Trajectory-based modelling of broad-band electromagnetic wavefields     

D. W. Vasco 《Geophysical Journal International》2007,168(3):949-963

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Fhe application of electromagnetic-induction on the measurement of sea ice thickness in the Antarctic     

Guo Jingxue Sun Bo Tian Gang 《应用地球物理》2007,4(3):214-220

As an important component of the cryosphere, sea ice is very sensitive to climate change. The study of sea ice physics needs accurate sea ice thickness. This paper presents an electromagnetic induction （EM） technique which can be used to measure the sea ice thickness distribution efficiently and its successful application in the Antarctic Neila Fjord. Based on the electrical properties of sea ice and seawater and the application of electromagnetic field theory, this technique can accurately detect the distance between the EM instrument and the ice/water interface to measure the sea ice thickness. Analyzing the apparent conductivity data obtained by the electromagnetic induction technique and drill-hole measurements at same location allows the construction of a transform equation for the apparent conductivity and sea ice thickness. The verification of the calculated sea ice thickness using this equation indicates that the electromagnetic induction technique is able to determine reliable sea ice thickness with an average relative error of only 5.5%. The ice thickness profiles show the sea ice distribution in Neila Fjord is basically level with a thickness of 0.8 - 1.4 m.  相似文献   

Comments on “Steady- and transient-state inversion in hydrogeology by successive flux estimation” by P. Pasquier and D. Marcotte     

Giansilvio Ponzini  Mauro GiudiciChiara Vassena 《Advances in water resources》2007

Pasquier and Marcotte [Pasquier P, Marcotte D. Steady- and transient-state inversion in hydrogeology by successive flux estimation. Adv Wat Res 2006;29:1934–52] propose some modifications to the Comparison Model Method (CMM), in order to apply it to transient 3D ground water flow data for conductivity identification. We present some remarks on that paper to improve the comprehension of the basic features of the CMM and of the real value of the novelties introduced by Pasquier and Marcotte.  相似文献   

ACTIVE system for monitoring volcanic activity: A case study of the Izu-Oshima Volcano,Central Japan     

Hisashi Utada  Yuji Takahashi  Yuichi Morita  Takao Koyama  Tsuneomi Kagiyama 《Journal of Volcanology and Geothermal Research》2007

A system is proposed for the monitoring of changes in the underground structure of an active volcano over time by applying a transient electromagnetic method. The monitoring system is named ACTIVE, which stands for Array of Controlled Transient-electromagnetics for Imaging Volcano Edifice. The system consists of a transmitter dipole used to generate a controlled transient electromagnetic (EM) field and an array of receivers used to measure the vertical component of the transient magnetic field at various distances, with automatic operation of both units. In order to verify the performance of the proposed system, numerical and field experiments were carried out by application of the system to the Izu-Oshima volcano, where a remarkable change in the apparent DC resistivity over time had been detected in association with the eruption in 1986.  相似文献   

电磁感应技术在南极海冰厚度探测中的研究与应用   总被引：1，自引：0，他引：1  

郭井学  孙波  田钢 《应用地球物理》2007,4(3)

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地下管线探测电磁场异常特征的理论与实践   总被引：4，自引：0，他引：4  

张宗岭  张效良 《地质与勘探》2002,38(1):83-85

分析了频率域中一次电磁场和二次电磁场的分布特征，以及利用Hx,Hx的异常特征点确定地下金属管线的理论依据，指出了在复杂地质情况下进行正常场改正的必要性，最后利用不同类型管线检测实际资料，说明了方法的有效性。  相似文献   

被动源高频大地磁系统的应用   总被引：2，自引：1，他引：2  

罗洪发 《地质与勘探》2002,38(6):51-54

扼要介绍了高频大地电磁测量的方法原理和场源机制。阐述了方法的适用范围及不同探查对象条件下，野外数据采集的一般要求，结合具体实例探讨了本方法在找矿，找水及查找各类地质灾害隐患方面的应用尝试。  相似文献   

甚低频电磁法在某萤石矿勘查中的应用   总被引：6，自引：0，他引：6  

白大明  关继东  苏来柱 《物探与化探》2002,26(1):39-41

内蒙古海力敏萤石矿属热液脉型,萤石—石英矿受花岗岩体内NW向断裂破碎带控制。矿区开展了甚低频电磁法找矿勘查研究,在已知矿体上测得明显的甚低频电磁异常,证实了该方法对寻找此类萤石矿床的有效性。在不易识别开采的掩盖区,所测甚低频电磁异常显示控矿断裂带仍存在,极可能赋存萤石矿体。  相似文献   

相位激电法(偶极-偶极)单频电磁耦合校正方法   总被引：2，自引：2，他引：2  

王书民  雷达 《物探与化探》2002,26(1):57-59,63

主要介绍一种相位激电法(偶极—偶极,以下简称偶极)电磁耦合校正方法,其原理是将视电阻率近似视为均匀大地电阻率,利用均匀大地条件下偶极装置电磁感应响应的正演计算方法,算出电磁感应响应,再将其从观测的总响应中去除,从而达到电磁耦合校正的目的。  相似文献   

甫沙-曲吕西地区电磁阵列剖面法研究     

杨军  陈俊湘  徐国强  戴世坤 《新疆地质》2002,20(Z1):121-124

通过对塔里木盆地西南缘甫沙-曲吕西地区电法勘探(CEMP),以电性剖面为主,综合地震、重力、地面地质等资料,运用前陆盆地构造分析学理论,对该区构造式样及局部构造进行了研究,摸索了一套研究复杂构造的方法,弥补了地震勘探的不足.  相似文献