基于S变换的高频全球导航卫星系统同震数据的震相识别研究

Seismic phase recognition of coseismic data from high-rate GNSS based on S transform

摘要: 为研究高频全球导航卫星系统（GNSS）信号的P波和S波到时，本文利用2008年汶川M_S8.0地震震时部分站点记录到的1 Hz高频GNSS数据，采用广义S变换将同震信号进行二维时频域平面分解，以此对P波和S波到时进行识别。本文通过调整广义S变换中的调节因子λ_a和p得出，当λ_a＝1.05，p＝1.05时，变换所得图像中的P波和S波到时均较为明显。结果表明，S变换在高频GNSS震相识别中效果明显，可作为GNSS地震学应用中一项有效的技术手段。

Abstract: The high-rate GNSS data recorded by some stations during the 2008 Wenchuan M_S8.0 earthquake was used in this paper to identify the arrive time of P-wave and S-wave in 1 Hzhigh-rate GNSS. Coseismic signals are decomposed in two-dimensional time-frequency domain using generalized S transform. The adjustment factors λ_a＝1.05, p＝1.05 is used to identify the arrival times of P-wave and S-wave, which could get a better result. The S transform is effec-tive and feasible in the high-rate GNSS seismic phase recognition.