应用改进的相干算法提高三维地震资料解释精度   总被引：2，自引：0，他引：2  

闫德庆  杨飞鹏  郭淑敏  董华 《物探化探计算技术》2001,23(4):314-317

作者在文中详细探讨了C1、C2和C3三种相干算法及其。根据三维地震数据体的特点提出了实用的相干算法，并编制了相应的软件。我们对三种相干算法对应相干数据体的解释结果进行了细致的分析，C2相干算法基本能够平衡提高横向分辨率和信噪比之间的矛盾，而C3相干算法则取得了更精确的效果。  相似文献   

地震勘探方法在江西九江-瑞昌地区寻找隐伏岩(矿)体的应用及效果   总被引：1，自引：0，他引：1  

张虎生  张炎孙  沈健 《物探与化探》2001,25(4):279-284

提供了地震勘探方法在金属矿区寻找隐伏火成岩(矿)体的应用技术和地质成果。通过钻探工程验证,其结果与地震解释推断的结论有较好的吻合。这种尝试对拓宽地震勘探服务领域有重大意义。  相似文献   

地表复杂地区煤田地震勘探方法及效果   总被引：2，自引：6，他引：2  

徐成明  王云 《物探与化探》2001,25(6):437-442

以宁夏、山东的煤矿地震勘探为例,介绍了复杂地表工区地震勘探的方法与地质效果。  相似文献   

综合物探方法在地质灾害调查中的应用研究   总被引：12，自引：1，他引：12  

赵成斌  刘保金  姬继法  李长法  袁宏克 《物探与化探》2001,25(6):464-468

介绍了在地质灾害调查中常用的几种物探方法的适用条件和应用范围,并通过实例展示了各种方法的应用效果。结果表明浅层物探方法应用效果显著,在地质灾害调查中具有较好的应用前景。  相似文献   

井间地震走时波形层析成像方法   总被引：2，自引：1，他引：2  

裴正林  余钦范 《现代地质》2001,15(3):333-338

提出了井间地震走时波形顺序反演方法。该方法先利用井间地震走时反演得到速度模型的低频成分 ,然后用井间地震波形反演获得速度模型的高频成分。数值模型试验和实际应用结果表明 ,该方法反演稳健 ,提高了走时成像的分辨率 ,克服了波形成像易于陷入局部极小的缺陷 ,实现了快速高分辨率成像。  相似文献   

New imaging method for seismic reflection wave and its theoretical basis     

HUANG Guangyuan 《中国科学D辑(英文版)》2001,44(2):159-165

Some new imaging formulas for seismic reflection wave and their theoretical basis are given. Phenomena of wave propagation should be characterized by instantaneous spectrum and expressed by complex function of three variables (time, space and frequency) in mathematics. Various physical parameters of medium are also complex functions of two variables (space and frequency). The relationship between reflection coefficient of medium and spectrum of reflected wave is given. Multi-reflection and filter of formations are considered in inversion formulas. Problems in classical convolution model and wave equation are illustrated. All these inversion formulas can be used to image underground medium by wavelet transform and method of “3-basic colors”. Different colors mean different media.  相似文献   

The earthquake sequence of May 1951 at Jucuapa, El Salvador     

N.N. Ambraseys  J.J. Bommer  E. Buforn  A. Udías 《Journal of Seismology》2001,5(1):23-39

Three earthquakes that happened over two days in May 1951 caused extensive damage to villages in a small area of eastern El Salvador (Central America). Contemporary hypocentral solutions indicated focal depths, confirmed by re-calculations using available seismic data, of the order of 90 km, suggesting events associated with the subducted Cocos plate. Macroseismic observations strongly indicate that the earthquakes were of very shallow focus and this is supported by wave-form modeling and the appearance of seismograms recorded in Guatemala. A re-evaluation of the location and source characteristics for these events is presented, together with a fault plane solution and additional macroseismic evidence. The implications for seismic hazard and risk assessment in Central America, where shallow earthquakes of moderate magnitude, frequently occurring in clusters, pose the greatest threat to settlements which, like the area affected by these events, are concentrated along the axis of Quaternary volcanoes.  相似文献   

岩石变形所反映的地震作用过程--第13届国际变形机理、流变学和构造学学术会议概述   总被引：2，自引：0，他引：2  

姚大全 《国际地震动态》2001,(7):9-12

简要介绍了第13届国际变形机理、流变学和构造学学术会议的概况和特点，综述了地震变形作用的研究现状。  相似文献   

A note on the useable dynamic range of accelerographs recording translation   总被引：2，自引：0，他引：2  

M. D. Trifunac  M. I. Todorovska 《Soil Dynamics and Earthquake Engineering》2001,21(4)

Since the late 1970s, the dynamic range and resolution of strong motion digital recorders have leaped from 65 to 135 dB, opening new possibilities for advanced data processing and interpretation. One of these new possibilities is the calculation of permanent displacement of the ground or of structures, associated with faulting or with non-linear response. Proposals on how permanent displacements could be recovered from recorded strong motion have been published since 1976. The analysis in this paper concludes that permanent displacements of the ground and of structures in the near-field can be calculated provided all six components of strong motion (three translations and three rotations) have been recorded, and the records are corrected for transducer rotation, misalignment and cross-axis sensitivity.  相似文献   

Evolution of accelerographs, data processing, strong motion arrays and amplitude and spatial resolution in recording strong earthquake motion   总被引：1，自引：0，他引：1  

M. D. Trifunac  M. I. Todorovska 《Soil Dynamics and Earthquake Engineering》2001,21(6)

This paper presents a review of the advances in strong motion recording since the early 1930s, based mostly on the experiences in the United States. A particular emphasis is placed on the amplitude and spatial resolution of recording, which both must be ‘adequate’ to capture the nature of strong earthquake ground motion and response of structures. The first strong motion accelerographs had optical recording system, dynamic range of about 50 dB and useful life longer than 30 years. Digital strong motion accelerographs started to become available in the late 1970s. Their dynamic range has been increasing progressively, and at present is about 135 dB. Most models have had useful life shorter than 5–10 years. One benefit from a high dynamic range is early trigger and anticipated ability to compute permanent displacements. Another benefit is higher sensitivity and hence a possibility to record smaller amplitude motions (aftershocks, smaller local earthquakes and distant large earthquakes), which would augment significantly the strong motion databases. The present trend of upgrading existing and adding new stations with high dynamic range accelerographs has lead to deployment of relatively small number of new stations (the new high dynamic range digital instruments are 2–3 times more expensive than the old analog instruments or new digital instruments with dynamic range of 60 dB or less). Consequently, the spatial resolution of recording, both of ground motion and structural response, has increased only slowly during the past 20 years, by at most a factor of two. A major (and necessary) future increase in the spatial resolution of recording will require orders of magnitude larger funding, for purchase of new instruments, their maintenance, and for data retrieval, processing, management and dissemination. This will become possible only with an order of magnitude cheaper and ‘maintenance-free’ strong motion accelerographs. In view of the rapid growth of computer technology this does not seem to be (and should not be) out of our reach.  相似文献