长期预报的相空间近邻等距法   总被引：6，自引：0，他引：6  

林振山 《大气科学》1992,16(5):530-537

考虑到确定性系统的外在随机因素和内在随机性(浑沌)所造成的长期预报的不准确性,本义将有关浑沌的理论和数理统计理论结合起来,提出了d维相空间距平符号传播的“正、反规则”假说和近邻等距模式.实例检验表明,经调试后距平符号的报准率一般为66％—80％,而相对误差一般不大于8％.  相似文献   

Precambrian Geochronology, Chronotectonic Framework and Model of Chronocrustal Structure of the Zhongtiao Mountains   总被引：8，自引：0，他引：8  

Sun Dazhong  Li Huimin  Lin Yuanxian  Zhou Huifang  Zhao Fengqing  Tang Min 《《地质学报》英文版》1992,66(1):23-37

The Zhongtiao Mountains, a typical exposure area of Precambrian rocks, are a concentration area of vari-ous types of copper deposit. The rocks were dated using several dating methods. Based on the age data ob-tained by means of three methods, several aspects are dealt with: (1) the dating results obtained by differentmethods and their geological implications have been compared; (2) a chronotectonic framework has been con-structed by means of these reliable ages, which indicates that the ages of the rocks of the Proterozoic mobilebelt fall in a time span of 2400 to 2000 Ma during which global magmatic records are lacking and reflects theages of important events in the mobile belt; (3) according to the ages of inherited zircons, neodymium modelage of the depleted mantle sources (T_(DM)) and geochemical and geological data, a model of Precambrianchronocrustal structure has been constructed, representing a typical for the North China craton.  相似文献   

西安市地裂缝CO₂异常特征及异常机理初步研究   总被引：1，自引：0，他引：1  

林元武  翟盛华  范树全 《地震工程学报》1992,14(3):34-37

本文论述了西安地裂缝0.5m和2.0m深处CO_2异常特征,并对其异常机理进行了初步探讨。结果表明,0.5m深处CO_2异常范围较大,与地裂缝造成的破坏范围基本一致,其CO_2主要来源于生物作用;2.0m深处CO_2异常范围窄,与主地裂缝的位置有很好的对应关系,其CO_2主要来源于断裂活动造成的碳酸盐岩破裂释气。  相似文献   

某些硫化物矿物中Fe的价态电子探针分析     

曹琳  于洪林  邱兆明 《吉林大学学报(地球科学版)》1992,(4)

对湖南上堡、郴县及胶东地区5个黄铁矿样品和5个黄铜矿样品进行的穆斯堡尔谱及电子探针(波谱仪)的分析得出:含Fe~(2+)的黄铁矿中Fe的纯离子浓度I_(La)/I_(Ka)值为0.65±0.05,含Fe~(3+)的黄铜矿中Fe的纯离子浓度,I_(La)/I_(ka)值为0.40士0.05.可见,随Fe价态的升高,比值I_(La)/I_(ka)反而降低.  相似文献   

Soil amplification based on seismometer array and microtremor observations in Chiba,Japan     

Lin Lu  Fumio Yamazaki  Tsuneo Katayama 《地震工程与结构动力学》1992,21(2):95-108

Soil amplification characteristics of earthquake ground motion were investigated in terms of peak ground acceleration and transfer function based on the Chiba array observation records. The amplification of peak ground acceleration occurred mostly at the top soft layer and was similar for the three components. The effects of non-linear response of soil deposits on the transfer function were examined. Transfer functions calculated by ensemble average were close for the two horizontal components while those obtained from a smoothing operation were generally different. Both the transfer functions from the ensemble average and the smoothing operation underestimated the gain factor around the natural frequencies. A two-step smoothing procedure was proposed and a rotary spectrum was used to improve the estimation of the transfer function. Microtremors were observed at the locations of the boreholes where seismometers are buried. The power spectrum and spatial coherency of the microtremors were compared with those of the earthquake ground motion. Emphasis was placed on the wavetypes which dominated the peaks in the power spectra.  相似文献   

Orientation error estimation of buried seismographs in array observation     

Fumio Yamazaki  Lin Lu  Tsuneo Katayama 《地震工程与结构动力学》1992,21(8):679-694

Array observation is an efficient tool to investigate various characteristics of earthquake ground motion. However, seismographs used in arrays may involve unexpected errors in their orientations. Methods of orientation error estimation were developed in three-dimensional space by comparing recorded ground motions at a reference point with those at a checking point. A maximum cross-correlation method and a maximum coherence method were proposed and their accuracy was demonstrated. The earthquake ground motions recorded in the Chiba array and in two other arrays were used in numerical examples. Non-trivial orientation errors were detected for all these arrays. The cross-correlation coefficients and the coherence values between two points increased significantly by correcting the estimated orientation errors.  相似文献   

南极陨石研究的启示Ι:早期太阳星云连续化学分馏作用的岩石化学证据          下载免费PDF全文

王道德  林杨挺 《极地研究》1992,4(3):1-15

球粒陨石金属相的 Ir、Os、Co等亲铁元素的浓度随氧化程度的升高而显著增大 ,其浓度以及铁纹石 Co含量和橄榄石 Fa值均反映了球粒陨石的氧化 -还原程度具有连续变化的特征。根据铁纹石 Co含量、橄榄石 Fa值、低 Ca辉石 Fs值、金属相的 Ir、Os、Co浓度以及其他球粒陨石分类参数 ,可能存在介于 E与 H、H与 L、L与 L L以及 L L与 C之间的球粒陨石过渡型 ,即E/H、H/L、L/L L和 LL/C化学群 ,从而将原有的 9个球粒陨石化学群增加到 1 3个。球粒陨石氧化 -还原程度的变化特征以及球粒陨石过渡型的发现都表明早期太阳星云的化学分馏作用具有连续变化的特点。  相似文献   

层序地层与岩相古地理编图——以中国南方泥盆纪地层为例   总被引：1，自引：0，他引：1       下载免费PDF全文

牟传龙  许效松  林明 《沉积与特提斯地质》1992,12(4):1-9

岩相古地理及古地理学的研究,在我国已有相当长的历史并有着十分丰硕的成果。各家以不同的理论为指导、采取不同的编图方法,从不同的研究角度编制了中国的岩相古地理图。刘鸿允(1955)以古生物地层学的理论为指导,编写了我国第一部古地理学的专著《中国古地理图》,从此,正式揭开了中国古地理学研究的序幕;卢衍豪等(1965)以期为单位,编制了中国寒武纪各期的岩相古地理图;关士聪等(1984),以大地构造学和沉积学的理论为指导,编制了《中国海陆变迁海域沉积相与油气》专著,建立中国各地质时代的  相似文献   

长江口及其邻近海域粘性泥沙的数量与输移   总被引：5，自引：1，他引：5  

林承坤 《地理学报》1992,47(2):108-112

长江口的粘性泥沙有89.6%以上来源于长江补给区,一部分来源于废黄河与黄海补给区。长江补给区的粘性泥沙的汇入百分数及其输沙量两者均为已知,据此计算出长江口粘性泥沙沉积量为4.554×10~7t/a,从长江口输向杭州湾与东海补给区的粘性泥沙输沙量为2.247×10~7t/a,废黄河与黄海补给区输向长江口的输沙量为2.730×10~7t/a。长江口粘性泥沙的数量同1915年与1963年实测地形图比较量算的数量为4.469X10~7t/a基本相符。  相似文献   

黄海粘土沉积物的来源与分布   总被引：4，自引：0，他引：4  

林承坤 《地理研究》1992,11(2):41-51

本文根据区域自然地理原理,划分黄海粘土沉积物的补给区,在粘土矿物鉴定的基础上,用法方程定量探明黄海粘土沉积物的来源与分布,绘出黄海粘土沉积物分布图。图示:黄海来源于长江的粘土沉积物的分布面积,占其总面积的56.5%,来源于黄河的占43.5%。粘土沉积物的分布同洋流、海流的分布相吻合。  相似文献