Seismic tremor reveals slow fracture propagation prior to the 2018 eruption at Sierra Negra volcano, Galápagos

Seismic tremor reveals slow fracture propagation prior to the 2018 eruption at Sierra Negra volcano, Galápagos
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地震揭示了加拉帕戈斯群岛内格拉火山 2018 年喷发前的缓慢裂缝传播

DOI:
10.1016/j.epsl.2022.117533
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发表时间:
2022
影响因子:
5.3
通讯作者:
Li K
Li K
中科院分区:
地球科学1区
文献类型:
--
作者:
Li K

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在活火山附近观测到的地震是火山监测的重要工具,因为它经常出现在火山喷发前不久。尽管震动可以由多种物理过程产生,但它通常被解释为地下岩浆流动的直接证据。这些解释通常会纳入潜在火山喷发的风险评估中。利用捕获了 2018 年加拉帕戈斯群岛内格拉山脉喷发的分布式地震网络的震颤幅度和频谱数据的时间演化,我们确定震颤与地下流体运动没有直接关系。相反,在内格拉山脉的震颤可能表明存在缓慢传播的断裂,后来被用作无声岩浆流的通道。源迁移以及喷发前和同时喷发震颤的光谱特征的明显差异使得可以对未来喷发地点进行位置估计并确定喷发开始的精确时间。
Seismic tremor observed near active volcanoes is an important tool for volcano monitoring as it often appears shortly before eruptions. Although tremor can be generated by a variety of physical processes it is usually interpreted as direct evidence for flowing magma in the sub-surface. These interpretations typically feed into risk assessments for potential eruptions. Using the temporal evolution of tremor amplitude and spectral data from a distributed seismic network that captured the 2018 eruption at Sierra Negra in Galápagos, we determine that tremor is not directly related to sub-surface fluid movement. Instead at Sierra Negra tremor likely indicates a slowly propagating fracture, which is later exploited as a pathway for silent magma flow. Distinct differences in the source migration and the spectral character of pre-eruptive and co-eruptive tremor allow both a location estimate of the future eruption site and a precise timing of the eruption onset.
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