噪声层析成像在壳幔结构研究中的现状与展望

噪声层析成像是一门最近发展起来的新技术, 用环境噪声为数据研究地球结构, 摆脱了对震源信号的依赖。 由于噪声资料含有丰富的短周期信息, 噪声层析成像技术的应用, 大大提高了对地壳浅层结构的分辨能力, 并可有效用于城市地下结构的研究。 本文通过对噪声成像的发展现状、 计算方法和研究进展等几个方面的综述, 分析了噪声层析成像的优缺点, 对噪声层析成像技术的发展方向进行了展望。 噪声资料结合地震面波和体波反演的各向异性研究, 有助于更准确地揭示壳幔结构和深部动力特征。 综合运用噪声分析技术与其它有源信号的分析技术, 将会促进对壳幔地震学参数动态变化和地震前后的物性变化的研究探索。

Present State and Prospect of Ambient Noise Tomography in the Study of Crustmantle Structure

Ambient noise tomography is a rapidly emerging field of seismological research.Applying ambient noise to earth structure research can avoid dependence of earthquake signals effectively,meanwhile,ambient noise method can obtain upper crust structure with higher resolution as well as the structure beneath urban area because ambient noise contains abundant short period information.This paper aims to analysis advantages and disadvantages using ambient noise tomography by showing its present state,process method and progress.Anisotropy inverted by a combination of ambient noise data,surface and body waves can accurately reveal crust-mantle structure and geodynamic characteristics of deep structure.Combining noise analysis and other active signal analysis techniques can further study variations of seismological parameter and physical properties before and after earthquake.