天水地区大地电磁测量及深部电性结构   总被引：3，自引：0，他引：3       下载免费PDF全文

刘宝勤  朱佐全  贾政  郭万武  李柱国  张文仁  屈健鹏 《地震工程学报》1995,17(4):70-78

天水地区的大地电磁测量结果表明，在４３ｋｍ左右的深度上普遍存在高导层，这可能是壳幔过渡带的反映。岩石圈厚度大约９５－１１０ｋｍ。在天水太京附近可能存在一条大型近东西向地壳－岩石圈构造带，在秦安以北的叶堡和陇城附近可能也存在一条近南北向的大型地壳－岩石圈构造带，它们都是不同构造单元的分界线。１６５４年天水８级大震可能与深部热异常引起的热应力有关。  相似文献   

堤防隐患探测实例分析   总被引：2，自引：0，他引：2  

石念增  刘康和 《地质灾害与环境保护》2005,16(4):376-382

在堤防隐患探测中，采用地质雷达、高密度电法、电测深法、地震折射波法等综合物探技术，并结合少量的土工试验资料，提高了物探成果的可靠性和实用性，取得了良好的应用效果．为堤防隐患探测提供了新的思路。  相似文献   

灰色GM(1,1)残差修正模型在滑坡预测中的对比应用   总被引：2，自引：0，他引：2  

李秀珍  孔纪名  王成华 《山地学报》2007,25(6):741-746

在传统GM(1,1)模型的基础上,经过不同方式的残差修正,分别建立了一阶残差修正GM(1,1)模型和二阶残差修正GM(1,1)模型。根据滑坡的监测资料,对变形曲线为光滑型滑坡(如黄龙西村滑坡、某滑坡)和阶跃型滑坡(如新滩滑坡、洒勒山新滑坡)分别建立了传统GM(1,1)模型和一阶、二阶残差修正模型,并对不同滑坡各模型的预测精度进行了分析比较。结果表明,残差修正GM(1,1)模型的预测精度明显高于传统GM(1,1)模型的预测精度。对变形曲线为光滑型的滑坡,二阶残差修正GM(1,1)模型的预测精度一般高于一阶残差修正GM(1,1)模型的预测精度;对变形曲线为阶跃型的滑坡,一阶残差修正GM(1,1)模型的预测精度高于二阶残差修正GM(1,1)模型的预测精度。  相似文献   

近年国外传统村镇旅游研究进展及启示   总被引：1，自引：0，他引：1  

王莉  陆林  卢松 《地域研究与开发》2007,26(5):79-84

近年来,随着传统村镇旅游的日益兴起,有关传统村镇的旅游学研究日益受到学术界重视和关注.总结了国内外关于传统村镇的旅游学研究进展,指出国外研究成果主要集中在传统村镇旅游发展影响研究、传统村镇旅游发展与文化原真性保持之间的关系、传统村镇旅游可持续发展等方面.国内研究与之相比,在研究内容、方法、领域、深度等方面仍有很大差距,有待进一步扩展和深入.今后应注意以下几方面问题:研究内容流于表层,应加强研究领域的延伸和深度的扩展;研究方法、手段较为单一,研究理论和方法焏待提高;理论研究滞后于旅游发展实践的现状焏待改善.  相似文献   

国内外城市区域的研究进展     

尚正永  毛广雄 《世界地理研究》2007,16(2):10-16

以研究角度变化为线索，对国内外城市区域相关研究进行了回顾与梳理，发现在经济全球化与信息化背景下，国内外对影响城市区域演化的因素的研究已经从原来仅注重交通等传统因素变为重视对现代因素与传统因素的综合研究，并据此提出了城市区域作今后需要深入研究的主要方向。  相似文献   

Lithology-derived structure classification from the joint interpretation of magnetotelluric and seismic models     

P. A. Bedrosian  N. Maercklin  U. Weckmann  Y. Bartov  T. Ryberg  O. Ritter 《Geophysical Journal International》2007,170(2):737-748

Magnetotelluric and seismic methods provide complementary information about the resistivity and velocity structure of the subsurface on similar scales and resolutions. No global relation, however, exists between these parameters, and correlations are often valid for only a limited target area. Independently derived inverse models from these methods can be combined using a classification approach to map geologic structure. The method employed is based solely on the statistical correlation of physical properties in a joint parameter space and is independent of theoretical or empirical relations linking electrical and seismic parameters. Regions of high correlation (classes) between resistivity and velocity can in turn be mapped back and re-examined in depth section. The spatial distribution of these classes, and the boundaries between them, provide structural information not evident in the individual models. This method is applied to a 10 km long profile crossing the Dead Sea Transform in Jordan. Several prominent classes are identified with specific lithologies in accordance with local geology. An abrupt change in lithology across the fault, together with vertical uplift of the basement suggest the fault is sub-vertical within the upper crust.  相似文献   

Tectonic Evolution and Hydrogeological Characteristics of the Khanaser Valley,Northern Syria,Derived from the Interpretation of Vertical Electrical Soundings     

J. Asfahani  Y. Radwan 《Pure and Applied Geophysics》2007,164(11):2291-2311

The Khanaser Valley was geoelectrically thoroughly surveyed through a grid which consisted of twelve VES profiles. The tectonically-oriented Pichgin and Habibullaev method was enhanced to be applicable in areas of rugged relief and topography. The enhanced profiles were tectonically interpreted and subsurface structures within the Khanaser Valley were delineated. Accordingly, a tectonic evolutional scenario of the valley was established and its hydrogeological characteristics were derived. An approach for groundwater exploration in areas of prominent relief and topography in dry areas such as the Khanaser Valley was established and its validity was estimated.  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   

高密度电法测量系统作常规联合剖面的研究     

龚道平 《华东地质学院学报》2002,25(3):233-236,270

研究了运用高密度电法观测系统作常规电法联合剖面的野外工作方法及数据整理过程，运用高密度电法观测系统，将高密度电法测量与常规联合剖面测量同时进行，有利于对异常体作分析解释。  相似文献   

用MAPGIS二次开发绘制物探电法原始数据图     

李海泉  黄辉  宫元吉 《黄金地质》2002,8(2):62-66

将物探电法的测点数据及测点的大地直角坐标按每条测线上测点由西向东的顺序 ,以统一编号、线号、点号、横坐标、纵坐标、测点数据为字段建成MicrosoftAccess数据库。根据制图比例尺和测点的大地直角坐标逐个计算数据库中所有测点在图纸上的坐标值 ,绘制测点位置子图 ,并在测点位置沿垂直测线方向向东移动 1/ 2测点数据注释的字符宽度 ,并以测点位置为圆心顺时针旋转 6 0°的位置绘制测点数据注释。按照上述方法 ,以MicrosoftVC + + 6 0为工具 ,利用MAPGIS 6 1地理信息系统二次开发技术 ,编制数据处理程序 ,实现电法原始数据图的微机制图  相似文献