In this study, we derive the characteristics of high-frequency attenuation and excitation of ground motion for the Dead Sea Basin (DSB) area by regressing the peak amplitudes of narrowband-filtered velocity seismograms measured around the shear wave arrivals. We analyzed about 2000 seismograms from 43 local earthquakes in the magnitude range of M_W = 0.9–4.5 that occurred in and around the DSB. The regional crustal attenuation is modeled with a frequency-independent piece-wise continuous linear geometrical spreading function and a frequency-dependent quality parameter Q. Our analysis exhibits that S wave attenuation in the DSB has irregular behavior with the effects of arrivals of supercritical reflections. For distances r ≤ 20 km, the geometrical spreading is 1/r; for distances r ≥ 40 km, the geometric attenuation is r^−0.4; and for distances 20 < r <40 km, it is r^−0.5. The quality parameter Q is modeled as Q = 68f^0.5. The excitation is modeled using the proposed propagation model, increasing stress drop and a high-frequency roll-off parameter κ = 0.03 s. To model the theoretical excitation, we use stress drop values ∆σ = 3 ΜPa, ∆σ = 4 ΜPa, ∆σ = 8 ΜPa, and ∆σ = 9 MPa for earthquakes of M_W = 3, M_W = 3.3, M_W = 4, and M_W = 4.5 and site amplification factor of 3. Applying the extended coda normalization method to earthquakes in the DSB area provides quality factors for S and P waves of Qs =80f^0.81 and Q_P = 41f^0.84 and Q_S/Q_P ratio varying in the range of 1.7–2.9. Anisotropy of seismic wave attenuation in the DSB area is observed. The main direction of anisotropy N20° (110°) is determined based on the model of two orthogonal components producing maximum separation of the attenuation function values.

中文翻译：

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死海盆地高频衰减特征

在这项研究中，我们通过对剪切波波到达附近测得的窄带滤波速度地震图的峰值进行回归，得出死海盆地（DSB）地区的高频衰减和地震动激发的特征。我们分析了 在DSB内部和周围发生的M _W = 0.9-4.5范围内的43次局部地震中的大约2000幅地震图。利用与频率无关的分段连续线性几何扩展函数和与频率有关的质量参数Q对区域地壳衰减建模。我们的分析表明，DSB中的S波衰减在超临界反射波到来的影响下具有不规则行为。对于距离r ≤20 km，几何扩展为1 / r；对于距离ř  ≥40公里，几何衰减是- [R ^-0.4 ; 对于20 <  r  <40 km的距离，则为r ^-0.5。质量参数Q建模为Q  = 68 f ^0.5。使用建议的传播模型，增加的应力降和高频滚降参数κ  = 0.03 s对激励进行建模。为了模拟的理论激发，我们使用应力降值Δ σ  = 3ΜPa，Δ σ  = 4ΜPa，Δ σ  = 8ΜPa，和Δ σM _W  = 3，M _W  = 3.3，M _W  = 4和M _W  = 4.5且地点放大系数为3的 地震= 9 MPa 。将扩展尾声归一化方法应用于DSB地区的地震可提供S的品质因数和的P波Q S = 80 ˚F ^0.81和Q _P  = 41 ˚F ^0.84和Q_小号/ Q _P比率在1.7-2.9之间变化。观察到DSB区域地震波衰减的各向异性。各向异性的主方向N20°（110°）基于两个正交分量的模型确定，该模型产生衰减函数值的最大分离。