The teleseismic surface wave two-station method was applied to an ultra-dense array of short-period seismometers in Jinzhong City, Shanxi Province. After the teleseismic records were filtered and corrected for instrument responses, mid-frequency (5–15 s) surface wave signals were extracted. High signal-to-noise ratio records were selected through screening. The Rayleigh wave phases were extracted from the Z component, and average dispersion curves for station pairs were obtained. The S-wave velocity structure was subsequently inverted. The results demonstrate that appropriate filtering and cross-instrument response correction enable the extraction of mid-frequency Rayleigh wave phase velocities from short-period seismometer recordings. Although the observation period is extremely limited, the inverted S-wave velocity structure aligns well with local fault tectonics. This confirms that mid-frequency seismic signals derived from short-period instruments are viable for subsurface inversion via teleseismic surface waves.

将远震面波双台法应用于山西省晋中市短周期地震仪组成的超密集台阵。对远震记录进行滤波和仪器响应校正后, 提取出中频(5~15 s)面波信号, 通过筛选, 获取其中信噪比高的记录, 从Z分量截取瑞利波震相后, 获得台站对的平均频散曲线, 并反演S波速度结构。结果表明, 通过滤波及不同仪器间的仪器响应校正, 可以从短周期地震仪的记录中提取出中频瑞利面波相速度; 尽管观测时间短, 但反演得到的S波速度结构与当地断裂构造符合较好, 说明短周期地震仪提取的中频地震信号可用于远震面波地下结构的反演。