished in this time, coda waves are considered the result of scattering processes caused by heterogeneities acting on seismic waves.P andS waves play a particularly important role in this interaction. The process introduces an attenuation which, added to the intrinsic absorption, gives the observed apparent attenuation. Therefore, coda waves constitute a thumbprint left by the heterogeneities on the seismograms. Coda waves offer decisive information about the mechanism of how scattering and attenuation take place. This review describes coda waves in detail, and summarizes the work done in this subject to 1986. The relation between coda waves and attenuation in the context of research on seismic scattering problems is stressed. Particular attention has been given to the application of coda waves to estimate source and medium parameters. The state-of-the-art of the temporal variations of coda wave shape, and the possible use of these variations as an earthquake precursor also are presented. Care has been taken to introduce the statistical models used to deal with the heterogeneities responsible for scattering.  相似文献   

璜山金矿找矿模式及应用     

黄仁荣  何长友 《浙江国土资源》2001,17(2):27-32

诸暨璜山金矿是除治岭头以外浙江省第二金矿,它的找矿模式为"三高两低一复合"的找矿模式,即高金晕、高极化率、高磁场跳跃、低电阻率、低电位和北东断裂与北东东断裂复合处是成矿最有利部位.在其附近仍有类似成矿部位,有望扩大远景.  相似文献   

新疆新源台固体潮潮汐因子特征浅析     

张翼  冯英  马学军 《高原地震》2005,17(3):53-58

采用Venedikov调和分析方法对新源台倾斜固体潮整点观测数据进行处理，得到倾斜固体潮鸩波潮汐因子变化曲线。分析其震兆异常特征，给出了新源台倾斜固体潮潮汐因子异常标准，结果发现异常与周围200km范围内的5级以上地震对应较好，具有较高的预报效能并通过了尺值评分检验。  相似文献   

Triggered-lightning properties inferred from measured currents and very close electric fields   总被引：1，自引：0，他引：1  

V. Kodali  V.A. Rakov  M.A. Uman  K.J. Rambo  G.H. Schnetzer  J. Schoene  J. Jerauld 《Atmospheric Research》2005,76(1-4):355

Triggered-lightning properties, including dart-leader charge density, return-stroke propagation speed, dart-leader electric potential, dart-leader propagation speed, and dart-leader current, inferred from return-stroke current and very close electric field measurements, are presented. Although most of the estimates are based on relatively crude models, they are all generally in good agreement with independent measurements and/or theoretical considerations found in the literature. The results are likely to be applicable to subsequent strokes in natural lightning.  相似文献   

东昆仑活动断裂带东段古地震活动特征   总被引：12，自引：0，他引：12       下载免费PDF全文

李春峰  贺群禄  赵国光 《地震学报》2005,27(1):60-67

东昆仑活动断裂托索湖——玛曲以东肯定那一带， 可据阿尼玛卿玛积峰为界再分为花石峡段和玛沁段两个在几何上不连续的段落. 两段在表征断层全新世活动特征的古地震事件方面有明显差异， 花石峡段的地震活动性明显高于玛沁段的地震活动性. 古地震研究表明， 花石峡段上3次强震活动相邻两次地震发生的时间间隔分别约为500 a和640 a， 玛沁段上最近两次古地震事件间大致有1 000 a左右的时间间隔. 根据断层平均滑动速率计算的花石峡段7.5级地震的平均复发间隔为411~608 a， 相对应的同震平均水平位错约为（5.75plusmn;0.57）m. 虽然玛沁段的地震活动性较弱， 但由于该段上最近一次地震事件离现在较为久远， 已经积累的应变能应该使我们对其未来地震危险性的分析有足够重视.   相似文献   

南秦岭中段中、上志留统金矿化特征及控制因素分析   总被引：2，自引：0，他引：2  

王海元  段湘益 《矿产与地质》2005,19(4):388-393

区域地球化学测量和金矿勘查工作显示,中、上志留统是南秦岭中段继泥盆系之后的又一套赋金地层,这套地层的分布区存在一条近EW向展布的金矿化带,宏观上,金矿化带的展布受青泥河-留坝复背斜和大河店-长坪-留坝区域性断裂带的控制.金矿（化）点和金矿（化）体的产出受层位、岩性、煌斑岩脉、火山活动、褶皱、层间构造破碎蚀变带、标高及氧化作用等因素的联合控制.矿体呈似层状产出,由多个呈串珠状展布的透镜体组成,金矿石类型以微细浸染型为主,属金-毒砂-黄铁矿建造.通过对已有矿（化）点和区域水系沉积物异常区进一步工作,有望找到中-大型金矿产地1～2处.  相似文献