Network-magnetotelluric method and its first results in central and eastern Hokkaido, NE Japan   总被引：1，自引：0，他引：1  

Makoto Uyeshima  Hisashi Utada  Yasunori Nishida 《Geophysical Journal International》2001,146(1):1-19

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钻进过程中天然气水合物的分解抑制和诱发分解   总被引：8，自引：1，他引：8       下载免费PDF全文

蒋国盛  宁伏龙等 《地质与勘探》2001,37(6):86-87

讨论了天然气水合物钻进过程中，抑制和诱发孔底出露水合物分解的途径、方法和原理，并介绍了一个诱发水合物分解的钻进过程。  相似文献   

Inversion of magnetotelluric soundings using a new integral form of the induction equation     

Francisco J. Esparza  E. Gómez-Treviño 《Geophysical Journal International》1996,127(2):452-460

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薄壁金刚石钻头感应加热机理探讨   总被引：2，自引：0，他引：2       下载免费PDF全文

丁华东  冯庆芬  金志浩 《探矿工程》1995,(5):34-35,56

分析了中频感应加热生产薄壁金刚石钻头的加热过程，依此提出了薄壁钻头的加热机理，为重新确定模具与感应圈的相对位置，模具设计以及设备选型提供了依据。  相似文献   

2-D inversion of geomagnetic deep-sounding data near Ujjain-Guna, India     

S. N. Prasad  S. K. Verma  J. Pek  V. &#;erv 《Geophysical Journal International》1993,113(3):767-775

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The response of a horizontal conducting cylinder embedded in a uniform earth for uniform and line current sources     

S. O. Ogunade  H. W. Dosso 《Pure and Applied Geophysics》1980,119(1):51-58

The response of a horizontal conducting cylinder embedded in a uniform conducting earth is studied using mathematical models of uniform and line current source excitation for the period range 10 to 10⁴ s. The line current source is located at heights ranging from 100–750 km above the surface of the earth. From the calculated results, it is shown that for periods greater than 10³ s the ratioE _x /H _y at the surface of the earth for localized fields, such as the auroral and equatorial electrojet normally situated at heights of about 100 km, is considerably different from that for a uniform source. The results presented also show that the magneto-telluric method of geophysical prospecting for ore bodies in regions of the electrojet may not be very practicable for periods exceeding 10³ s.  相似文献   

利用广西邕宁、灵山地应力资料预报周边地区中强震发震时间的初步探讨   总被引：1，自引：1，他引：0  

吴时平  王锋  陆炳情  谢彩 《华南地震》2003,23(3):1-10

采用回归分析及周期分析法消除了广西邕宁和灵山地应力测值因观测室室温、湿度等因素所引起的年变化;又对地应力资料做了去除长趋势变化和用卡尔曼滤波平滑地应力曲线的处理后,可以看出邕宁、灵山地应力对于200km范围内的Ms4．5—4．7级地震、300km范围内的Ms4．8—5．4级地震以及400km范围内的M5≥5．5级地震具有一定的预报能力。在中强震发生之前的2年内,邕宁、灵山地应力某分向会出现2次以上的超1．5倍均方差异常,且在2次异常所跨越的时段内至少另有1个分向也会显示有1次以上的异常,当第2次异常结束后的8个月内,在上述规定的距离范围内发生中强震的可能性很大。  相似文献   

The electrical conductivity of the mantle beneath Europe derived from C-responses from 3 to 720 hr   总被引：6，自引：0，他引：6  

Nils Olsen 《Geophysical Journal International》1998,133(2):298-308

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Two-dimensional non-linear inversion of VLF-R data using simulated annealing   总被引：2，自引：0，他引：2  

S.P. Sharma  & P. Kaikkonen 《Geophysical Journal International》1998,133(3):649-668

The VLF-R (very low frequency-resistivity) data, i.e. the apparent resistivity ( ρ _a ) and phase ( φ ) data, were inverted individually and jointly using the VFSA (very fast simulated annealing) global inversion approach. Global inversion results for synthetic data without and with various amounts of random and normally distributed Gaussian noise reveal that the inversion of neither the ρ _a nor φ data alone yields the true parameters of the structures. However, the joint inversion of the ρ _a and φ data yields very good estimates of the model parameters. Five models, representing typical subsurface structures in the shield areas, are studied here. Various models achieved after 10 VFSA runs were used to compute the mean model and the corresponding covariance and correlation matrices, which were used to estimate the uncertainties in the mean model parameters and correlations between the model parameters. We observe that these correlations follow the physics associated with the problem. VLF-R field data due to a nearly vertical contact structure and a very thick dyke-like structure were also inverted to demonstrate the efficacy of the approach in the delineation of the parameters of 2-D structures.  相似文献   

感应法地下管线探测中的一个问题   总被引：2，自引：0，他引：2  

阮百尧 《物探与化探》1997,21(5):382-385,393

通过对地下管线中的感应电流形成机理分析,本文认为,当地下介质导电性很差时,地下管线以磁偶极线为主;而当地下介质存在一定的导电性时,管线则等效于电流线。  相似文献