Collaborataive Research: Field demonstration of utilit of NEES vibrator to work with IRIS equipment pool to meet Earthscope science objectives for crustal-structure and earthquake

小乔治·E·布朗。地震工程模拟网络(NEES)是由美国国家科学基金会工程局资助的一个重大研究设备项目。NEES的主要现场实验和监测装置之一是大型移动振动器(地震振动器)和相关仪器，用于由Stokoe、Rathje和Wilson教授在德克萨斯大学奥斯汀分校操作的岩土和结构系统的动态现场研究。地球望远镜是美国国家科学基金会地球科学委员会资助的最大的重大研究设备项目。因此，它将是未来十年影响美国大多数学术地球科学家的旗舰项目，并将促进我们对北美大陆的结构、演化和动力学的理解。这一示范项目将试图展示NEES可控震源与IRIS-PASSCAL运营的国家地震仪器池一起用于高分辨率反射成像(用于减少地震灾害和其他项目)、地壳深反射和折射剖面图(用于地镜大陆结构项目)和横波地壳剖面图以测量各向异性(用于地震性能分析的沉积物中流体的物理性质测量，直到了解大陆动力学所需的地壳深部应变模式)。演示拟在现有地球望远镜感兴趣的地理区域进行，并在地球望远镜科学资助的第一年为研究提供资金。我们的演示将以现有地球望远镜设施不可能实现的方式解决地球望远镜的主要科学目标。地球望远镜实验的美国阵列组件是一个大陆规模的地震观测站，旨在为在广泛范围内综合研究大陆岩石圈和地球深层结构提供基础。美国地震台阵设施将由三个主要地震部件组成，其中一个是400台便携式、三分量、短周期和宽带地震仪(“柔性阵列”)的灵活部件，这些地震仪由2000个单通道高频记录器组成，用于主动和被动震源研究，这将增强可移动的宽带被动地震台阵。目前，地镜规划中的一个主要缺陷是不容易获得活跃的震源。如果我们的测试成功，NEES可控震源可以帮助填补这一空白。

The George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) is a Major Research Equipment project funded through the Engineering Directorate of NSF. One of NEES' major field experimentation and monitoring installations is the large-scale mobile shakers (seismic vibrators) and associated instrumentation for dynamic field studies of geotechnical and structural systems operated at UT Austin by Professors Stokoe, Rathje and Wilson. EarthScope is the largest Major Research Equipment project ever funded in the Geosciences Directorate of NSF. As such, it will be the flagship project affecting the majority of academic geoscientists in the USA for the next decade, and will advance our understanding of the structure, evolution and dynamics of the North American continent. This demonstration project will attempt to demonstrate the utility of the NEES vibrators in conjunction with the national seismic instrumentation pool operated by IRIS-PASSCAL, for high-resolution reflection imaging (for earthquake-hazard reduction and other projects), crustal deep reflection and refraction profiling (for Earthscope continental structure projects), and shear-wave crustal profiling to measure anisotropy (for physical property measurements of fluids in sediments for seismic performance analysis, up to strain patterns in the deep crust needed to understand the dynamics of the continents). The demonstration is proposed to be in a geographic area of existing Earthscope interest, funded for study in the first year of EarthScope science funding. Our demonstration will address primary science objectives of Earthscope in ways not possible with existing Earthscope facilities.The USArray component of the EarthScope experiment is a continental-scale seismic observatory designed to provide a foundation for integrated studies of continental lithosphere and deep Earth structure over a wide range of scales. The USArray facility will consist of three major seismic components, of which one is a flexible component of 400 portable, three-component, short-period and broadband seismographs ("Flexarray") of 2000 single-channel high frequency recorders for active and passive source studies that will augment the transportable broadband passive seismic array. Currently, a major gap in Earthscope planning is that there is no easy access to active seismic sources. This is a gap that the NEES vibrators can help fill - if our test is successful.