What is the Smallest Earthquake Magnitude that Needs to be Considered in Assessing Liquefaction Hazard?
What is the Smallest Earthquake Magnitude that Needs to be Considered in Assessing Liquefaction Hazard?
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DOI：
10.1193/032218eqs064m
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发表时间：
2019-08
影响因子：
5
通讯作者：
R. Green;J. Bommer
中科院分区：
文献类型：
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作者：
R. Green;J. Bommer
对地震对基础设施的潜在影响进行概率评估需要考虑比确定性危害和风险评估中通常考虑的震级小的事件。在这种情况下，确定是否存在一个震级阈值是有用的，在该阈值以下，触发液化的可能性可以被忽略，因为概率液化危险分析需要这样的下限。基于现场观测和简单的参数研究，我们得出结论，小到矩震级4.5的地震可以触发液化，在极其敏感的土壤沉积。然而，对于适合建筑结构的土壤剖面，触发液化的最小地震震级约为5级。因此，我们建议，在液化危险评估的建筑地盘，5.0级作为最小地震规模的考虑，而震级低至4.5可能是适当的一些其他类型的基础设施。
Probabilistic assessments of the potential impact of earthquakes on infrastructure entails the consideration of smaller magnitude events than those generally considered in deterministic hazard and risk assessments. In this context, it is useful to establish if there is a magnitude threshold below which the possibility of triggering liquefaction can be discounted because such a lower bound is required for probabilistic liquefaction hazard analyses. Based on field observations and a simple parametric study, we conclude that earthquakes as small as moment magnitude 4.5 can trigger liquefaction in extremely susceptible soil deposits. However, for soil profiles that are suitable for building structures, the minimum earthquake magnitude for the triggering of liquefaction is about 5. We therefore propose that in liquefaction hazard assessments of building sites, magnitude 5.0 be adopted as the minimum earthquake size considered, while magnitudes as low as 4.5 may be appropriate for some other types of infrastructure.