A generalized inversion technique (GIT) is applied to local seismic data from 90 induced earthquakes (⁠ML 2.0–3.9) in the Fort Worth Basin (FWB) of north Texas to separate path, site, and source characteristics and to improve local seismic hazard assessment. Seismograms from three earthquake sequences on spatially separated basement faults are recorded on 66 temporary stations. Because of the lack of hard‐rock recording sites within the sedimentary basin, we developed a site correction method for the appropriate GIT process. At about 30 km distance from the hypocenters, we observed a change in spectral attenuation and thus focus data analysis within this distance range. The estimated quality factors for S and P waves result in a QS that is larger than QP which we interpret as a result of concentrations of crustal pore fluids or partial fluid‐saturated material along the path; an interpretation consistent with fluid‐rich sedimentary rocks in the FWB. Strong site amplifications as much as five times on horizontal components reflect the thick sediments in the basin. A limited number of sites exhibit amplification or deamplification on the vertical component that limits the use of horizontal‐to‐vertical spectral ratio methods for characterizing the site effect relative to the site effects estimated by GIT. Stress drops for all earthquakes range from 1.18 and 21.73 MPa with a mean of 4.46 MPa, similar to values reported for tectonic intraplate events. The stress‐drop values suggest that strong motion and seismic hazard from the injection‐induced earthquake in the FWB are comparable to those for tectonic earthquakes. The strong site amplification and fluid effects on propagation attenuation may be crucial factors to take into account for estimating seismic hazards of induced earthquakes in sedimentary basins.

中文翻译：

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使用广义反演技术的德克萨斯州沃思堡盆地地震诱发的地震动的频谱特征

将通用反演技术（GIT）应用于德克萨斯州北部沃思堡盆地（FWB）的90次诱发地震（​​ML 2.0–3.9）的局部地震数据，以分离路径，站点和震源特征，并改善局部地震危害评定。在66个临时站上记录了空间分隔的地下断层上三个地震序列的地震图。由于沉积盆地内缺乏硬岩记录位点，我们针对适当的GIT过程开发了位点校正方法。在距震源约30 km的距离处，我们观察到光谱衰减的变化，因此在此距离范围内进行了焦点数据分析。估计的S波和P波品质因数导致QS大于QP，我们将其解释为沿路径中地壳孔隙流体或部分流体饱和物质的浓度；这种解释与FWB中富含流体的沉积岩相一致。水平分量上的强位放大多达5倍，反映了盆地中厚厚的沉积物。有限数量的位点在垂直分量上表现出放大或去放大作用，这限制了使用水平-垂直光谱比方法来表征相对于GIT估计的位点效应的位点效应。所有地震的应力下降范围为1.18 MPa和21.73 MPa，平均为4.46 MPa，与构造板内事件报道的值相似。应力降值表明FWB中注入诱发的地震的强烈运动和地震危险与构造地震的相当。在估算沉积盆地诱发地震的地震危害时，强烈的场地放大作用和流体对传播衰减的影响可能是至关重要的因素。