GPS/IMU辅助机载三线阵影像光束法平差     

刘军  王冬红  张莉  王慧 《测绘学院学报》2009,(1)

建立了GPS/IMU观测值与外方位元素之间的数学关系,引入线性多项式、分段多项式和定向片内插3种数学模型用于机载三线阵影像的单航带及区域网光束法平差。ADS40数据的试验结果表明,在少量控制点的支持下,3种数学模型的单航带平差均可取得优于1.1个像素的定位精度,其中定向片内插模型最适合用于三线阵影像的空中三角测量。区域网平差的结果进一步证明,四角布设平高控制点即可得到最优的平差结果。  相似文献   

Numerical modeling of block structure dynamics: dependence of a synthetic earthquake flow on the structure separateness and boundary movements     

V. I. Keilis-Borok  I. M. Rotwain  A. A. Soloviev 《Journal of Seismology》1997,1(2):151-160

A seismically active region is modelled as a system of absolutely rigid blocks separated by infinitely thin plane faults. The interaction of the blocks along the fault planes and with the underlying medium is viscous-elastic. The system of blocks moves as a consequence of prescribed motion of the boundary blocks and of the underlying medium. When for some part of a fault plane the ratio of the stress to the pressure exceeds a certain strength level a stress-drop (a failure) occurs (in accordance with the dry friction model), and it can cause a failure in other parts of the fault planes. In the model the failures represent earthquakes. As a result of the numerical simulation a synthetic earthquake catalog is produced. The numerical modelling was carried out for three types of structures with increasing of the structure separateness inside of each type and for two types of boundary movements. A synthetic earthquake flow is characterised by several features including the frequency-magnitude relation (the Gutenberg-Richter curve). When the structure separateness increases the slope of the curve changes monotonously in the same direction for all considered types of structures if the boundary movement is the same. The directions of changing of the slope are opposite for two considered boundary movements.  相似文献   

Probabilistic seismic hazard maps for Panama     

Aristoteles Vergara Muñoz 《Natural Hazards》1991,4(1):1-6

Probabilistic seismic hazard maps in term of Modified Mercalli (MM) intensity are derived by applying the Cornell-McGuire method to four earthquake source zones in Panama and adjacent areas. The maps contain estimates of the maximum MM intensity for return periods of 5, 25 and 100 yr. The earthquake phenomenon is based on the point source model. The probabilistic iso-intensity map for a return period of 50 yr indicates that the Panama Suture Zone (PSZ) could experience a maximum (MM) intensity IX, and the Panama Fracture Zone (PFZ) an MM intensity VIII, for the rest of the area this varies from IV up to VIII. The present study intends to serve as a reference for more advanced approaches, to stimulate discussions and suggestions on the data base, assumptions and inputs, and path for the risk based assessment of the seismic hazard in the site selection and in the design of common buildings and engineering.  相似文献   

挤压造山带中的伸展构造及其成因——以滇中地区晚新生代构造为例   总被引：3，自引：0，他引：3       下载免费PDF全文

王刚  王二七 《地震地质》2005,27(2):188-199

在印度和欧亚大陆晚新生代SN向陆内汇聚作用下,川滇地块沿鲜水河-小江左行走滑断裂和红河-哀牢山右行走滑断裂发生SE向逃逸和顺时针旋转,这必然造成其南缘的滇中、楚雄等地区地壳发生挤压缩短和隆升。然而,在滇中高原,SN向的小江断裂系发生张扭性运动,沿断裂出现众多的第四纪伸展和拉分盆地,这反映出滇中高原在晚新生代处于近EW向的伸展环境。力学分析与地质现象之间的矛盾暗示有一种尚未被揭示的伸展变形机制。文中根据该地区的地质和地貌特征论证了晚新生代滇中背形构造的存在,揭示出是背形构造的应力分布状态导致了滇中高原上部地壳EW向伸展的发生,从而使得小江断裂发生分裂并伴随伸展构造的发育  相似文献   

配筋混凝土空心小砌块墙抗震性能试验研究   总被引：3，自引：0，他引：3  

杨晓东  潘文  叶燎原  雷鸿君 《世界地震工程》2005,21(1):70-74

通过对配筋混凝土空心砌块墙体在水平低周反复荷载作用下的试验研究，探讨了配筋混凝土空心砌块墙体的破坏形态、裂缝分布、极限承载力、位移延性与钢筋效应等工作性能，为以配筋砌块为承重材料的房屋城地震区的应用提供科学的依据。  相似文献   

混凝土小型空心砌块墙片伪静力试验研究     

周抚生  郭迅  郑志华  毛国成 《世界地震工程》2005,21(2):75-79

由于强度、环保、施工方便等多方面的优势,混凝土空心砌块成为粘土砖的最理想的替代材料。不过砌块建筑经历的震害很少,抗震研究的成果也少。针对多层砌块建筑的抗震设计需求,模拟不同楼层压力,对15片1.4m×1.2m的空心混凝土砌块墙片进行了伪静力试验,得到了往复力-位移曲线,可供砌块结构抗震设计参考。  相似文献   

Correlated Features of Horizontal Movement-Deformation on the North and East Margins of the Qinghai-Xizang Block before the Kunlun Earthquake with Ms=8.1     

Wang Shuangxu 《中国地震研究》2005,19(3):259-268

INTRODUCTIONThe Qinghai_Xizang(Tibet)blockis praised as a“piston”in the earth dynamics systemof theChinese mainland,andis regarded asthe hotspot in geoscience study all along.The occurrence of theMS8·1strong earthquake on November14,2001,inside the Qin…  相似文献   

Elementary Research on Activity Behavior of the Crust in Funan-Huoqiu Area, Southern Border of the North China Active Block Region     

Yao Daquan 《中国地震研究》2005,19(4):371-380

1.ESSENTIAL GEOLOGIC GEOMORPHIC CHARACTERIN THE STUDIDED REGIONThe studied region of the paper,the Funan-Huoqiu area,extends across the Jianghuai hills andHuaibei plain of Anhui Province,located in the south border area of the North China active blockregi…  相似文献   

Tectonic rotations during the Chile Ridge collision and obduction of the Taitao ophiolite (southern Chile)   总被引：2，自引：0，他引：2  

Eugenio Andrés  Espinosa Veloso  Ryo  Anma  Toshitsugu  Yamazaki 《Island Arc》2005,14(4):599-615

Abstract The < 6 Ma young Taitao ophiolite, exposed at the westernmost promontory of the Taitao Peninsula, is located approximately 40 km southeast of the Chile triple junction and consists of a complete sequence of oceanic lithosphere. Systematic sampling for paleomagnetic study was performed to understand the complex obduction processes of the ophiolite onto the forearc of the South American Plate. Two representative demagnetization paths of remanent magnetization vectors were observed. One is characterized by stable univectorial demagnetization paths and was observed in volcaniclastic rocks and dyke complexes. Orientations of their remanent magnetization vectors indicate various degrees of counterclockwise rotations. The other is characterized by multivectorial demagnetization paths and was observed in the plutonic units (gabbros and ultramafic rocks). From these, two distinct stable remanent magnetization vectors were isolated; one has high coercivity and the other has low coercivity along the demagnetization paths with little influence of viscous magnetizations. This suggests that the complex deformation history involved at least two rotational events. The clockwise rotation, inferred from high coercivity remanent magnetization vectors, was attributed to a ridge collision event and the counterclockwise rotation, inferred from the low coercivity remanent magnetization vectors, was attributed to an accommodation phase into the South American forearc during obduction and final emplacement of the ophiolite. Folds developed during this period. Paleomagnetic restorations of the internal structures of the plutonic units and dyke complexes suggest that they probably originated in a mid‐oceanic ridge environment near a transform fault. The counterclockwise rotation of the plutonic and dyke complex units during the obduction generated tectonic gaps between these and the basement. The volcaniclastic rocks must have been deposited at nearly their present location, filling the tectonic gaps, as less effect of tectonic rotation was identified on these rocks.  相似文献   

Relation between electricity structure of the crust and deformation of crustal blocks on the northeastern margin of Qinghai-Tibet Plateau     

ZHAO Guoze  TANG Ji  ZHAN Yan  CHEN Xiaobin  ZHUO Xianjun  WANG Jijun  XUAN Fei  DENG Qianhui & ZHAO Junmeng Institute of Geology  China Earthquake Administration  Beijing  China 《中国科学D辑(英文版)》2005,48(10)

The Qinghai-Tibet Plateau was formed by coales-cence of microcontinents of different geologic histo-ries, i.e. it consists of a series of blocks, such as Hi-malayas, Lhasa, Qiangtang, Kunlun, Qaidam and Qi- lian blocks from south to north. The blocks moved firstly in the NNE direction, then in the NE direction and at last in the ENE or E-W direction from south to north by a combined action of Indian Plate moving northward and obstruction of Tarim and other blocksnorth of the plateau. T…  相似文献