【摘要】 可靠的震相走时是地震预警技术中精确测定震源位置和发震时刻的基础，本文运用STA/LTA震相识别技术，针对单台（河北红山台）2009-2021年共计12年积累的地震记录进行叠加计算，得到了红山台记录到的区域地震各震相走时曲线。结果显示，震中距0°～50°范围内红山台共成像7种震相的走时曲线，分别为P、S、PP、SS、PcS、ScS以及R面波震相，且随着组合参数变化，叠加成像的震相种类、震中距范围、清晰度均有所不同。此外，通过绘制各震相走时曲线发现，震中距0°～15°范围内，P波、S波及R波走时曲线基本呈线性变化，震中距0°～15°范围内计算得到红山台区域地震P波传播速度为7.5 km/s左右，S波传播速度为4.2 km/s左右，R波传播速度为3.5 km/s左右，介于P波和S波之间存在一个震相的走时痕迹，波速为5.4 km/s左右。本工作对于提升红山台震中距≤1 000 km的地震预警定位精度有指导意义。更多还原

【Abstract】 Reliable seismic phase travel time plays a fundamental role in the accurate determination of source position and occurrence time in earthquake early warning technology. In this paper, the STA/LTA phase identification technology is used for the first time to stack the seismic records accumulated by a single station(Hebei Hongshan station) for 12 years from 2009 to 2021, and the travel time curves of each seismic phase recorded by Hongshan station are imaged. The results show that the travel time curves of seven known seismic phases in Hongshan station are P, S, PP, SS, PcS, ScS, and R surface wave phases in the range of 0° to 50° epicenter distance.With the change of combination parameters, the types of seismic phases, epicentral distance range, and definition of superimposed imaging are different. In addition, by drawing the travel time curves of each seismic phase, it is found that the travel time curves of P wave,S wave, and R wave basically change linearly within the epicenter distance of 0° to 15°. Within the epicenter distance of 0° to15°, it is calculated that the seismic P-wave propagation velocity in Hongshantai area is about 7.5 km/s, S-wave propagation velocity is about 4.2km/s and R-wave propagation velocity is about 3.5 km/s. There is a trace of seismic phase travel time between P wave and S wave, and the wave propagation velocity is about 5.4 km/s.更多还原