人工振动场源下的被动源面波试验研究

传统的被动源面波测量过程中，因环境噪声过于均衡安静，造成高频信息缺失。为拓宽被动源面波信号的频带范围，在被动源面波连续测量过程中加载人工振动震源，具体采用直线排列的方式对马路边、废弃工厂内两个不同噪音水平的区域进行连续16 min的野外数据采集，人为地控制马路上、废弃工厂内的车辆进出等方式来观测不同噪音水平的面波数据，并对采集的数据分别应用空间自相关法（SPAC/ESPAC）进行分析。结果显示:相同位置同样的观测方式下，有车辆经过相比安静环境下采集的数据，面波频散曲线高频信息显著增加，因此，在通过人工加载振动震源的情况下，能够拓宽被动源面波的高频信息，提升浅部地层分辨率，此具有重要应用价值。 

Experimental study of passive source surface wave under artificial vibration field source

High frequency information is missing due to the excessive equalization and quietness of ambient noise in the traditional measurement of passive source surface wave. In order to broaden the frequency range of the signal of passive source surface wave， artificial vibration sources are loaded in the continuous measurement of passive source surface wave. The researchers use a linear array to observe two areas with different noise levels on the roadside and in an abandoned factory for 16 minutes. The spatial autocorrelation method（SPAC/ESPAC）is applied to the measured surface data of different ambient noise levels which are observed by controlling the vehicles on the road and in the abandoned factory. The results show that the high frequency information of the dispersion curve of surface significantly increases when vehicles passing by， compared to that of quiet environment under the same observation mode at the same position. Therefore， the author believes that the artificial loading of vibration source can broaden the high frequency information of passive source surface wave ， and it is significantly applicable to improve the resolution of shallow strata.