分布式光纤声波传感系统记录的交通噪声的干涉处理分析

分布式光纤声波传感系统(DAS)是近年来迅速发展的高密度、低成本的地震观测设备,已经在基于面波的速度层析反演、反射成像、微地震监测等多个领域显示巨大潜力.本文基于美国加利福尼亚州Garner Valley实验中DAS记录的交通噪声数据,分析交通噪声数据特点,并利用地震干涉方法从交通噪声记录提取出近地表传播的面波信息.结...

Seismic interferometry for traffic noise recorded by a distributed acoustic sensing system

Distributed acoustic sensing (DAS) system is a recently developed low-cost high-density seismic acquisition instrument and has demonstrated remarkable potential in various fields including surface wave tomography, reflection imaging, and microseismic monitoring. With the traffic noise data record with a DAS system in Garner Valley in California USA, the characteristics of DAS traffic noise are analyzed, and surface wave data are extracted from the traffic noise using seismic interferometry. It has been demonstrated that using a DAS traffic noise record with only 6 seconds record length, surface wave data can be extracted with comparable signal quality to active source data. Also, three interferometric algorithms, cross-correlation, deconvolution, and crosscoherence interferometry are compared using this traffic noise dataset. The comparison indicates crosscoherence and crosscorrelation interferometry results show the optimal signal-to-noise ratio, and crosscoherence and deconvolution interferometry results demonstrate wider frequency bandwidth.