The Source Phenomenology Experiment (SPE‐Arizona) included of a series of chemical explosions detonated within a copper mine in Arizona. This study focuses on ground motions from detonations in the copper mine, which are analyzed to assess the uniqueness of the resulting source representation when the source region propagation characteristics have a range of possible models. P‐wave velocities are well constrained by refraction data with less constraint of the S‐wave velocities. The effects of explosion source depth and VS are assessed with Green’s functions for a range of models in which VP is held constant. Propagation models with a Poisson’s value of 0.25 and a source depth 30–60 m most accurately replicate the data. The explosion was detonated at a centroid depth of 30 m, so trade‐offs in depth are demonstrated. The compensated linear vector dipole and explosion components of the Green’s functions convolved with a Mueller–Murphy source function are compared. Both produce significant energy in the 2–12 Hz band, due to surface‐wave contributions with no clear depth dependencies above 20 Hz. The range of propagation models is used with the observational data to invert for the frequency‐domain moment tensor. Fits to the data from these inversions have cross‐correlation values of 0.64, demonstrating effectiveness in replicating the observations with the assumed propagation path effects and resulting source function. Inversions produce horizontal dipoles (⁠Mxx and Myy⁠), roughly half the maximum amplitude of Mzz⁠, consistent with a compensated linear vector dipole source, which is frequency dependent. Denny and Johnson, Mueller–Murphy, Walter and Ford, and the revised Mueller–Murphy source models, parameterized for granite, are compared to the moment tensors. Despite a nonisotropic moment tensor source, the revised Mueller–Murphy isotropic source model best replicates the long‐period moments, overshoot, and corner frequency.

中文翻译：

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假定的源深度和剪切波速对估计的花岗岩中小的含化学爆炸矩矩张量的影响

源现象学实验（SPE-Arizona）包括一系列在亚利桑那州的铜矿中引爆的化学爆炸。这项研究的重点是铜矿中爆炸产生的地震动，当震源区域的传播特性具有一系列可能的模型时，对震源的地震动进行分析，以评估震源表示的唯一性。P波速度受到折射数据的很好约束，而对S波速度的约束较小。爆炸源深度和VS的影响是通过Green函数评估的，其中VP保持恒定。泊松值为0.25且源深度为30–60 m的传播模型可以最准确地复制数据。爆炸在质心深度30 m处引爆，因此证明了在深度上的取舍。比较了格林函数与Mueller-Murphy源函数卷积后的补偿线性矢量偶极子和爆炸分量。由于表面波的作用，在20Hz以上都没有明显的深度依赖性，因此两者都在2-12Hz的频带中产生大量能量。传播模型的范围与观测数据一起用于频域矩张量的反演。来自这些反演的数据的拟合具有0.64的互相关值，证明了在假定传播路径效应和所得源函数的条件下复制观测值的有效性。反向产生水平偶极子（⁠Mxx和Myy⁠），大约是Mzz⁠最大振幅的一半，这与频率相关的补偿线性矢量偶极子源一致。丹尼和约翰逊，穆勒-墨菲，沃尔特和福特，然后将针对花岗岩参数化的修改后的Mueller-Murphy源模型与弯矩张量进行比较。尽管存在非各向同性的矩张量源，修订后的Mueller-Murphy各向同性源模型最好地复制了长周期矩，超调量和转角频率。