基于DEM提取坡谱信息的不确定性   总被引：3，自引：1，他引：2  

王春  汤国安  李发源  朱雪坚  贾旖旎 《地球信息科学学报》2008,10(4):539-544

坡谱是黄土高原地学分析新方法、新思路的探索。本文基于坡谱不确定性的概念及其过程分布模型的论述,以陕北黄土高原国家1∶10000和1∶50000DEM数据为基本信息源,分析了坡谱不确定性的产生原因、主要影响因素与影响规律,阐述了坡谱提取与应用中应注意的主要问题,为正确应用坡谱进行地学分析提供重要依据。  相似文献   

����������ܹ���Ƭѡ��ģ����ϵͳʵ��   总被引：1，自引：0，他引：1  

刘春  荆毅  王解先  姚连璧 《大地测量与地球动力学》2008,28(6):112-116

?????????????Ш?ι?????????о???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????е?????Ч????  相似文献   

Fabrication of Strong Solid Base FeO–MgO for Warm CO2 Capture     

Jie Ling Chen  Xin Yu Ming Dong  Chun Ling Shi  Shuo Hao Li  Ying Wang  Jian Hua Zhu 《洁净——土壤、空气、水》2019,47(8)

  相似文献   

The aftershock process and mechanisms of the May 30, 2004 Kostromskoe earthquake,Sakhalin     

L. N. Poplavskaya  T. V. Nagornykh  O. A. Mel’nikov  D. A. Safonov  Kim Chun Un 《Russian Journal of Pacific Geology》2012,6(2):164-172

The results of the instrumental and macroseismic studies are reported for the tangible earthquake with intensity of up to 5–6 and amplitude of MLH = 4.8 that occurred near the western coast of Sakhalin Island. The main parameters of the Kostromskoe earthquake have been estimated in two versions: (1) based on the data from the local network of digital stations located in southern Sakhalin, and (2) from the complex of local, regional, and global observations. It has been noted that the development of the local network in southern Sakhalin allowed the seismic regime in the earthquake area to be investigated in more detail and the mechanisms of both the individual weak and group events to be derived. The acquired data on the dislocation style of the main shock and aftershocks in the days following the event were used for the geological-tectonic interpretation of the Kostromskoe earthquake.  相似文献   

灾变事件地层斜坡滑塌(带)堆积的特征 ——以滇西保山地区上三叠统南梳坝组为例   总被引：1，自引：1，他引：0  

赵云江  郑春  黄亮  包佳凤  李冰  王晓林  刘晓燕 《地质通报》2012,31(5):745-757

保山地块保山地区三叠系上统南梳坝组研究程度较差,以往的资料多侧重于岩石地层、生物地层的研究,沉积环境资料甚少。通过1∶5万保山幅等8幅区域地质调查,在南梳坝组中发现了灰岩滑塌岩块、下超面、饥饿沉积、水道砾岩、粒序层理、复理石韵律及槽模、沟模等一系列非常重要的沉积相资料,认为其沉积环境为斜坡－盆地环境,总体为一套浊积岩,其中的同沉积“褶皱”、同沉积断层、大量的滑塌面、各种类型的滑塌褶皱组成了3条较大规模的滑塌带,是斜坡环境的沉积物在地震作用触发下形成的,剖面结构“不合理”,明显具有灾变事件地层的特征。灰岩滑塌岩块有极浓的油气味,显示出生储存油气的良好环境。因此,重塑三叠系上统南梳坝组的古地理环境,不仅对发展沉积学、地层学有重要意义,而且对于寻找烃源岩也有重要的现实意义。  相似文献   

A New Specimen of Shansisuchus shansisuchus Young, 1964 (Diapsida: Archosauriformes) from the Triassic of Shanxi, China     

WANG Runfu  XU Shichao  WU Xiaochun  LI Chun  WANG Suozhu 《《地质学报》英文版》2013,87(5):1185-1197

Shansisuchus shansisuchus Young,1964 was restudied on the basis of a new specimen.Some anatomical features that were either briefly or not described at all in the original study were detailed.The new specimen not only provides further information on the skull anatomy and the vertebral column but also expands the range of the geographical distribution of the taxon.With new information,the diagnosis of S.shansisuchus was emended and its phylogenetic relationships were further analyzed.S.shansisuchus differs from other archosauriforms primarily in the presence of a large subnarial fenestra anterior to the antorbital fenestra,tongue-in-groove articulations between the ascending process of the premaxilla and nasal and between the premaxilla and maxilla,a tall and posterodorsally directed ascending process of the maxilla,a knee-shaped process of the postorbital projecting into the orbit,a broad descending process of squamosal distally well forked and a large,deeply bow-shaped intercentrum tightly anchoring/capping the sharp ventral edges of two neighboring centra together in cervical and at least first eight dorsal vertebrae.With additional information derived from the new specimen,the phylogenetic relationships of S.shansisuchus were reanalyzed;it is closely related to Erythrosuchus-Vjushkovia clade.  相似文献   

米苍山东河地质大剖面的构造几何学与运动学及其对上扬子北部陆内俯冲机制的约束          下载免费PDF全文

文竹  何登发  樊春  李英强  孙衍鹏  贺鸿冰 《地质科学》2013,(1):93-108

米苍山位于四川盆地北缘,受秦岭造山带由北向南挤压作用的影响,构造变形特征复杂,深入研究米苍山地区构造变形特征对陆内造山作用以及山前冲断带油气勘探具有积极作用。本文通过对米苍山地区的野外地质考察,对地表产状进行详细观测,建立了米苍山地区东河地表地质大剖面,并且利用等倾角区划与轴面分析,对东河剖面进行构造解析,建立了米苍山造山带构造几何学模型,通过构造楔模型分析了米苍山扇形隆升机制,通过不整合面分析,对四川盆地北部米苍山构造变形时间进行了研究。米苍山南缘基底发育4个构造楔,是影响米苍山南部地层抬升的主要原因,其顶部滑脱层为震旦系,底部滑脱层为元古界变质岩,前缘单斜带由嘉陵江-雷口坡组膏岩层作为滑脱层产生的反冲断层控制,寒武系滑脱层与震旦系滑脱层共同影响了大两会背斜的形成,而米苍山北缘则发育单个构造楔,其顶部滑脱层为震旦系,元古界变质岩为底部滑脱层; 通过对米苍山地区不整合面研究,米苍山造山带自中生代以来,至少经历了印支期与燕山期两次大规模的隆升。因此,米苍山前表现为多期次多层滑脱的构造特征。  相似文献   

Susceptibility evaluation and mapping of China’s landslides based on multi-source data   总被引：1，自引：0，他引：1  

Liu  Chun  Li  Weiyue  Wu  Hangbin  Lu  Ping  Sang  Kai  Sun  Weiwei  Chen  Wen  Hong  Yang  Li  Rongxing 《Natural Hazards》2013,69(3):1477-1495

Landslides are occurring more frequently in China under the conditions of extreme rainfall and changing climate, according to News reports. Landslide hazard assessment remains an international focus on disaster prevention and mitigation, and it is an important step for compiling and quantitatively characterizing landslide damages. This paper collected and analyzed the historical landslide events data of the past 60 years in China. Validated by the frequencies and distributions of landslides, nine key factors (lithology, convexity, slope gradient, slope aspect, elevation, soil property, vegetation coverage, flow, and fracture) are selected to construct landslide susceptibility (LS) empirical models by back-propagation artificial neural network method. By integrating landslide empirical models with surface multi-source geospatial and remote sensing data, this paper further performs a large-scale LS assessment throughout China. The resulting landslide hazard assessment map of China clearly illustrates the hot spots of the high landslide potential areas, mostly concentrated in the southwest. The study implements a complete framework of multi-source data collecting, processing, modeling, and synthesizing that fulfills the assessment of LS and provides a theoretical basis and practical guide for predicting and mitigating landslide disasters potentially throughout China.

  相似文献   

Earth’s thermal cycles and major geological events     

Tang  Chun’an  Chen  Tiantian  Gong  Bin 《中国科学:地球科学(英文版)》2021,64(10):1821-1824

Science China Earth Sciences -  相似文献   

A fast integral equation solver for 3D induction well logging in formations with large conductivity contrasts     

Xiao Chun Nie  Ning Yuan  Richard Liu 《Geophysical Prospecting》2013,61(3):645-657

Simulation of induction logging responses in formations with large conductivity contrasts is an important but challenging problem due to the singularity of a linear system caused by large contrasts. Also, three‐dimensional (3D) analysis of complex geophysical structures usually encounters high computational demands. In this paper, a pre‐corrected fast Fourier transform (pFFT)‐accelerated integral equation method is applied to overcome these difficulties. In the approach, the entire formation is included in the solution domain. The volume integral equation is set up in the region based on the fact that the total field is the summation of the excitation field and the secondary field. The emitted field by the transmitter coil (treated as a magnetic dipole) is regarded as the excitation of the system. Then the method of moments (MoM) is used to solve the integral equation. To reduce the high computational requirements of the MoM, the pFFT method is used to speed up the solution of the matrix equation and reduce the memory requirement as well. The resultant method is capable of computing induction logging problems involving large and complex formations. For problems with high conductivity contrasts, the solution of the matrix equation usually converges very slow or even fails to converge due to the large condition number of the coefficient matrix. To overcome this difficulty, an incomplete LU pre‐conditioner is used to significantly speed up the convergence of the matrix equation, thus further reducing the computation time. Numerical results show that the present method is efficient and flexible for 3D simulation of induction logging and is specifically superior for problems with high conductivity contrasts.  相似文献