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Distribution of tsunami interevent times

机译:海啸间隔时间的分布

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The distribution of tsunami interevent times is analyzed using global and site-specific (Hilo, Hawaii) tsunami catalogs. An empirical probability density distribution is determined by binning the observed interevent times during a period in which the observation rate is approximately constant. The empirical distributions for both catalogs exhibit non-Poissonian behavior in which there is an abundance of short interevent times compared to an exponential distribution. Two types of statistical distributions are used to model this clustering behavior: (1) long-term clustering described by a universal scaling law, and (2) Omori law decay of aftershocks and triggered sources. The empirical and theoretical distributions all imply an increased hazard rate after a tsunami, followed by a gradual decrease with time approaching a constant hazard rate. Examination of tsunami sources suggests that many of the short interevent times are caused by triggered earthquakes, though the triggered events are not necessarily on the same fault.
机译:使用全球和特定地点(夏威夷希洛)的海啸目录分析海啸事件间隔时间的分布。经验概率密度分布是通过将观察速率近似恒定的时间段内的观察事件间隔时间进行合并来确定的。两种目录的经验分布都表现出非泊松行为,其中与指数分布相比,事件间隔时间短。两种类型的统计分布用于对这种聚类行为进行建模:(1)通用尺度定律描述的长期聚类;(2)余震和触发源的大森定律衰减。经验和理论分布都暗示海啸后的危险率增加,然后随着时间的推移逐渐降低,接近恒定的危险率。对海啸源的检查表明,许多短的事件间隔时间是由触发地震引起的,尽管触发事件不一定是同一断层。

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