Shale Hills Critical Zone Observatory 3D Seismic Experiment

In the project we would like to use all 2100 Texans with vertical geophones to do a dense deployment across about 1/4 of the Shale Hills Critical Zone Observatory, which is located a few miles from Penn State University. Stations will be spaced 2 to 5 m apart. Hammer and shotgun sources will be used and spaced a few meters apart over the entire survey area. Shot timing will be provided by Verif-I gps synchronizers (Galen tells me that he has several). Shooting will be done in one day, with data being recorded continuously. The data will be used for a 3D P-wave tomography of the shallow subsurface. After collecting the active source data, the Texans will be redeployed to record ambient noise for a couple of days. Some of the Texans will also be used with 3-component (L-28s) sensors to collect a few dense 2D profiles for S-wave tomography after the 3D survey has been completed.本项目计划使用全部2100台搭载垂直检波器的Texans设备，在距离宾夕法尼亚州立大学数英里的页岩山丘关键带观测站（Shale Hills Critical Zone Observatory）约四分之一的区域开展高密度布设。台站间距设定为2至5米。本次勘探将采用锤击与气枪作为震源，在整个调查区域内按数米间距布置震源。震源触发时刻将通过Verif-I型GPS同步器（Verif-I GPS Synchronizers）实现同步（Galen告知其手中拥有多台此类设备）。数据采集工作将在单日完成，且全程连续记录。所获取的数据将用于浅地表三维P波层析成像研究。完成主动源数据采集后，将对Texans设备进行重新部署，开展为期数天的环境噪声记录工作。三维勘探任务完成后，部分Texans设备还将搭配三分量（L-28型）传感器，采集若干高密度二维剖面数据，以开展S波层析成像研究。