Slab-derived fluid storage in the crust elucidated by earthquake swarm

Slab-derived fluid storage in the crust elucidated by earthquake swarm
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地震群阐明了地壳中板片衍生的流体储存

DOI:
10.1038/s43247-022-00610-7
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发表时间:
2022
影响因子:
7.9
通讯作者:
Keisuke Yoshida
Keisuke Yoshida
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Yusuke Mukuhira;Masaoki Uno;Keisuke Yoshida

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板片衍生的流体控制着俯冲带的地壳动力学。然而,板片衍生的流体预算从未被量化超出地球物理和地质时空分辨率。在这里,我们的目标是与 M9 东北地震相关的强烈地震群,它代表了板片衍生流体的临界动态行为。通过利用注入诱发的地震活动见解,所涉及的流体体积已被量化,合理范围为 106−108 立方米。与地质代理的比较表明,估计的流体量可以在 102-104 年内通过下地壳的供应来积累。我们的研究表明,在中地壳水平储存了如此大量的水性流体,在东北地震中引发了连续约 2 年的群活动,这表明地震群与 M9 级地震(103 年周期)和矿脉和矿床之间可能存在联系。这项研究揭示了对动态板片导出的流体收支的定量理解。
Slab-derived fluids control crustal dynamics in the subduction zone. However, the slab-derived fluid budget has never been quantified beyond a geophysical and geological spatiotemporal resolution. Here, we target an intense earthquake swarm associated with the M9 Tohoku earthquake, which represented the critical dynamic behavior of slab-derived fluid. The fluid volume involved has been quantified, with a plausible range of 106−108m3, by utilizing injection-induced seismicity insights. Comparisons with geological proxies suggest that the estimated fluid volume can be accumulated via supply from the lower crust within 102–104y. Our study demonstrated such amount of aqueous fluid stored at the midcrustal level, which triggered consecutive swarm activity for ~2 y with the Tohoku earthquake, suggesting a possible link between earthquake swarms to M9 class earthquakes (103y cycle) and mineral veins and deposits. This study has shed light on the quantitative understanding of the dynamic slab-derived fluid budget.
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