CAJ | 학술논문

将数字信号分析中常用的傅里叶变换引入地质剖面分析中，从信号分析的角度，把同一地区不同时代剖面线分别看作一维连续的空间域信号，并对其傅里叶变换后频谱进行分析研究，也可以借助自仿射分形模型，依托于功率谱来计算不同时代剖面线的分维值。对不同时代剖面线的频谱分析，可得到相应剖面线所包含的频率信息，并可以实现不同时代地质剖面线的数学表达。对比分析同一地区不同时代剖面的频谱，探究不同时代剖面线频谱特点。本文以南海西沙群岛局部剖面为例，分别对相同地段的海底、上新世、晚中新世、中中新世、早中新世、基底界面及相邻界面间厚度进行了频率域上的对比分析，发现不同时代剖面线在频率域整体趋势上存在一定的相似性，相对低频成分相似性影响贯穿各个时代，相对高频成分不同时代剖面线存在差异。不同时代剖面线的分维值各不相同，总体呈现单增趋势。这些频谱和分维值特点与西沙地区渐趋稳定的构造背景相对应，表明西沙海域地貌将以较为平稳的趋势发育。
장수자신호분석중상용적부리협변환인입지질부면분석중，종신호분석적각도，파동일지구불동시대부면선분별간작일유련속적공간역신호，병대기부리협변환후빈보진행분석연구，야가이차조자방사분형모형，의탁우공솔보래계산불동시대부면선적분유치。대불동시대부면선적빈보분석，가득도상응부면선소포함적빈솔신식，병가이실현불동시대지질부면선적수학표체。대비분석동일지구불동시대부면적빈보，탐구불동시대부면선빈보특점。본문이남해서사군도국부부면위례，분별대상동지단적해저、상신세、만중신세、중중신세、조중신세、기저계면급상린계면간후도진행료빈솔역상적대비분석，발현불동시대부면선재빈솔역정체추세상존재일정적상사성，상대저빈성분상사성영향관천각개시대，상대고빈성분불동시대부면선존재차이。불동시대부면선적분유치각불상동，총체정현단증추세。저사빈보화분유치특점여서사지구점추은정적구조배경상대응，표명서사해역지모장이교위평은적추세발육。
Each section line of a certain period in a geological profile is a continuous and unidimensional signal in space. The frequency spectrum of this signal can be obtained by using the Fourier Transform. In addition, fractal dimension of the section line can be calculated according the self- affine fractal model. Through the analysis of the frequency spectrum and fractal dimension of different section lines at different ages, more geological information will be presented and revealed. In this paper, a seismic reflection profile from Xisha Island of the South China Sea was taken as an example. Section lines of the sea floor, Pliocene, Late Miocene, Middle Miocene, Early Miocene, and the basement were contrasted in the frequency spectrum by using the Fast Fourier Transform. Results showed that the frequency spectrum of these section lines was somewhat similar in trend, where the relatively low frequency component ran throughout all ages and major diversity was in the relatively high frequency components. Fractal dimension of the section lines varied in different ages, but presented a single-increasing trend. These characteristics in the frequency spectrum and fractal dimension, corresponding to the stable trend in tectonics of the Xisha Islands, indicated that the topography development in this area would be relatively stable.