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Strong Earthquakes Recurrence Times of the Southern Thessaly, Greece, Fault System: Insights from a Physics-Based Simulator Application
Frontiers in Earth Science ( IF 2.9 ) Pub Date : 2021-01-07 , DOI: 10.3389/feart.2021.596854
Christos Kourouklas , Rodolfo Console , Eleftheria Papadimitriou , Maura Murru , Vassilios Karakostas

The recurrence time, Tr, of strong earthquakes above a predefined magnitude threshold on specific faults or fault segments is an important parameter, that could be used as an input in the development of long-term fault-based Earthquake Rupture Forecasts (ERF). The amount of observational recurrence time data per segment is often limited, due to the long duration of the stress rebuilt and the shortage of earthquake catalogs. As a consequence, the application of robust statistical models is difficult to implement with a precise conclusion, concerning Tr and its variability. Physics-based earthquake simulators are a powerful tool to overcome these limitations, and could provide much longer earthquake records than the historical and instrumental earthquake catalogs. A physics-based simulator, which embodies known physical processes, is applied in the Southern Thessaly Fault Zone (Greece), aiming to provide insights about the recurrence behavior of earthquakes with Mw ≥ 6.0 in the six major fault segments in the study area. The build of the input fault model is made by compiling the geometrical and kinematic parameters of the fault network from the available seismotectonic studies. The simulation is implemented through the application of the algorithm multiple times, with a series of different input free parameters, in order to conclude in the simulated catalog which showed the best performance in respect to the observational data. The detailed examination of the 254 Mw ≥ 6.0 earthquakes reported in the simulated catalog reveals that both single and multiple segmented ruptures can be realized in the study area. Results of statistical analysis of the interevent times of the Mw ≥ 6.0 earthquakes per segment evidence quasi-periodic recurrence behavior and better performance of the Brownian Passage Time (BPT) renewal model in comparison to the Poissonian behavior.



中文翻译:

希腊南部色萨利,断层系统的强烈地震复发时间:来自基于物理的模拟器应用的见解

重复时间, Ť[R对于特定断层或断层段而言,超过预定义震级阈值的强地震中的,是一个重要参数,可以用作开发基于长期断层的地震破裂预测(ERF)的输入。由于应力重建的持续时间长且地震目录不足,因此每个分段的观测复发时间数据量通常受到限制。结果,很难得出可靠的统计模型,而得出一个准确的结论,涉及Ť[R及其可变性。基于物理的地震模拟器是克服这些局限性的有力工具,并且可以提供比历史地震和仪器地震目录更长的地震记录。在南部的色萨利断裂带(希腊)中使用了一种基于物理的模拟器,该模拟器体现了已知的物理过程,旨在提供有关地震复发行为的见解。中号w研究区域的六个主要断层段中≥6.0。输入故障模型的构建是通过根据可用的地震构造研究汇编故障网络的几何和运动学参数来完成的。通过使用一系列不同输入自由参数的算法多次应用该模拟,以便在模拟目录中得出结论,该目录在观测数据方面表现出最佳性能。254的详细检查中号w模拟目录中报告的≥6.0级地震表明,研究区域可以实现单段和多段破裂。比赛间隔时间的统计分析结果中号w 每段≥6.0级地震证明了准周期复发行为,并且与Poissonian行为相比,布朗通行时间(BPT)更新模型具有更好的性能。

更新日期:2021-02-25
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