Surface-Wave Data Products from USArray

该项目将使用USArray可移动阵列在美国48个州部署的10年地震台站的数据，绘制地壳顶部100公里和大陆下方浅层地幔的地震学特性。该项目的重点是利用传统和现代方法对地震表面波进行综合分析，包括对环境地震噪声的分析，环境地震噪声是由人类活动、海浪和风等大气现象引起的地震波。该项目将生成地壳和地幔中岩石不同属性的高分辨率地图，这将有助于在整个大陆范围内解释北美的结构和构造演化。分布在整个大陆的近2000个传感器收集的地震数据将用于确定(1)利用地震噪声的站间互相关绘制的短周期（5-40秒）Love和Rayleigh波速图；(2)利用双站和微型阵列技术绘制长周期（25-125秒）Love和Rayleigh波速图；(3)利用差幅技术在较长周期内绘制局部弹性瑞利波放大图。将数据与基于模型的预测进行定量比较，以证明不同研究人员的结果之间的一致性，并确定促使进一步研究的差异。

The project will use data from the 10-year deployment of the seismic stations in the USArray Transportable Array across the lower 48 states to map seismological properties of the top 100 km of the crust and shallow mantle beneath the continent. The focus of the project is a comprehensive analysis of seismic surface waves using traditional and modern methods, including the analysis of ambient seismic noise, which are seismic waves caused by human activity, ocean waves, and atmospheric phenomena such as wind. The project will generate high-resolution maps of different properties of the rocks in the crust and mantle that will facilitate continent-wide interpretation of the structure and tectonic evolution of North America.The seismic data collected by nearly 2000 sensors distributed across the continent will be used to determine (1) maps of short-period (5-40 sec) Love and Rayleigh wave speed using inter-station cross correlation of seismic noise; (2) maps of longer-period (25-125 sec) Love and Rayleigh wave speed using two-station and mini-array techniques; and (3) maps of local elastic Rayleigh wave amplification at longer periods using a differential-amplitude technique. Quantitative comparisons of the data with model-based predictions will be used to demonstrate the consistency between results of different researchers, and identify differences that motivate further investigation.