A note on the equivalence of three major propagator algorithms for computational stability and efficiency          下载免费PDF全文

Yanlu Ma  Rongjiang Wang  Huilan Zhou 《地震科学（英文版）》2012,25(1):55-64

It is shown in this note that the three methods, the orthonormalization method, the minor matrix method and the recursive reflection-transmission matrix method are closely related and solve the numerical instability in the original Thomson-Haskell propagator matrix method equally well. Another stable and efficient method based on the orthonormalization and the Langer block-diagonal decomposition is presented to calculate the response of a horizontal stratified model to a plane, spectral wave. It is a numerically robust Thomson-Haskell matrix method for high frequencies, large layer thicknesses and horizontal slownesses. The technique is applied to calculate reflection-transmission coefficients, body wave receiver functions and Rayleigh wave dispersion.  相似文献   

中国地幔结构及物性研究的进展   总被引：1，自引：0，他引：1       下载免费PDF全文

臧绍先  周蕙兰  魏荣强 《地震学报》2008,30(5):525-532

对2004——2007年中国地球物理学家在地幔内部结构和物质性质方面的研究工作进行了总结. 对地幔结构的地震波速度成像,地幔介质的各向异性,地幔间断面,地幔对流,以及地幔介质物性进行了综述,指出了各方面的主要内容,使用的主要方法和主要结果. 从这4年的研究可以发现,一些原有的研究领域工作更加深入,方法更加先进,而且进行了广泛的国际合作,合作的范围也逐渐扩大,方式多样,并出现了一些新的研究方向.   相似文献   

新疆伊犁河流域气候变化(英文)   总被引：3，自引：0，他引：3  

孙慧兰  陈亚宁  李卫红  黎枫  陈亚鹏  郝兴明  杨余晖 《地理学报(英文版)》2010,20(5):652-666

In this paper, the monthly precipitation and temperature data collected at 7 stations in the Ili River Basin from 1961 to 2007 were analyzed by means of simple regression analysis, running mean, db6 wavelet function and Mann-Kendall test. This study revealed the characteristics of climate change and abrupt change points of precipitation and temperature during different time scales in the Ili River Basin within the past 50 years. The results showed that the precipitation increased from the mid-1980s until 2000 and has continued to increase at a smaller magnitude since 2000. Over the studied period, the precipitation increased significantly during the summer and winter months. The temperature increased greatly in the late 1980s, and has continued to show an increasing trend from the year 2000 to present. The temperature increases were most significant during the summer, autumn and winter months. In terms of different geographies, the temperature increase was significant during the winter in the plains and hilly regions; the increase was also significant during autumn in the intermontane basins. The climate change trends in the Ili River Basin were consistent with the changing trends of the North Atlantic Oscillation and the plateau monsoon.  相似文献   

上地幔低速层对670km间断面PdSwr震相影响的探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

魏东平  周蕙兰  王志秋 《地震学报》2000,22(1):59-65

比较详细地研究了670km深度间断面PdSwr震相的一些性质,从理论上对该震相进行了一些初步分析,讨论了在上地幔低速层影响下,该震相的射线离源角与射线路径、震中距、走时及相对振幅之间的关系;初步指出了该震相在实际地震观测图上应该具有的特征．PdSwr震相存在于震中距为13.5～96.5范围内．当＞33时,该震相起始处分辨程度较好,相对容易识别;在13.5＜＜33范围,PdSwr震相的走时曲线由于上地幔低速带及其下部地震波速度的相对快速增加所引起的弱环圈效应,记录到的PdSwr震相波形复杂,较难分辨．   相似文献   

SLC Analysis on Earthquake Activity in the Regions of Sichuan and Yunnan of China     

Gao Yuan  Zhou Huilan  Ma Yanlu 《中国地震研究》2000,14(3):277-283

Using the method of Single-link Cluster(SLC),analyzing the pattern of time sliding of SLCparameters,the earthquake activity in the western Sichuan-Yunnan of China is studiedcombining with the regional earthquake catalogue since 1970 and the tectonic background.Comparing with the high level of earthquake activity in 1970’s and the low in 1980’s,theearthquake activity is in general at the middle level in 1990’s.This paper suggests that SLCmethod,which considers the temporal and spatial relationship among earthquake events,could be adopted to analyze the trend of regional earthquake activity,it is very useful forstudying seismic activity.  相似文献   

几种固沙植物的水分关系   总被引：11，自引：3，他引：8  

刘新民  蒲锦春  刘家琼  贾惠兰 《中国沙漠》1986,6(4):23-33

本文研究对象是甘肃省河西走廊中部地区几种固沙植物和地带性旱生植物。在测定其水势、束缚水含量、自由水含量、蒸腾强度和持水力等生态生理指标的基础上分析讨论了各个植物种水分关系的特点和适应干旱环境的方式。  相似文献   

1979年6、7月份我国东部地区的大尺度涡旋水汽输送     

刘蕙兰 《热带气象学报》1987,(2):129-133

本文计算了1979年6、7月份我国东部地区大气中的水汽涡旋输送。分析了垂直积分涡旋通量场和它的纬、经向分量场的主要特征,以及纬、经向涡旋通量在水汽总输送中的贡献。   相似文献