【摘要】：GRACE低軌重力衛(wèi)星能以較高的精度獲取每月地球重力場(chǎng)數(shù)據(jù)，而該數(shù)據(jù)中包含了豐富的時(shí)變地球動(dòng)力學(xué)信息。采用小波分析技術(shù)來(lái)有效地分解重力場(chǎng)變化，得到不同波長(zhǎng)成分的重力變化信息。在研究地質(zhì)構(gòu)造和地震活動(dòng)之間的對(duì)應(yīng)關(guān)系、地球的動(dòng)力學(xué)演變過(guò)程等具有重大的理論意義和實(shí)際應(yīng)用價(jià)值。 本文主要運(yùn)用傳統(tǒng)B樣條小波和改進(jìn)后的球面小波技術(shù)分別對(duì)中國(guó)四川地區(qū)的地面重力觀測(cè)數(shù)據(jù)和GRACE衛(wèi)星觀測(cè)數(shù)據(jù)進(jìn)行了多尺度分解計(jì)算，并結(jié)合該地區(qū)的地震活動(dòng)進(jìn)行了對(duì)比分析。完成的主要研究工作及取得的成果如下： 1、在總結(jié)小波分析理論的基礎(chǔ)上，結(jié)合P尺度三次多項(xiàng)式函數(shù)推導(dǎo)了適用于球面大范圍數(shù)據(jù)計(jì)算的二維球諧小波的構(gòu)造算法，同時(shí)利用C++編制了相應(yīng)的程序。 2、基于疊積差分法計(jì)算了汶川地區(qū)震前、同震及震后的GRACE月重力場(chǎng)觀測(cè)數(shù)據(jù)，并評(píng)估了GRACE月模型的誤差。比較分析了衛(wèi)星重力觀測(cè)數(shù)據(jù)與傳統(tǒng)地面重力觀測(cè)數(shù)據(jù)在地震區(qū)的分布特征和變化規(guī)律。 3、通過(guò)平面二維B樣條小波分析方法，對(duì)我國(guó)汶川地震研究區(qū)域1998年~2005年間的震前多期流動(dòng)地面重力重復(fù)觀測(cè)資料進(jìn)行多尺度小波分解，分析了不同階次小波結(jié)果對(duì)應(yīng)的重力場(chǎng)變化特征，發(fā)現(xiàn)重力異常變化的三階小波分解結(jié)果在震中附近存在明顯變化。 4、構(gòu)建了球面小波分析方法并將其對(duì)GRACE獲取的同震重力變化進(jìn)行了分離處理，結(jié)果表明：同震重力變化的3階分解結(jié)果與地質(zhì)構(gòu)造分布對(duì)應(yīng)較好。
[Abstract]:The GRACE low-orbit gravity satellite can obtain the monthly gravity field data with high accuracy, which contains abundant time-varying geodynamic information. Wavelet analysis technique is used to decompose the variation of gravity field and obtain the information of gravity variation of different wavelength components. It is of great theoretical significance and practical value to study the corresponding relationship between geological structure and seismicity and the dynamic evolution process of the earth. In this paper, the traditional B-spline wavelet and the improved spherical wavelet technique are used to calculate the ground gravity observation data and the GRACE satellite observation data in Sichuan, China, respectively. The seismic activity in this area is compared and analyzed. The main research work and achievements are as follows: 1. On the basis of summing up the wavelet analysis theory, Combined with the cubic polynomial function of P-scale, the construction algorithm of 2-D spherical harmonic wavelet suitable for large-scale spherical data calculation is derived, and the corresponding program is compiled by using C. 2. Based on the overlapping product difference method, the pre-Wenchuan earthquake is calculated. The observation data of the GRACE monthly gravity field after the coseismic and post-earthquake are obtained, and the error of the GRACE monthly model is evaluated. The distribution and variation law of satellite gravity observation data and traditional ground gravity observation data in seismic area are compared and analyzed. 3. The plane two-dimensional B-spline wavelet analysis method is used. In this paper, the multi-phase ground gravity repeated observation data from 1998 to 2005 in Wenchuan earthquake study area in China are analyzed by multi-scale wavelet decomposition, and the variation characteristics of gravity field corresponding to different order wavelet results are analyzed. It is found that the third-order wavelet decomposition results of gravity anomaly change obviously in the vicinity of the epicentre. 4. A spherical wavelet analysis method is constructed and separated from the coseismic gravity variation obtained by GRACE. The results show that the third-order decomposition results of coseismic gravity change correspond well to the distribution of geological structure.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：P223.4

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 薛建華;劉超;;球面小波在衛(wèi)星重力數(shù)據(jù)分析地震形變中的應(yīng)用研究[J];工程勘察;2016年12期

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本文編號(hào)：2237867