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首页> 外文期刊>Pure and Applied Geophysics >An Evaluation of Coulomb Stress Changes from Earthquake Productivity Variations in the Western Gulf of Corinth, Greece
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An Evaluation of Coulomb Stress Changes from Earthquake Productivity Variations in the Western Gulf of Corinth, Greece

机译：从希腊科林斯湾西部地震生产力变化的库仑应力变化评估

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摘要

Spatial and temporal evolution of the stress field in the seismically active and well-monitored area of the western Gulf of Corinth, Greece, is investigated. The highly accurate and vast regional catalogues were used for inverting seismicity rate changes into stress variation using a rate/state-dependent friction model. After explicitly determining the physical quantities incorporated in the model (characteristic relaxation time, fault constitutive parameters, and reference seismicity rates), we looked for stress changes across space and over time and their possible association with earthquake clustering and fault interactions. We focused our attention on the Efpalio doublet of January 2010 (M = 5.5 and M = 5.4), with a high aftershock productivity, and attempted to reproduce and interpret stress changes prior to and after the initiation of this seismicity burst. The spatial distribution of stress changes was evaluated after smoothing the seismological data by means of a probability density function (PDF). The inverted stress calculations were compared with the calculations derived from an independent approach (elastic dislocation model) and this comparison was quantified. The results of the two methods are in good agreement (up to 80 %) in the far field, with the inversion technique providing more robust results in the near field, where they are more sensitive to the uncertainties of coseismic slip distribution. It is worth mentioning that the stress inversion model proved to be a very sensitive stress meter, able to detect even small stress changes correlated with spatio-temporal earthquake clustering. Data analysis was attempted from 1975 onwards to simulate the stress changes associated with stronger earthquakes over a longer time span. This approach revealed that only M > 5.5 events induce considerable stress variations, although in some cases there was no evidence for such stress changes even after an M > 5.5 earthquake.
机译：研究了希腊科林斯湾西部地震活跃且受到良好监测的应力场的时空变化。使用高度精确且范围广泛的区域目录，使用速率/状态相关的摩擦模型将地震活动率的变化转化为应力变化。在明确确定模型中包含的物理量（特征弛豫时间，断层本构参数和参考地震活动率）之后，我们寻找跨空间和时间的应力变化及其与地震聚类和断层相互作用的可能联系。我们将注意力集中在2010年1月的Efpalio doublet（M = 5.5和M = 5.4）上，具有较高的余震生产率，并试图在地震爆发之前和之后重现和解释应力变化。在通过概率密度函数（PDF）平滑地震数据之后，评估了应力变化的空间分布。将反向应力计算与从独立方法（弹性位错模型）得出的计算进行了比较，并对这种比较进行了量化。两种方法的结果在远场中吻合良好（高达80％），而反演技术在近场中提供了更可靠的结果，它们对同震滑动分布的不确定性更加敏感。值得一提的是，应力反演模型被证明是一种非常灵敏的应力计，甚至能够检测与时​​空地震聚类相关的很小的应力变化。从1975年开始尝试进行数据分析，以模拟与较长时间段内强地震相关的应力变化。这种方法表明，只有M> 5.5事件会引起相当大的应力变化，尽管在某些情况下，即使在M> 5.5地震后也没有证据表明这种应力会发生变化。

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