Magma degassing triggered by static decompression at Kīlauea Volcano, Hawai‘i
Magma degassing triggered by static decompression at Kīlauea Volcano, Hawai‘i
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夏威夷基拉韦厄火山静态减压引发的岩浆脱气
DOI：
10.1029/2009gl039214
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发表时间：
2009
影响因子：
5.2
通讯作者：
T. Gerlach
中科院分区：
文献类型：
--
作者：
M. Poland;A. J. Sutton;T. Gerlach
在2007年6月中旬，夏威夷的卡波劳亚火山的山顶，由于岩浆从地下流出，供给了东部裂谷带的侵入和喷发，因此迅速缩小。与通货紧缩同时发生的是，二氧化硫排放率在几周内下降到背景水平之前上升了四倍。我们建议，SO2释放是由静态减压引起的岩浆撤出Kempllauea的浅峰会水库。放气模型表明，压力下降0.5 - 3 MPa，这是足以触发所观察到的过量SO2从一个相对较小的体积的岩浆在建模的源深度下Kendlauea的首脑会议。静态减压也可以解释伴随着气体排放增加的其他通缩事件，包括2008年Kemlauea高峰喷发的阶段。与意外的火山气体排放有关的危险主张增加对岩浆储层压力波动的认识。
During mid‐June 2007, the summit of Kīlauea Volcano, Hawai‘i, deflated rapidly as magma drained from the subsurface to feed an east rift zone intrusion and eruption. Coincident with the deflation, summit SO2 emission rates rose by a factor of four before decaying to background levels over several weeks. We propose that SO2 release was triggered by static decompression caused by magma withdrawal from Kīlauea's shallow summit reservoir. Models of the deflation suggest a pressure drop of 0.5–3 MPa, which is sufficient to trigger exsolution of the observed excess SO2 from a relatively small volume of magma at the modeled source depth beneath Kīlauea's summit. Static decompression may also explain other episodes of deflation accompanied by heightened gas emission, including the precursory phases of Kīlauea's 2008 summit eruption. Hazards associated with unexpected volcanic gas emission argue for increased awareness of magma reservoir pressure fluctuations.