Combined effects of deterministic and statistical structure on high-frequency regional seismograms
Combined effects of deterministic and statistical structure on high-frequency regional seismograms
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确定性和统计结构对高频区域地震图的综合影响
DOI：
10.1093/gji/ggx219
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发表时间：
2017
影响因子：
2.8
通讯作者：
M. Fitzpatrick
中科院分区：
文献类型：
--
作者：
C. Sanborn;V. Cormier;M. Fitzpatrick
辐射传输建模可以结合大尺度（确定性）和小尺度（统计）结构对高频区域地震图尾波包络的影响。我们描述了一种用于实现辐射传输建模的计算机代码，该模型通过大规模确定性 3D 结构沿着射线路径传播地震体波能量包，包括速度梯度、固有衰减、源辐射方向图和层边界的多重散射以及异质性谱指定的小尺度异质性的影响。这些能量包的空间分布可以显示为时间快照，以帮助理解区域相位传播，或者通过在接收器箱处求和而显示为尾波包络。这些技术应用于中国罗布泊地区记录的地震和爆炸，以模拟观测到的 1-4 Hz 频带内的窄带通过地震尾波。我们预测，该区域基于 P/L 振幅比的源判别器将最好地分离频率为 2 Hz 及更高的地震和爆炸群体。
Radiative transport modelling can combine the effects of both large-scale (deterministic) and the small-scale (statistical) structure on the coda envelopes of high-frequency regional seismograms. We describe a computer code to implement radiative transport modelling that propagates packets of seismic body wave energy along ray paths through large-scale deterministic 3-D structure, including the effects of velocity gradients, intrinsic attenuation, source radiation pattern and multiple scattering by layer boundaries and small-scale heterogeneities specified by a heterogeneity spectrum. The spatial distribution of these energy packets can be displayed as time snapshots to aid in the understanding of regional phase propagation or displayed as a coda envelope by summing at receiver bins. These techniques are applied to earthquakes and explosions recorded in the Lop Nor, China region to model observed narrow band passed seismic codas in the 1–4 Hz band. We predict that source discriminants in this region based onP/Lgamplitude ratios will best separate earthquake and explosion populations at frequencies 2 Hz and higher.
影响因子：
16.6
作者：
D. L. Anderson
通讯作者：
D. L. Anderson