云南耿马7.2级地震地表破裂带研究   总被引：2，自引：1，他引：2       下载免费PDF全文

周瑞琦  俞维贤  谷一山  姚孝执 《地震地质》1990,12(4):291

根据野外考察的实际资料,本文介绍了耿马7.2级地震地表破裂带的展布,结构要素及组合、位移分布等情况。同时依据位错资料对破裂带的应力活动及断裂两盘的运动状态进行了初步分析。认为本次地震发震构造以右旋走滑为主兼具张性,主压应力优势方位为N5°—10°E。断层两盘相对运动的总体方向为N55°W左右,断层运动的滑移角在30°—40°之间  相似文献   

EFFECTS OF OROGRAPHY AND HORIZONTAL DIFFUSION ON THE GENERATION OF THE ASYMMETRIC MOTION IN THE BAROTROPIC FILTERED MODEL ATMOSPHERE          下载免费PDF全文

Liao Dongxian  Yu Hai''an 《Acta Meteorologica Sinica》1990,4(3):324-333

By utilizing the barotropic vorticity equation including effects of orography and horizontal diffusion,the linearized equations describing symmetric and antisymmetric motions and their analytic solutions are pre-sented.It can be found from the solutions that no matter what kind of motion may be,each solution consistsof three waves,namely,Rossby wave related to initial values,marching wave propagating at Rossby wavevelocity and stationary wave.The latter two are closely related to orography and horizontal diffusion.However,if the motion is symmetric at the initial instant,then the antisymmetric components of orographyand of horizontal diffusion are likely to lead to the generation of antisymmetric motion.In the steady state,the symmetric flow is connected with symmetric orography and horizontal diffusion and the antisymmetricflow with antisymmetric orography and horizontal diffusion.Further,in order to verify the above analysis,three numerical experiments have been made.The results show that antisymmetric orography can produceantisymmetric motion.Finally,the atmospheric interactions between Northern and Southern Hemispheresare discussed.  相似文献   

On Eastern Asian Dust Storm     

Zhao Bolin  Yu Xiaoding 《大气科学进展》1990,7(1):11-26

In this paper, the characteristics of eastern Asian dust storm are examined with emphasis on the satellite measurements of aerosol optical thickness. The reflectivity of solar radiation from the earth’s atmosphere depends on the optical thickness. The satellite measurement of radiance of sunlight, scattered by the earth and its atmosphere, is used to derive the properties of aerosol on oceanic surfaces. This paper involves the following: (1) investigation of the measurement of dust storm over the oceanic surface by GMS satellite; (2) investigation of the measurement of dust storm over the land surface by ground-based instruments such as actinometer, lidar, etc.; (3) for comparison, de-riving an atmospheric aerosol size distribution over the oceanic surface of calm weather through measurements of NOAA satellite; and (4) the weather process and its mass load of eastern Asian dust storm.  相似文献   

地震勘探频率中近抛物线型衰减的物理解释     

杨宝俊  张伯军  杨友发  余迪钧 《吉林大学学报(地球科学版)》1990,(3)

几十年来,人们对地震波在真实介质中传播发生的衰减进行了理论与实践两方面研究。文中综述了前人工作,包括机制与测试工作,同时给以评论,指出对于传播距离与频率之间关系研究不够,并且对实测结果作物理解释较少。作者用VSP技术进行了不同距离上衰减与频率之间关系的研究,提出了反射补偿的具体方法,采用了多项式拟合技术,得到了近抛物线型衰减的结果。然后,利用波前压力与振动的固有频率思想对测试结果进行了讨论,得出一些有益的结论。  相似文献   

湖北凤梨山铅锌矿床的闪锌矿标型特征及其成因探讨     

俞惠隆 《矿物岩石》1990,10(1):28-34,T002,T004

凤梨山铅锌矿产于中酸性岩浆岩与三叠系海相碳酸盐地层的热接触变质晕内。闪锌矿为主要的矿石矿物。其成矿作用可分为沉积成岩同生成矿期（I）、渗流热水成矿溶液改造富集成矿期（Ⅱ）和热接触变质成矿期（Ⅲ）。本文根据闪锌矿的地质产状、矿物共生组合及成矿作用的特点，对它进行了物理化和化学性质、矿物包裹体特征、硫与铅同位素地球化学的研究，并探讨了它的成因问题。  相似文献   

茅坪钨锡多金属矿床流体包裹体特征及地质意义   总被引：7，自引：0，他引：7  

郑跃鹏  喻铁阶 《矿产与地质》1991,5(4):311-317

系统研究茅坪矿床各类型矿体矿物中包裹体显微镜下特征和均一温度、冷冻盐度、气液相成分、δD、δ~(18)O等特征及其差异,并对有关数据进行了热力学计算.结果表明锡钨矿化分别主要富集于高中温和中低温条件,矿化压力为500～550bar,pH为3.97—4.91、Eh为-208～-439mv,fo:为10~(-30)～10~(-50)bar,成矿流体来源于岩浆水和地层水.  相似文献   

马17井映震灵敏的应力条件数学模拟研究     

高维安  鱼金子 《地震地质》1991,13(3):269-275

本文利用线弹性理论的二维有限元方法,计算了马17井的区域应力及井区平面与剖面的应力状态,研究该井映震灵敏的应力条件。计算结果表明井区在华北地区中强以上地震活动时具有一定的应力集中  相似文献   

COMPARISON OF AEROSOL CHARACTERISTICS OVER MAINLAND OF CHINA AND WESTERN PACIFIC AND ITS LONG-RANGE TRANSPORT          下载免费PDF全文

Wen Yupu  Yang Shaojin  Yang Yinan  Chen Bingru  Zhou Mingyu  Zheng Yueming  Zhang Ziyu  Yu Hongjian 《Acta Meteorologica Sinica》1991,5(2):160-170

Based on the aerosol data obtained at Shangdianzi regional background monitoring station together withthe air trajectory analysis,the chemical constituents of the aerosol from the different sources are discussed andcompared with the aerosol samples collected over the western Pacific.The results show that the relative massconcentrations of the crustal and pollutant elements in the aerosol collected over the ocean are higher than thosebeing observed at Shangdianzi in particle size above 4.7 μm and below 0.65μm in diameter.The variationsof the enrichment factors of these elements in marine aerosol with particle size are different from those in shang-dianzi's samples.The former enrichment factors are evidently higher than the latter above 1.1 μm in diameter.On the basis of the comparative research,the long-range transport processes of aerosol particles are discussed.  相似文献   

一类超线性椭圆方程组解的存在性     

于锦海 《测绘学院学报》1991,(2)

本文研究半线性椭圆方程组在Ω中以及Dirichlet边界条件u|Ω=V|Ω=0的解的存在性.其中Ω是R~n中光滑有界开集。关于非线性项f(x,u)作超线性假设。在此假设下,若f满足增长限制|f(x,u)|≤a|u|°=b,其中a、b、σ是常数.1<σ<(n+2)/(n-2),则利用临界点方法.证明了(*)+b,其中a、b、σ是常数,1<σ<(n+2)/(n-2),则利用临界点方法.证明了(*)有古典解存存。这样不用对(*)的解作先验估计,解决了Figueiredo和Mitidieri在[2]提出的问题。  相似文献   

利用LAU效应测定干涉滤光片的中心透过率波长值     

余飞鸿  梁荫中 《武汉大学学报(信息科学版)》1991,(4)

本文提出一种利用LAU效应测定干涉滤光片中心透过率波长值的理论和实验方法,这一方法不但具有精度高、装置简单、方法简便等优点,而且由该方法所获得的实验结果,可以作为当前有关平面周期物体LAU 效应新理论的一种实践检验。  相似文献