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Travel-times and Attenuation Relations for Regional Phases in the Barents Sea Region

机译：巴伦支海地区各区域阶段的旅行时间和衰减关系

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摘要

A database containing 45 events in the Barents Sea region has been compiled and analyzed with the aim of evaluating crustal models, travel-times and attenuation relations in the context of performing regional detection threshold monitoring of this region. The 45 events are mostly located around the circumference of the study area due to the virtually aseismic nature of the Barents Sea itself. Regional P_n and S_n phases were observable for most events in the database, while P_g and L_g phases were only observable for events with raypaths that do not cross the tectonic structures in the Barents Sea. This corroborates a number of previous observations of L_g -wave blockage within the Barents Sea. Three existing velocity models were evaluated, with a model having slightly lower S velocities than earlier assumed in the upper mantle giving the overall best fit to the observed arrivals. In order to estimate magnitudes, short-term average (STA) and spectral amplitude values were calculated in several frequency bands for all phase arrivals in the database. There were no significant differences between spectral and STA amplitudes, so the latter were used as this parameter is more efficient to calculate in real-time processing. An inversion was performed in order to determine an attenuation relation specific for this region. The resulting magnitudes based on P_n , P_g , S_n and L_g phases gave an internally consistent, reasonably stable set of values, which can be calibrated towards any existing global or regional scale.
机译：已汇编并分析了一个包含巴伦支海地区45个事件的数据库，目的是在对该区域执行区域探测阈值监测的情况下评估地壳模型，传播时间和衰减关系。由于巴伦支海本身的抗震性质，这45个事件大多位于研究区域的周围。对于数据库中的大多数事件，可以观察到区域P_n和S_n阶段，而对于只有射线路径不穿越巴伦支海构造结构的事件，可以观察到P_g和L_g阶段。这证实了先前在巴伦支海中发生的L_g波阻塞的一些观测结果。对三个现有的速度模型进行了评估，该模型的S速度比上地幔中早先假设的S速度略低，从而使整体速度最适合观测到的到达。为了估计幅度，在数据库中所有相位到达的几个频带中计算了短期平均值（STA）和频谱幅度值。频谱幅度和STA幅度之间没有显着差异，因此使用后者，因为此参数在实时处理中更有效地进行计算。为了确定特定于该区域的衰减关系，进行了反转。基于P_n，P_g，S_n和L_g相位得出的幅度给出了内部一致，合理稳定的一组值，可以针对任何现有的全球或区域范围进行校准。

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