地幔蠕动流中一类复杂动力学现象   总被引：1，自引：0，他引：1  

董军  赖健清  彭省临 《大地构造与成矿学》2001,25(3):259-264

从流体力学基本理论出发,在地幔蠕动及热能聚散假说的指导下,考虑地幔蠕动物质在垂直磁场作用下,数学模型方程中所表现出来的复杂动力学现象,并从成矿动力学的角度进行了讨论。  相似文献   

地震学中非线性预测方法的初步研究   总被引：2，自引：0，他引：2  

石特临  郭大庆 《地球科学进展》1995,10(3):273-277

介绍了近年来地震预测学中非线性理论和非线性方法的研究趋势和最新研究进展。在非线性数学模型的研究中，较为成功地将非线性门限模型，指数模型、具有长程关联自回归模型等应用于地震的中期预测上，在分形研究上，明确地取代了以往的一些经验结果，使对地震的活动的经验统计关系上升到分形的理论，在研究地震的动力学机制中，以多滑块－弹簧模型为代表，模拟地壳上地震断层运动机制和事实，建立了粘滑摩擦情况下的参数动力学方程。  相似文献   

Strange seismic attractor?     

Hugo Beltrami  Jean-Claude Mareschal 《Pure and Applied Geophysics》1993,141(1):71-81

Different time series were constructed from the data set containing all the seismic events recorded by the Parkfield network between 1969 and 1987. These series were analyzed to determine whether there exists an attractor in the phase space of the dynamical system characterizing seismic activity and to tentatively establish its dimension. The study has yielded ambiguous results. For all the time series analyzed, the dimension of the attractor appears higher than 12 and the correlation function of the seismic time series is undistinguishable from that of a series of random numbers of the same length. The lack of difference between the scaling parameters of two series suggests that, for all practical purposes, the seismic time series cannot be discriminated from a random series.  相似文献   

孕震物理过程探索     

安镇文  陈瑶 《国际地震动态》1994,(10):5-11

本文根据非线性科学观点，从多分形、自组织临界现象和浑沌动力学等三个方面综述了地震孕育过程的动力学演化特征及其系统的不稳定性问题。  相似文献   

Complexity and Self-Organized Criticality of Solid Earth System(Ⅱ)     

Yu Chongwen Faculty of Earth Sciences  China University of Geosciences  Wuhan 《中国地质大学学报(英文版)》1998,9(1)

ＱＵＡＮＴＩＴＡＴＩＶＥＤＹＮＡＭＩＣＳＴＲＡＴＩＧＲＡＰＨＹ（ＱＤＳ）Ｄｕｒｉｎｇｔｈｅｐａｓｔｆｅｗｄｅｃａｄｅｓｉｎｄｅｐｅｎｄｅｎｔｓｔｕｄｉｅｓｏｆｓｅｄｉ－ｍｅｎｔａｒｙｂａｓｉｎｓｗｅｒｅｃａｒｒｉｅｄｏｕｔａｌｏｎｇｄｉｆｅｒｅｎｔａ...  相似文献   

Phase mixing in time-independent Hamiltonian systems     

Henry E. Kandrup 《Monthly notices of the Royal Astronomical Society》1998,301(4):960-974

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Intermittent behaviour of volcanic tremor at Mt. Etna     

C. Godano  C. Cardaci  E. Privitera 《Pure and Applied Geophysics》1996,147(4):729-744

Harmonic tremor is widely studied and modelled in a very narrow frequency band (1–5 Hz) which represents the eigenfrequencies of a resonator assumed as the source of the phenomenon. Minimal effort was dedicated towards understanding its behaviour in larger temporal scales. Here we characterise the dynamic behaviour of volcanic tremor while evaluating the complete spectrum of the generalised dimension of the phase space. The starting time series constitutes the tremor amplitude picked every 10 minutes. The choice of this lag time is made on the basis of a qualitative analysis of the properties of the tremor. The results show intermittent behaviour of the dynamics which requires an 8-dimensional map to be completely described. An interesting result is that the maximum clustering of point density in phase space occurs in a monodimensional space which implies a periodicity sometimes observed experimentally. An appropriate predictive model needs more constraints on the nature of the eight variables involved in the process.  相似文献   

Dynamics of Global Climatic Changes and Possibility of Their Prediction Using Chemical Data from Greenland Ice     

Sergey R. Kotov 《Mathematical Geology》2003,35(4):477-491

Records from the Greenland Ice Sheet Project Two ice core are considered in terms of dynamical systems theory and nonlinear prediction. Dynamical systems theory allows us to reconstruct some properties of a phenomenon based only on past behavior without any mechanistic assumptions or deterministic models. A near-term prediction of temperature, including a mean estimate and confidence interval, is made for 800 years into the future. The prediction suggests that the present short-time global warming trend will continue for at least 200 years and be followed by a reverse in the temperature trend.  相似文献   

基于一类离散动力系统的混沌加密研究     

刘建生  傅惠 《华东地质学院学报》2003,26(2):136-138

研究了一类具有良好隐蔽性的一元三次离散动力系统的混沌序列产生情况，提出了混沌序列的异或和置乱加密算法。实验结果证明，该系统所生成的混沌序列有密钥复杂、安全性较高的特点，具有推广应用的价值。  相似文献   

矿井开采中的非线性动力学特性     

代高飞  尹光志  皮文丽  李东伟 《岩土力学》2003,(Z2)

采用现代非线性科学中的分叉、混沌、分形和自组织理论,对矿井开采过程中的典型动力学现象进行了研究,分析了这些现象的非线性机制,指出了矿井开采系统中的非线性动力学行为,对矿井灾害的防治和指导矿井采掘活动具有积极意义。  相似文献