We analyze multimethod shear (SH)‐wave velocity (⁠VS⁠) site characterization data acquired at three permanent and 25 temporary seismograph stations in Oklahoma that recorded M 4+ earthquakes within a 50 km hypocentral distance of at least one of the 2016 M 5.1 Fairview, M 5.8 Pawnee, or M 5.0 Cushing earthquakes to better constrain earthquake ground‐motion modeling in the region. We acquired active‐source seismic data for time‐averaged VS to 30 m depth (⁠VS30⁠) at 28 seismograph stations near the Fairview, Pawnee, and Cushing epicentral areas. The SH‐wave refraction travel times coupled with Rayleigh‐ and Love‐wave phase velocity dispersion were extracted and modeled in a nonlinear least‐squares (L2) joint inversion to obtain a best‐fit 1D VS versus depth profile for each site. At a subset of sites where the preferred L2 inverse model did not optimally fit each of the Love, Rayleigh, and SH travel‐time datasets, we explore application of simulated annealing in a joint inversion to find a more global solution. VS30 values range from 262 to 807 m/s for the preferred measured (in situ) VS profiles, or National Earthquake Hazards Reduction Program (NEHRP) site class D to B, and are broadly comparable with estimates from previous data reports in the region. Site amplification estimates were calculated next from 1D SH transfer functions of the preferred VS profiles and then compared against observed horizontal‐to‐vertical spectral ratios (HVSRs) from nearby seismograph stations. We generally see good agreement between the predicted in situ model and the observed HVSR resonant frequencies, with nominal amplifications between 2 and 10 within the 2–15 Hz frequency band. Next, using 40 known in situ VS30 measurements in the region, we demonstrate that the in situ VS30 values improve the fit for selected suites of ground‐motion models (GMMs) for M 4+ earthquakes within a 50 km hypocentral distance when compared with proxy methods, arguing for future development of GMMs implementing in situ VS profiles.

中文翻译：

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多方法地表地震测量联合反演在俄克拉荷马州的剪切波速度场地表征：对美国中部地面运动预测的影响

我们分析了在俄克拉荷马州的三个永久和 25 个临时地震台站获得的多方法剪切 (SH)-波速度 (⁠VS⁠) 站点特征数据，这些数据记录了 2016 年 M 5.1 中至少一个震源距离内的 50 公里震源距离内发生的 M 4+ 地震Fairview、M 5.8 Pawnee 或 M 5.0 Cushing 地震以更好地限制该地区的地震地面运动建模。我们在 Fairview、Pawnee 和 Cushing 震中区附近的 28 个地震仪台站获取了时间平均 VS 到 30 m 深度 (⁠VS30⁠) 的活动源地震数据。在非线性最小二乘 (L2) 联合反演中提取和建模 SH 波折射走时与瑞利波和洛夫波相速度色散，以获得每个站点的最佳拟合 1D VS 与深度剖面。在首选的 L2 反演模型没有最佳拟合 Love、Rayleigh 和 SH 旅行时间数据集的站点子集，我们探索了模拟退火在联合反演中的应用，以找到更全局的解决方案。对于首选的测量（原位）VS 剖面或国家地震灾害减少计划 (NEHRP) 站点 D 到 B 级，VS30 值范围从 262 到 807 m/s，并且与该地区先前数据报告的估计值具有广泛可比性。接下来根据首选 VS 剖面的 1D SH 传递函数计算站点放大估计，然后与从附近地震台站观察到的水平垂直光谱比 (HVSR) 进行比较。我们通常看到预测的原位模型与观察到的 HVSR 共振频率之间有很好的一致性，在 2–15 Hz 频带内标称放大率在 2 到 10 之间。接下来，我们使用该地区 40 个已知的原位 VS30 测量值，证明与代理相比，原位 VS30 值提高了对 50 公里震源距离内 M 4+ 地震的选定地面运动模型 (GMM) 套件的拟合。方法，为实现原位 VS 配置文件的 GMM 的未来发展而争论。