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中国东北地区噪声层析成像

DOI: 10.6038/cjg20140311, PP. 812-821

Keywords: 中国东北,噪声成像,瑞雷波,群速度,相速度

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Abstract:

中国东北地区是中国唯一的深震孕育区,获取该区的壳幔结构,对于研究板块俯冲、深震以及火山活动等有重要的科学意义.本文利用该区159个固定台站2011年1月至2012年6月和27个流动台站2011年1月至2011年6月间的垂向波形连续记录,计算了台站间的预估格林函数,并采用基于连续小波变换的时频分析方法,测量了双台路径上瑞雷波的群速度和相速度频散曲线.通过质量控制和筛选,最终得到了2204条路径上周期5~40s的群/相速度频散曲线.检测板测试表明,反演结果可以达到2°×2°的分辨.利用Ditmar&Yanovskaya反演方法,我们得到了研究区(105°E—135°E,39°N—52°N)周期8~30s的瑞雷波的群速度和相速度分布图.不同周期的群/相速度分布图,反映了不同深度S波速度的横向变化情况.研究结果显示:中国东北地区的地壳上地幔S波速度结构存在横向非均匀性.短周期(如8s)的群/相速度分布与地表地质构造具有明显的相关性,具体来说,山区显示为高速,沉积盆地显示为低速;随着周期的增大(如15s,22s),地形的控制作用相对减弱;较长周期(如30s)的群/相速度分布与地壳厚度密切相关.

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