Spectral analysis is widely used to estimate and refine earthquake source parameters such as source radius, seismic moment, and stress drop. This study aims to quantify the precision of the single spectra and empirical Green's function spectral ratio approach using the Large‐n Seismic Survey in Oklahoma (LASSO) array. The dense station coverage in an area of local saltwater disposal offers a unique opportunity to observe and quantify radiation pattern effects and subsequent precision of spectral estimates of small earthquakes (M < 3). The results suggest that the precision of source properties estimated from direct phase arrivals for arrays with less than 20 stations should be assumed to be not less than 30% and could be as high as 150% if less than five stations are used. Furthermore, we do not see clear evidence for, or against, a scaling of stress drop with magnitude of small earthquakes (M < 3) as observed by other studies.

中文翻译：

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使用大n地震阵列探索频谱估计的稳健性

频谱分析被广泛用于估计和完善地震震源参数，例如震源半径，地震矩和应力降。本研究旨在使用俄克拉荷马州的大n地震勘探（LASSO）阵列来量化单光谱的精度和经验格林函数谱比方法。在局部咸水处置区域中密集的气象站覆盖范围提供了独特的机会来观察和量化辐射模式的影响以及小地震频谱估计的后续精度（M < 3）。结果表明，对于少于20个站点的阵列，从直接相位到达估计的源属性精度应假定不小于30％，如果使用少于五个站点，则可以高达150％。此外， 正如其他研究所观察到的那样，我们没有明显的证据支持或反对应力下降随小地震震级（M < 3）的变化。