【摘要】：利用大地測量觀測數(shù)據(jù)反演斷層活動是研究地殼形變，探討地震機理，解釋地學(xué)事件最基本最重要的方法。本文將GPS觀測數(shù)據(jù)與位錯模型相結(jié)合，通過混沌遺傳算法對青藏高原東北緣祁連山斷裂滑動速率進行反演。主要工作與結(jié)論如下： 1.探討反演的數(shù)學(xué)原理及斷層活動模型，并給出斷層活動模型數(shù)學(xué)解析表達式。 2.分析遺傳算法的優(yōu)缺點，，引入混沌優(yōu)化理論，將其與遺傳算法智能集成形成混沌遺傳算法。函數(shù)測試結(jié)果說明該算法收斂速度及精度均優(yōu)于基本遺傳算法。 3.利用2001~2004年GPS觀測數(shù)據(jù)，采用混沌遺傳算法反演了祁連山斷裂現(xiàn)今滑動速率。結(jié)果表明：祁連山斷裂除具有明顯的地殼縮短現(xiàn)象以外，尚有十分顯著的左旋走滑運動且其運動幅度在空間分布上極不均勻，自西向東為1.7~2mm/yr，0.4~1mm/yr和3.8~5mm/yr。 4.將祁連山斷裂滑動速率反演結(jié)果與GPS剖面斷層滑動速率對比分析，結(jié)果基本一致，說明混沌遺傳算法反演斷層滑動速率是可行且有效的。 5.基于祁連山斷裂滑動速率反演結(jié)果模擬祁連山附近區(qū)域水平運動速度場，模擬值與GPS實測值有較好的對應(yīng)關(guān)系。差異主要體現(xiàn)在GPS實測值反映的是區(qū)域斷裂共同作用的結(jié)果，而模擬值僅是由祁連山單一斷裂滑動引起的地殼變形。
[Abstract]:Inversion of fault activity from geodetic observation data is the most basic and important method for studying crustal deformation, exploring seismic mechanism and interpreting geoscience events. In this paper, GPS observation data and dislocation model are combined to retrieve the slip rate of Qilian Mountains fault in the northeast margin of Qinghai-Xizang Plateau by using chaotic genetic algorithm. The main work and conclusions are as follows: 1. The mathematical principle of inversion and fault activity model are discussed, and the mathematical analytical expression of fault activity model is given. 2. This paper analyzes the advantages and disadvantages of genetic algorithm, introduces chaos optimization theory, and integrates it with genetic algorithm intelligently to form chaos genetic algorithm. The result of function test shows that the convergence speed and precision of this algorithm are better than that of basic genetic algorithm. 3. Based on the GPS observation data from 2001 to 2004, the present sliding rate of Qilian fault is retrieved by using chaotic genetic algorithm. The results show that in addition to the obvious crustal shortening phenomenon, the Qilianshan fault has a very significant left-lateral strike-slip movement and its spatial distribution is extremely uneven, from west to east, which is 1.7 ~ 2 mm ~ (- 1) 路yr ~ (- 1). 0.4~1mm/yr and 3.8 and 5 mm. 4. The inversion results of Qilianshan fault slip rate are compared with those of GPS section, and the results are basically consistent, which shows that chaotic genetic algorithm is feasible and effective for inversion of fault slip rate. 5. Based on the inversion results of the slip velocity of Qilian Mountain fault, the velocity field of horizontal motion near Qilian Mountain is simulated, and the simulated value corresponds well with the measured value of GPS. The difference is mainly reflected in the fact that the measured values of GPS reflect the co-action of regional faults, while the simulated values are only the crustal deformation caused by the slip of a single fault in Qilian Mountains.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P227;P228.4

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