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Significant Effects of Shallow Seismic and Stress Properties on Phase Velocities of Rayleigh Waves Up to 20s

机译：浅层地震和应力特性对瑞利波相速度的显着影响高达20S

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摘要

Seismic data are increasingly used to monitor subsurface velocity changes associated with tectonic and environmental processes that occur in different depth sections. To clarify the differences between effects associated with shallow and deep changes of properties, we conduct numerical experiments using simple layered models that include low velocities, low attenuation coefficients and stress-sensitivity of cracked rocks in the shallow crust. We find significant phase-velocity drops in the period range of 5-20s when large structural changes occur in the top 1-3km. The apparent velocity changes (v/v) measured from the first part of the synthetic Rayleigh waves with a cross-correlation based technique show significant velocity drops in the period bands of 5-10s and 10-20s that are consistent with reported values of changes at seismogenic depth. The results highlight the importance of accounting for low velocities, attenuation coefficients and stress-sensitivity of parameters in the top 1-3km in studies aiming to determine the source region of temporal changes. Analyses using different frequency ranges and calculations of apparent delay times over multiple period bands are essential for resolving the depth range of temporal changes of properties. For temporal changes occurring at seismogenic depths, the measured v/v values at 5-10s are significantly larger than those of 10-20s, which are not observed for shallow changes.
机译：地震数据越来越多地用于监测与不同深度部分中发生的构造和环境过程相关的地下速度变化。为了阐明与浅层和深度变化的浅层变化相关的效果之间的差异，我们使用简单的分层模型进行数值实验，该模型包括低速度，低衰减系数和浅地壳中裂纹岩石的应力敏感性。当大型结构变化发生在1-3公里时，我们在5-20s的周期范围内发现显着的阶段速度下降。从合成的瑞利波的第一部分测量的表观速度变化（v / v）具有基于互相关的技术，在5-10s和10-20s的周期带中显示出显着的速度下降，这与报告的变化值一致在发震深度。结果突出了旨在确定旨在确定时间变化源区域的研究中的低速度，衰减系数，参数的低速度，衰减系数和应力敏感性的重要性。使用不同频率范围的分析和在多个时段带上的表观延迟时间的计算对于解决性能的时间变化的深度范围是必不可少的。对于在发震深度发生的时间变化，5-10s的测量v / v值显着大于10-20s的值，这对于浅层变化而言未观察到。

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