Seismicity at the Northern Hikurangi Margin, New Zealand, and Investigation of the Potential Spatial and Temporal Relationships With a Shallow Slow Slip Event
Seismicity at the Northern Hikurangi Margin, New Zealand, and Investigation of the Potential Spatial and Temporal Relationships With a Shallow Slow Slip Event
复制标题
新西兰希库朗吉北部边缘的地震活动以及与浅层慢滑事件的潜在时空关系的调查
DOI：
10.1029/2018jb017211
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
E. Todd
中科院分区：
文献类型：
--
作者：
J. Yarce;A. Sheehan;J. Nakai;Susan Y. Schwartz;K. Mochizuki;M. Savage;L. Wallace;S. Henrys;S. Webb;Yoshihiro Ito;R. Abercrombie;B. Fry;H. R. Shaddox;E. Todd
在2014-2015年，Hikurangi海底震颤和慢滑调查实验在大型慢滑事件的正上方部署了海底绝对压力计和海底地震仪，从而可以详细检查慢滑与地震之间的关系。Hikurangi海底调查的震颤和慢滑数据与附近现有的陆地台站相结合，创建了一个由2,300次震级在0.5到4.7级之间的地震组成的微震活动目录，这些地震的震级在1.5级之间，产生的事件几乎是陆上网络单独检测到的事件的两倍。这大大改善了这个活跃俯冲带边缘的地震活动目录，特别是在仅使用内陆永久地震网络难以研究的近海部分。海上网络足迹内事件的新位置表明，海沟附近的地震系统性地比仅使用陆基台站的位置浅，并且位于其位置的西北（向陆地）。我们的研究结果表明，Hikurangi地震活动集中在两个NE-SW波段，一个在外弧前楔下方的近海，一个在东劳德代尔半岛下方的陆上，大多数地震发生在俯冲的太平洋板块内，在板块界面处的比例较小。我们发现两个带之间和内部弧前楔下方的微震活动存在一个20公里宽的东北向缺口，这个地震活动缺口与缓慢滑动斑块的下倾边缘接壤。
In 2014–2015, the Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip experiment deployed seafloor absolute pressure gauges and ocean bottom seismometers directly above a large slow slip event, allowing examination of the relationship between slow slip and earthquakes in detail. Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip data were combined with nearby existing land stations to create a catalog of microseismicity consisting of 2,300 earthquakes ranging in magnitude between 0.5 and 4.7 that is complete to magnitude 1.5, yielding almost twice as many events as detected by the onshore networks alone. This greatly improves the seismicity catalog for this active subduction zone margin, especially in the offshore portion that was difficult to study using only the inland permanent seismic network. The new locations for the events within the footprint of the offshore network show that earthquakes near the trench are systematically shallower than and NW (landward) of their locations using only land‐based stations. Our results indicate that Hikurangi seismicity is concentrated in two NE‐SW bands, one offshore beneath the outer forearc wedge, one onshore beneath the eastern Raukumara Peninsula, and the majority of earthquakes are within the subducting Pacific plate with a smaller percent at the plate interface. We find a 20‐km wide northeast trending gap in microseismicity between the two bands and beneath the inner forearc wedge and this gap in seismicity borders the downdip edge of a slow slip patch.
影响因子：
5
作者：
Hoernle, Kaj;Hauff, Folkmar;Davy, Bryan
通讯作者：
Davy, Bryan
影响因子：
18.3
作者：
Wallace, Laura M.;Kaneko, Yoshihiro;Fry, Bill
通讯作者：
Fry, Bill