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41.
根据遥感图象的解译结果,介绍了环形构造的基本特征及其对中强地震的控震作用,指出了环形构造的地震构造模式和环形构造对分析地震构造环境和地震预报具有一定的意义。 相似文献
42.
本文以9015号热带气旋登陆后造成的省淮以南大暴雨天气为例,与8闪一般暴雨天气的热力动力条件进行对比,分析它们之间的异同点,并利用二维点尺度力学模式对地面中尺度锋区引起民环流进行模拟试验,结果表明,在热带气旋伸向东北部一条辐合线的偏北旗帜的中尺度锋区驱动扰动涡旋,在涡旋的上升部位可对大暴雨有增幅作用。 相似文献
43.
Water is the most active component in all geological systems.It has an important effect on the physical properties of minerals and melts.It also plays a key role in the evolution of the Earth.Accurate thermodynamics data on water are currently confined to pressures below 1.0GPa and temperatures below 900℃.Presented in this paper are new data available on the P-T properties of water at pressures up to 5.0GPa,develoged from differential thermal analysis and ultrasonic wave amplitude analysis.It has been found that there may exist another ternary point at 3.0GPa and that ultrasonic wave amplitude change of ice-water transition shows two inflection points above 2.0GPa, consistent with the two peaks of differential thermal curves above 2.0GPa .It may be a new phenomenon which needs further study. 相似文献
44.
星载合成孔径雷达遥感及多卫星遥感数据融合方法 总被引:5,自引:0,他引:5
合成孔径雷达(SAR)数据,以其特有的成像机理和对地物信息的属性描述及其全天时、全天候作业能力,形成了对传统多光谱遥感数据的互补。通过数据融合技术,可以优化遥感信息资源,实现多卫星遥感数据的优势互补,使遥感信息得到最大限度的利用,从而为地学研究中的各种模型方法和决策系统提供科学依据。根据信息的抽象程度不同,融合可分为原始数据融合、目标级融合和决策级融合三个层次。在不同的层次具有相对应的信息融合方法。 相似文献
45.
Bi Fuzhi Yuan Youshen Institute of Crustal Dynamics State Seismological Bureau Beijing 《《地质学报》英文版》1997,71(4):395-406
This paper expounds the quantitative tectonic indicators and some qualitative indicators of large earthquakes in the coast areas of Fujian, Guangdong, Taiwan and Hainan. The main quantitative indicators include uplift amplitude of the Moho, Quaternary and Late Holocene coasts. The paper also gives a brief account of the research method on quantitative indicators of surface uplifted zones. Taiwan is a famous neotectonic zone and an area of large earthquakes in the world. There is only one large-earthquake area in each of Fujian, Guangdong and Hainan Provinces. Along the coast large earthquake areas there are certainly many remains of crustal activity. Among these remains, coast activity, taking the sea level as the accurate marker horizon, can determine not only the amplitude of coastal elevation and subsidence in a certain period, but also the cycle and rate of positive or negative movements. 相似文献
46.
Hu Yi-li Xu Jun Duan Yong-kong Xu Zhao-yong Yang Run-hai Zhao Jin-ming 《地震学报(英文版)》2004,17(6):725-734
A new method of detecting the vertical bearing capacity for single-pile with high strain is discussed in this paper. A heavy
hammer or a small type of rocket is used to strike the pile top and the detectors are used to record vibration graphs. An
expression of higher degree of strain (deformation force) is introduced. It is testified theoretically that the displacement,
velocity and acceleration cannot be obtained by simple integral acceleration and differential velocity when long displacement
and high strain exist, namely when the pile phase generates a whole slip relative to the soil body. That is to say that there
are non-linear relations between them. It is educed accordingly that the force P and displacement S are calculated from the amplitude of wave train and (dynamic) P-S curve is drew so as to determine the yield points. Further, a method of determining the vertical bearing capacity for single-pile
is discussed. A static load test is utilized to check the result of dynamic test and determine the correlative constants of
dynamic-static P(Q)-S curve.
Foundation item: Key projects of the tenth Five-year Plan of Yunnan Province (documented Yunnan district [2002]54-02-02) and Geophysical
Society of Yunnan Province. 相似文献
47.
Gürcan Büyüksalih Güven Koçak Murat Oruç Hakan Akçin Karsten Jacobsen 《The Photogrammetric Record》2004,19(107):200-218
TK-350 stereo-scenes of the Zonguldak testfield in the north-west of Turkey have been analysed. The imagery had a base-to-height ratio of 0·52 and covered an area of 200 km × 300 km, with each pixel representing 10 m on the ground. Control points digitised from 1:25 000 scale topographic maps were used in the test. A bundle orientation was executed using the University of Hanover program BLUH and PCI Geomatica OrthoEngine AE software packages. Tests revealed that TK-350 stereo-images can yield 3D geopositioning to an accuracy of about 10 m in planimetry and 17 m in height. A 40 m resolution digital elevation model (DEM) was generated by the PCI system and compared against a reference DEM, which was derived from digitised contour lines provided by 1:25 000 scale topographic maps. This comparison showed that accuracy depends mainly on the surface structure and the slope of the local terrain. Root mean square errors in height were found to be about 27 and 39 m outside and inside forested areas, respectively. The matched DEM demonstrated a systematic shift against the reference DEM visible as an asymmetric shift in the frequency distribution. This is perhaps caused by the presence of vegetation and buildings. 相似文献
48.
苏里格庙气田主要产气层为上古生界石盒子组盒8段,属于三角洲平原分流河道沉积。复合砂体近南北向展布;单砂体的厚度变化大,非均质性明显,储渗变化大。盒8段含气砂岩在AVO资料上有明显反映;在综合测井资料上,盒8段表现出自然伽玛测井值、密度测井值、补偿中子测井值都偏低,电阻率、声波时差测井值较高,出现了大幅度的自然电位异常。利用核磁共振测井技术测得苏里格庙区某井盒8段3555.9m~3559.6m为气层,3560.6m~3572m为气水层,与生产实践吻合得很好。 相似文献
49.
数学形态学着重于分析和处理图像的几何结构信息。根据这一原理,在图像分类预处理过程中,对各种地物区域的几何结构特点进行分析,构造相应的结构元素,然后对图像进行形态迭代分解法(IMD,Iterative Morphological Decompostion)变换。在变换结果中,地物区域的灰度信息进行了归一化处理,同时区域的几何结构特点和独立地物得到了有效保留。将多光谱图像的IMD变换结果进行分类实验的结果表明,该方法可以有效提高多光谱图像分类的精度和效率,具有较强的适用性。 相似文献
50.
基于EM算法和单幅雷达图像阴影的控制点坡度校正 总被引:1,自引:0,他引:1
对在我国现有的条件下进行控制点坡度校正的必要性进行了阐述,并分析了EM算法。根据EM算法以及基于区域增长的余弦散射模型建立了控制点坡度校正模型,并用河北省张北地区的雷达影像进行了实验,取得了较高的精度初值。 相似文献