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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Focused seismicity triggered by flank instability on Kilauea's Southwest Rift Zone
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Focused seismicity triggered by flank instability on Kilauea's Southwest Rift Zone

机译：基拉韦厄西南裂隙带的侧面不稳定引发的集中地震活动

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摘要

Swarms of earthquakes at the head of the Southwest Rift Zone on Kilauea Volcano, Hawaii, reveal an interaction of normal and strike-slip faulting associated with movement of Kilauea's south flank. A relocated subset of earthquakes between January 2012 and August 2014 are highly focused in space and time at depths that are coincident with the south caldera magma reservoir beneath the southern margin of Kilauea Caldera. Newly calculated focal mechanisms are dominantly dextral shear with a north-south preferred fault orientation. Two earthquakes within this focused area of seismicity have normal faulting mechanisms, indicating two mechanisms of failure in very close proximity (10's of meters to 100 m). We suggest a model where opening along the Southwest Rift Zone caused by seaward motion of the south flank permits injection of magma and subsequent freezing of a plug, which then fails in a right-lateral strike-slip sense, consistent with the direction of movement of the south flank. The seismicity is concentrated in an area where a constriction occurs between a normal fault and the deeper magma transport system into the Southwest Rift Zone. Although in many ways the Southwest Rift Zone appears analogous to the more active East Rift Zone, the localization of the largest seismicity (M2.5) within the swarms to a small volume necessitates a different model than has been proposed to explain the lineament outlined by earthquakes along the East Rift Zone. Published by Elsevier B.V.
机译：夏威夷基拉韦厄火山西南裂谷区头部的地震群，显示出与基拉韦厄南翼运动相关的正断层和走滑断层的相互作用。 2012年1月至2014年8月间发生地震的一部分子集高度集中在时空上，其深度与基拉韦厄火山口南缘下方的南火山口岩浆储层一致。新计算的震源机制主要是右旋剪切，具有南北偏向的断层取向。在这个地震活动重点区域内的两次地震具有正常的断层机制，表明在非常接近的范围内（十米至100 m）有两种破坏机制。我们建议建立一个模型，在该模型中，由于南翼的向海运动引起的沿西南裂谷带的开放，允许注入岩浆并随后冻结塞子，然后塞子在右侧走滑方向上失效，与滑石的运动方向一致。南侧。地震活动集中在正常断层和进入西南裂谷带的较深岩浆输送系统之间发生收缩的区域。尽管从很多方面看，西南裂谷带都类似​​于较活跃的东裂谷带，但群内最大地震活动度（> M2.5）的局部化需要较小的模型，这与为解释所概述的构造而提出的模型不同。沿东纵裂带地震。由Elsevier B.V.发布

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