A limit on the effect of rectified diffusion in volcanic systems
A limit on the effect of rectified diffusion in volcanic systems
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DOI：
10.1029/2005gl024753
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发表时间：
2006-01-28
影响因子：
5.2
通讯作者：
Brodsky, EE
中科院分区：
文献类型：
--
作者：
Ichihara, M;Brodsky, EE
[1]强迫振荡可以通过一种称为整流扩散的过程将溶解的挥发物推入气泡。在工程应用中，精馏扩散的泵送作用使气泡长大。在地学中，远距离地震产生的地震波触发火山喷发的机制被认为是纠偏扩散。以前的地学研究采用了工程结果，并提出在岩浆室这样的封闭系统中，纠偏扩散导致压力增加，而不是气泡增长。然而，火山应用与工程应用的根本不同之处在于，溶解度随着承压系统中压力的增加而不断变化。在这里，我们提出了第一个自洽处理的整流扩散在受限系统。溶解度的演变有很大的影响。新的解决方案表明，以前的工作大大高估了岩浆系统中纠偏扩散的影响。对于合理的地震波幅，压力变化最多只有初始值的2×10~(-9)。
[1] Forced oscillations can push dissolved volatiles into bubbles by a process called rectified diffusion. In engineering applications, the pumping action of rectified diffusion makes bubbles grow. In the geosciences, rectified diffusion is a suggested mechanism to trigger volcanic eruptions with seismic waves generated by distant earthquakes. Previous geoscience studies adopted the engineering results and proposed that in a confined system like a magma chamber, rectified diffusion causes pressure increase rather than bubble growth. However, the volcanic application is fundamentally different than engineering applications in that solubility continually changes with increasing pressure in the confined system. Here we present the first self-consistent treatment of rectified diffusion in a confined system. Evolving solubility has a significant effect. The new solution demonstrates that previous work significantly overestimated the effect of rectified diffusion in magmatic systems. For reasonable seismic wave amplitudes, the pressure change is at the most 2 x 10(-9) of its initial value.