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
复制标题
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
中科院分区:
文献类型:
--
作者:
Li K
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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DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
T. Powell;J. Neuberg
通讯作者:
J. Neuberg
影响因子:
5.2
作者:
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A. Peltier
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