Triggering of eruptions at Axial Seamount, Juan de Fuca Ridge
Triggering of eruptions at Axial Seamount, Juan de Fuca Ridge
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胡安德富卡海岭轴海山喷发的触发
DOI：
10.1038/s41598-020-67043-0
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发表时间：
2020
影响因子：
4.6
通讯作者：
Chadwick, William W.
中科院分区：
文献类型：
--
作者：
Cabaniss, Haley E.;Gregg, Patricia M.;Nooner, Scott L.;Chadwick, William W.
海底火山Axial Seamount显示出可预测的膨胀喷发周期，这使得成功预测其2015年喷发。然而，其爆发的确切触发机制仍然模糊不清。膨胀可预测的喷发模式表明，岩浆库的压力阈值发生喷发，因此，超压喷发触发机制。然而，最近的火山动荡模型表明，当岩浆库周围的寄主岩石达到临界应力条件时，就会引发火山爆发。我们使用三维有限元模型来测试喷发触发的假设，该模型跟踪轴向岩浆储层周围的寄主岩石中的应力演化和机械故障。此外，我们提供了一个评估模型的灵敏度，各种温度和非温度依赖的流变学和外部构造应力。通过这种方式，我们评估了这些条件对火山变形、地壳应力演化和喷发预测的贡献。我们的结论是，模型流变学显着影响预测的时间，贯穿故障和喷发。无论假设的模型流变性如何，模型一致预测在12-14 MPa的储层压力阈值下喷发，从而支持轴向海山喷发是由储层超压引发的解释。
The submarine volcano Axial Seamount has exhibited an inflation predictable eruption cycle, which allowed for the successful forecast of its 2015 eruption. However, the exact triggering mechanism of its eruptions remains ambiguous. The inflation predictable eruption pattern suggests a magma reservoir pressure threshold at which eruptions occur, and as such, an overpressure eruption triggering mechanism. However, recent models of volcano unrest suggest that eruptions are triggered when conditions of critical stress are achieved in the host rock surrounding a magma reservoir. We test hypotheses of eruption triggering using 3-dimensional finite element models which track stress evolution and mechanical failure in the host rock surrounding the Axial magma reservoir. In addition, we provide an assessment of model sensitivity to various temperature and non-temperature-dependent rheologies and external tectonic stresses. In this way, we assess the contribution of these conditions to volcanic deformation, crustal stress evolution, and eruption forecasts. We conclude that model rheology significantly impacts the predicted timing of through-going failure and eruption. Models consistently predict eruption at a reservoir pressure threshold of 12–14 MPa regardless of assumed model rheology, lending support to the interpretation that eruptions at Axial Seamount are triggered by reservoir overpressurization.
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轴状海山的近期火山历史：对过去喷发动力学的地球物理洞察，着眼于加强对未来喷发的观测
影响因子：
2.8
作者：
Wilcock, William;Dziak, Robert;Tolstoy, Maya;Chadwick, William;Nooner, Scott;Bohnenstiel, DelWayne;Caplan-Auerbach, Jacqueline;Waldhauser, Felix;Arnulf, Adrien;Ballard, Christian
通讯作者：
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影响因子：
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作者：
D. Roman;K. Cashman
通讯作者：
K. Cashman
影响因子：
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作者：
Albright, J. A.;Gregg, P. M.;Freymueller, J. T.
通讯作者：
Freymueller, J. T.
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DOI：
--
发表时间：
1999
期刊：
影响因子：
--
作者：
R. Dziak;C. Fox
通讯作者：
C. Fox
影响因子：
56.9
作者：
W. Wilcock;M. Tolstoy;F. Waldhauser;Charles Garcia;Yen Joe Tan;D. Bohnenstiehl;J. Caplan‐Auerbach;R. Dziak;A. Arnulf;M. E. Mann
通讯作者：
W. Wilcock;M. Tolstoy;F. Waldhauser;Charles Garcia;Yen Joe Tan;D. Bohnenstiehl;J. Caplan‐Auerbach;R. Dziak;A. Arnulf;M. E. Mann