Brady Hot Springs geothermal field has exhibited subsidence, as measured by interferometric synthetic aperture radar (InSAR). Previous studies have examined both the temporal evolution of the deformation from 2004 through 2016 and the spatial extent of the deformation, directly relating the observed subsidence to volumetric changes below the surface. We extend the modeling at Brady to analyze a data set of interferometric pairs spanning from the end of 2003 through 2018. We examine spatial and temporal trends in the observed deformation by time‐series analysis of each of the 1,656 cubic voxels in a parameterized elastic dislocation model to identify areas where the subsurface volume changes as a function of time. Joint time‐series analysis of Global Positioning System and InSAR pairs confirm significant changes in rates of volume change during time intervals when well operations were varied. The rate of subsidence increases with increased injection, consistent with the identification of thermal contraction of the rock matrix as the dominant driving mechanism. Conversely, the modeled volume increases when pumping ceases, suggesting thermal expansion of the rock matrix.

中文翻译：

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美国内华达州布雷迪温泉的体积变化的时间序列分析，使用2003-2018年的大地测量数据

用干涉合成孔径雷达（InSAR）测量，布雷迪温泉地热场已出现沉降。先前的研究既检查了2004年至2016年变形的时间演变，也考察了变形的空间范围，将观测到的沉陷与地表以下的体积变化直接相关。我们扩展了布雷迪（Brady）的模型，以分析从2003年底到2018年的干涉对数据集。我们通过对时间序列分析检查了变形的时空趋势，方法是对参数化弹性位错中的1,656立方像素中的每一个进行时间序列分析模型以识别地下体积随时间变化的区域。全球定位系统和InSAR对的时间序列联合分析证实，在改变井作业的时间间隔内，体积变化率发生了显着变化。沉降速率随注入量的增加而增加，这与确定岩石基质的热收缩为主要驱动机制相一致。相反，当停止抽水时，模型化的体积会增加，表明岩石基质的热膨胀。