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首页> 外文期刊>Seismological research letters >Completeness of the Paleoseismic Active-Fault Record in New Zealand
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Completeness of the Paleoseismic Active-Fault Record in New Zealand

机译：新西兰古地震活动断层记录的完整性

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摘要

Recent damaging earthquakes in New Zealand ruptured faults that were not known to be active. We analyzed New Zealand historical moderate-to-great magnitude earthquakes since 1845 (M-w 6-8.2) to estimate the level of completeness of earthquake fault sources in the National Seismic Hazard Model (NSHM) and the paleoseismic record. Our analysis assumes that the historical earthquakes are representative of the paleoseismic record and, due to the small number of events (45 M-w >= 6), is qualitative. We find that about half of all historical earthquakes M-w >= 7.0 ruptured faults that, based on today's state of knowledge of active-fault locations, would not have been identified as active prior to the event. The majority of historical events on faults previously not identified as active were M-w < 7.3 and either did not displace the ground surface or were located in areas where the rates of erosion or burial exceed fault-slip rates. Incompleteness of active-fault sources in the present NSHM is the greatest for earthquake fault sources with long recurrence intervals of >= 10; 000 yr. These inferred unidentified active faults will, in many cases, be located in low strain-rate areas, where they may make an important contribution to the seismic-hazard budget.
机译：新西兰最近的破坏性地震使未知的断裂破裂。我们分析了1845年以来的新西兰历史中到大地震（M-w 6-8.2），以估算国家地震危险模型（NSHM）和古地震记录中地震断层源的完整性水平。我们的分析假设历史地震是古地震记录的代表，并且由于事件数量少（45 M-w> = 6），因此是定性的。我们发现，根据今天对活动断层位置的了解情况，在所有历史地震中，M-w> = 7.0会破坏断层，在事件发生之前不会将其断定为活动断层。以前未被确定为活动断层的大多数历史事件的M-w <7.3，且未移位地面或位于侵蚀或埋藏速率超过断层滑移率的区域。当前的NSHM中，活动断层源的不完整性对于> = 10的长重复间隔的地震断层源是最大的。 000年在许多情况下，这些推断出的未识别活动断层将位于应变率较低的地区，在这些地区可能对地震灾害预算做出重要贡献。

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