摘要
小波分析方法用于地震宽角反折射资料处理 ,它可将地震信号的分辨率由传统的1 /2— 1 /4λ(波长 )提高到优于 1 /6λ .利用小波分析方法对沙雅—布尔津地震宽角反折射剖面资料进行处理 ,发现天山造山带的壳幔过渡带由 7— 8个高低速相间的薄层构成 ,平均速度较低 ,总厚度约 2 0km .而塔里木盆地北缘与准噶尔盆地的壳幔过渡带不具有这一特点 ,壳幔间主要以一级间断面实现过渡 .天山造山带与准噶尔盆地壳幔过渡带详细结构及其二者之间的差异特征为天山造山带地球动力学“层间插入消减模型”
In this paper, the general principle of the wavelet transform has been introduced and the wavelet transform has been applied to the data processing of seismic reflection/refraction profile with a set of related programs developed by us. The research shows that the wavelet transform is effective for the data processing. By modeling, we know that the resolution of the seismic signals can be improved from 1/2—1/4 wavelength to better than 1/6 wavelength. Using wavelet transform to the data obtained from Xayar Burjing geoscience transect, we have obtained a detailed structure of the crust mantle transitional zone which is composed of 7—8 thin layers of high and low velocity alternatively with low average velocity and total thickness of 20 km. The crust mantle transitional zones of the northern margin of the Tarim basin and the Junggar basin do not possess this feature. They are completed mainly by first order discontinuity. The detailed structure of the Tianshan orogenic belt and the Junggar basin and their differences provide an important evidence for the model“Lithospheric Subduction with Intrusion Layers in Crust” of the Tianshan orogenic belt. [
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第5期666-676,共11页
Chinese Journal of Geophysics
基金
国家 30 5项目
国家 973课题!(G1 9990 4 330 1 )
关键词
小波变换
地震宽角反折射
分辨率
壳幔过渡带
Wavelet transform, Seismic wide angle reflection/refraction, Resolution, Crust mantle transitional zone, Geodynamics.
