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首页> 外文期刊>Nature >INFLUENCE OF STATIC STRESS CHANGES ON EARTHQUAKE LOCATIONS IN SOUTHERN CALIFORNIA
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INFLUENCE OF STATIC STRESS CHANGES ON EARTHQUAKE LOCATIONS IN SOUTHERN CALIFORNIA

机译：静态应力变化对南加州地震发生的影响

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EARTHQUAKES induce changes in static stress on neighbouring faults that may delay, hasten or even trigger subsequent earthquakes(1-10). The length of time over which such effects persist has a bearing on the potential contribution of stress analyses to earthquake hazard assessment, but is presently unknown. Here we use an elastic half-space model(11) to estimate the static stress changes generated by damaging (magnitude M greater than or equal to 5) earthquakes in southern California over the past 26 years, and to investigate the influence of these changes on subsequent earthquake activity. We find that, in the 1.5-year period following a M greater than or equal to 5 earthquake, any subsequent nearby M greater than or equal to 5 earthquake almost always ruptures a fault that is loaded towards failure by the first earthquake. After this period, damaging earthquakes are equally likely to rupture loaded and relaxed faults. Our results suggest that there is a short period of time following a damaging earthquake in southern California in which simple Coulomb failure stress models could be used to identify regions of increased seismic hazard. [References: 25]
机译：地震在邻近断层上引起静应力变化，可能会延迟，加速甚至引发随后的地震（1-10）。这种影响持续的时间长短与应力分析对地震危险性评估的潜在贡献有关，但目前未知。在这里，我们使用弹性半空间模型（11）估算过去26年南加州破坏性地震（震级M大于或等于5）产生的静应力变化，并研究这些变化对地震的影响。随后的地震活动。我们发现，在M大于或等于5地震之后的1.5年内，附近的M大于或等于5地震附近的任何地震几乎总是使断层破裂，而该断层将在第一次地震中加载并破坏。在此期间之后，破坏性地震同样有可能使加载的断裂和松弛的断裂破裂。我们的结果表明，在加利福尼亚州南部发生的破坏性地震发生后的短时间内，可以使用简单的库仑破坏应力模型来识别地震危险性增加的区域。 [参考：25]

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