Fault Zone Guided Wave generation on the locked, late interseismic Alpine Fault, New Zealand

Fault Zone Guided Wave generation on the locked, late interseismic Alpine Fault, New Zealand
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新西兰锁定的晚期间震高山断层上的断层带导波生成

DOI:
10.1002/2015gl064208
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发表时间:
2015
影响因子:
5.2
通讯作者:
Eccles J
Eccles J
中科院分区:
地球科学1区
文献类型:
--
作者:
Eccles J

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断层带导波(FZGW)已被观察到的第一次在新西兰的压扭大陆板块边界,阿尔卑斯山断层,这是晚在其典型的地震周期。对这些阶段的持续研究为监测断层带的地震间条件提供了机会。安装在主滑动带20 m范围内的浅孔地震仪记录到了明显的频散地震尾波(~7-35 Hz)。在以低背景地震活动而闻名的中央阿尔卑斯断层附近,FZGW产生的微震事件位于断层的集水区尺度分区之外,表明近地表分段下方的低速区的横向连通性。低速区的初始建模表明波导宽度为60-200 m,S波速度降低10-40%,与其他成熟板块边界断层(如圣安德烈亚斯和北安纳托利亚断层)的断层核推断的结果相似。
Fault Zone Guided Waves (FZGWs) have been observed for the first time within New Zealand's transpressional continental plate boundary, the Alpine Fault, which is late in its typical seismic cycle. Ongoing study of these phases provides the opportunity to monitor interseismic conditions in the fault zone. Distinctive dispersive seismic codas (~7–35 Hz) have been recorded on shallow borehole seismometers installed within 20 m of the principal slip zone. Near the central Alpine Fault, known for low background seismicity, FZGW‐generating microseismic events are located beyond the catchment‐scale partitioning of the fault indicating lateral connectivity of the low‐velocity zone immediately below the near‐surface segmentation. Initial modeling of the low‐velocity zone indicates a waveguide width of 60–200 m with a 10–40% reduction inSwave velocity, similar to that inferred for the fault core of other mature plate boundary faults such as the San Andreas and North Anatolian Faults.
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