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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Dynamic triggering of earthquakes in the North Island of New Zealand following the 2016 M-w 7.8 Kaikoura earthquake
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Dynamic triggering of earthquakes in the North Island of New Zealand following the 2016 M-w 7.8 Kaikoura earthquake

机译：2016 M-W 7.8 Kaikoura地震后新西兰北岛地震动态触发

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摘要

Large earthquakes are capable of triggering microseismicity, deep tremor and slow-slip events from intermediate- to long-distance ranges. Unfortunately, earthquake catalogs are typically incomplete right after large mainshocks. Hence, mapping triggering patterns and understanding the underlying triggering mechanism are challenging. Here we present two different types of seismicity responses to dynamic stressing by passing seismic waves in the North Island of New Zealand following the 2016 M-w 7.8 KaikOura earthquake. Based on a template matching technique, we identify up to 4-7 times more earthquakes than listed in New Zealand's GeoNet catalog. We also compute the dynamic stress perturbations in the North Island due to the Kaikoura mainshock and compare them to seismicity rate changes to identify regions with high susceptibility to dynamic stress triggering. Abundant triggered earthquakes occurred immediately following the mainshock in the shallow crust around the active Taupo Volcano Zone, likely related to activation of crustal faults/fluids associated with back-arc rifting and volcanism. Approximately 8 days after the initial dynamic stressing, an active burst of seismicity with the largest event of M-L 5.55 occurred along the shallow megathrust near Porangahau on the east coast of the North Island. This burst of seismicity is likely driven by a similar to M-w 7.1 shallow slow slip event dynamically triggered by the mainshock. Our findings reveal the heterogeneous nature of dynamic triggering in a plate boundary region with recent large earthquake sequences and aseismic transient events and further highlight the difficulties in time-dependent earthquake forecasting following large mainshocks. (C) 2020 Elsevier B.V. All rights reserved.
机译：大地震能够触发中远距离范围的微震、深震和慢滑事件。不幸的是，大地震过后，地震目录通常是不完整的。因此，绘制触发模式和理解潜在触发机制是一项挑战。在这里，我们展示了2016年M-w 7.8 KaikOura地震后新西兰北岛两种不同类型的地震活动对通过地震波传递的动态应力的响应。基于模板匹配技术，我们识别出的地震比新西兰GeoNet目录中列出的地震多4-7倍。我们还计算了北岛因Kaikoura主震引起的动应力扰动，并将其与地震活动率变化进行比较，以确定对动应力触发高度敏感的区域。活跃的陶波火山带周围的浅地壳主震发生后，立即发生了大量触发地震，可能与弧后裂谷作用和火山作用相关的地壳断层/流体的激活有关。在初始动态应力后大约8天，北岛东海岸波兰加豪附近的浅层巨冲断层发生了一次活跃的地震活动爆发，最大事件为M-L 5.55。这次地震活动爆发可能是由主震动态触发的类似M-w 7.1浅层慢滑事件驱动的。我们的研究结果揭示了板块边界地区近期大地震序列和抗震瞬变事件动态触发的异质性，并进一步突出了大主震后时间相关地震预测的困难。（C） 2020爱思唯尔B.V.版权所有。

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