基于频率-贝塞尔变换法的关东盆地S波速度成像

将一种新的方法——频率-贝塞尔变换法（F-Jmethod）应用于日本NIED在关东盆地布设的MeSO-net台网的背景噪声数据中，证明频率-贝塞尔变换法可以有效地从背景噪声中提取高阶频散曲线.利用提取的基阶和高阶频散曲线反演关东盆地区域的沉积层和地震基岩层的S波速度结构，并将我们反演得到的S波速度结构与Koketsu等提出的日本综合速度结构模型进行对比讨论.我们的例子证明，在基阶面波的基础上，高阶面波能减少在反演中的非唯一性，得到更为准确的S波速度结构.

S-wave velocity imaging of the Kanto basin in Japan using the frequency-Bessel transformation method

We applied a new method, the Frequency-Bessel transformation method (F-J method), to the ambient noise data of MeSO-net which is run by National Institute for Earth Science and Disaster Resilience (NIED). The F-J method can extract fundamental-mode dispersion curves and higher-mode dispersion curves from ambient noise effectively. We inverted for the S-wave velocity structure using fundamental-mode and higher-mode dispersion curves and compared our models with JIVSM. Our example shows that using higher-mode dispersion curves on the basis of fundamental-mode dispersion curves can reduce nonuniqueness in inversion and allow us to obtain more precise S-wave velocity structure.