层状介质弹性参数反演问题研究综述   总被引：9，自引：3，他引：6  

宋海斌  张关泉 《地球物理学进展》1998,13(4):67-78

地震波动方程反问题的研究具有重要的理论意义和实践意义。由于高维波动方程反演问题理论研究的困难和巨大的计算量,层次介质弹性参数研究在数学界和地球物理学引起了广泛的关注。经过前人近三十年的努力,一维声波方程的单参数反演理论已趋成熟,并已逐步实用化。基于矢量波动方程的多参数反演,非脉冲响应对应的反问题是层状介质弹性参数反演需要进一步深入研究的问题。  相似文献   

APPLICATION OF THE HARTLEY TRANSFORM IN THE COMPUTATION OF THE GEOID IN CHINA     

NING JinshengLI JianchengCHAO DingboNING Jinsheng  Academician  Professor  School of Geo-science  Surveying Engineering  WTUSM  Wuhan  China   《地球空间信息科学学报》1998,(1)

This paper presents a method for the computation of the Stokes for-mula using the Fast Hartley Transform（FHT）techniques.The algorithm is mostsuitable for the computation of real sequence transform,while the Fast FourierTransform（FFT）techniques are more suitable for the computaton of complex se-quence transform.A method of spherical coordinate transformation is presented inthis paper.By this method the errors,which are due to the approximate term inthe convolution of Stokes formula,can be effectively eliminated.Some numericaltests are given.By a comparison with both FFT techniques and numerical integra-tion method,the results show that the resulting values of geoidal undulations byFHT techniques are almost the same as by FFT techniques,and the computation-al speed of FHT techniques is about two times faster than that of FFT techniques.  相似文献   

APPLICATION OF SEPARABILITY CRITERION IN DESIGN OF DEFORMATION MONITORING NETWORKS     

CHEN Yongqi TANG HongwaiCHEN Yongqi  Professor  School of Geo-science  Surveying Engineering  WTUSM  Wuhan  China   《地球空间信息科学学报》1998,(1)

A monitoring scheme must be so designed that several possible mod-els can be efficiently separated in the stage of analysis of deformation measure-ments.Based on the concept of separability developed by Chen and Chrzanowski,a methodology for the design of monitoring schemes has been developed by the au-thors.In the method a computer simulation technique is employed,into whichsome rules have been elaborated allowing minimal human intervention.In this pa-per the criterion is first presented and the design technique using the step one up-dating procedure is discussed.Finally,design of a simulated monitoring networkis made as a demonstrating example.  相似文献   

EFFECTS OF SOLAR FLARE ON THE MIDDLE ATMOSPHERE     

王英鉴 《Acta Meteorologica Sinica》1998,(4)

The SME satellite data of solar UV radiation and mesospheric ozone during solar flare in 1982are analyzed.The results show that the Ha line index used in the solar flare classification is not aproper parameter for studying the effects of solar activity on the photochemical process in themiddle atmosphere.  相似文献   

The North-South Asymmetry in the Green Corona     

Elena Dzifčáková  Vojtech Rušin 《Studia Geophysica et Geodaetica》1998,42(2):101-111

The north-south asymmetry of the Fe XIV 530.3 nm coronal emission line (the green corona) over cycle 22 was investigated. The green corona line brightness was dominant in the southern hemisphere during cycle 22 (A = –0.07), except for short periods of the ascending phase of the activity cycle. The asymmetry of the semi-annual mean over the period 1940 – 1996 was also studied. The asymmetry, during these years, reached its maximum in 1962 – 1966, and then decreased. Important periodicities of the asymmetry in cycle 22, e.g., 158 and 350 days, 2.39 years were found. Similar periodicities were also detected in the years 1940 – 1996. An FFT analysis was used to detect these periodicities.  相似文献   

Comprehensive Study of the Activity in the Middle Sections of Huangzhuang-Gaoliying and Babaoshan Faults     

Che Zhaohong  Gong Yuemu  Liu Shanhua  Liu Tianhai  and Meng GuojieCenter for Comprehensive Surveying  SSB  Beijing  China 《中国地震研究》1998,(2)

To monitor the activity of the Huangzhuang-Gaoliying and Babaoshan faults in their middle sections,a network for leveling,short-side ranging,and gravity and geomagnetic observations at the same time and at the same station was set up.By this network,the time and space distribution and the relation between different observations have been studied.It is considered that the Huangzhuang-Gaoliying fault is in a locked state for rapid strain energy accumulation,while the Babaoshan fault is in a state of creep or unrestrained motion.To do comprehensive monitoring of fault activity by making deformation,gravity,and geomagnetic observations at the same time and at the same station,it would be possible to acquire the microscopic state of fault activity and the data of earthquake preparation; such an approach is considered worth popularizing.  相似文献   

唐山地震的重力异常及其震后变化   总被引：1，自引：0，他引：1  

张晶  孙柏成 《地震》1998,18(3):293-298

将唐山地区 1 981～ 1 997年流动重力资料进行整理 ,分析唐山地震前后重力变化的全过程。震后二十余年 ,唐山地区未出现过震前量级的重力异常 ,且在震后 1 0年里重力值逐渐恢复至正常水平。研究表明 ,唐山地震前的异常变化是确实存在的 ,1 995年 1 0月古冶 ML5.4地震前亦出现了形态相似的重力变化  相似文献   

The reflection and transmission of elastic waves at a interface between a transversely isotropic elastic soils and saturated soils     

YA YUAN HU LI ZHONG WANG YUN MIN CHEN SHI MING WU The Civil Engineering Department of Zhejiang University  Hangzhou  China 《地震学报(英文版)》1998,(6)

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浅析通信行业引入GIS的必然性与市场前景     

Wu Xincai 《地球科学》1998

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1995年云南孟连西7.3级地震前震序列特征及其与主震的关系     

刘祖荫  钱晓东  张俊伟 《湖南地质》1998,(4)

在分析１９９５年云南孟连西７３级地震的前震序列时,发现跟踪最大前震６２级的余震序列中,有一组较大震级的地震呈现出随时间的增长不断线性递增的特点,这种特点在云南其他震例中也曾多次出现过。利用修正的大森公式ｎ（ｔ）＝ｋ／（ｔ＋ｃ）ｐ拟合该序列,在获得的参数重新构造的频度－线性化时间坐标中,这一组地震显示出与海城前震序列随时间变化震级出现非线性增强的共同特征。采用表征物质加速应变而失稳的方程ｄ（∑Ｍ０１／２）／ｄｔ＝ｃ／（ｔｍ－ｔ）ｎ,对孟连西前震序列多方面进行跟踪定量分析,预测主震的发生时间平均比实发时间仅推迟２６ｍｉｎ,震级相差０１７级。  相似文献