Gas flux cyclic regime at an open vent magmatic column inferred from seismic and acoustic records
Gas flux cyclic regime at an open vent magmatic column inferred from seismic and acoustic records
复制标题
根据地震和声学记录推断的开放式火山岩浆柱的气体通量循环状况
作者：
Gen Kondo;H. Aoyama;T. Nishimura;M. Ripepe;G. Lacanna;R. Genco;R. Kawaguchi;Taishi Yamada;T. Miwa;E. Fujita
2014年8月7日，斯特龙博利的北方侧翼出现了一个新的喷发口。一个特征模式，观察到地震和次声信号振幅之前，这一喷涌喷发。该模式由以下重复循环组成：（1）安静阶段，（2）膨化阶段，和（3）爆发阶段。地震信号和次声信号之间的相关性表明，在喷气阶段的脉冲是由在中央火山口的小气囊的反复爆发，而爆炸阶段正好与中央火山口的爆炸。我们发现，脱气的岩浆柱发生在周期增加的气体流量，控制从泡状流（膨化阶段）的过渡，段塞流（爆炸阶段）的气体政权。平静阶段的特点是一个恒定的时间长度为150秒，表明气体上升的岩浆柱作为组织良好的气体层波。这些周期代表的气体流量制度的周期性变化，在浅岩浆柱，与岩浆气体供应输入速率的增加，喷溢喷发前。
On August 7, 2014, a new effusive vent opened on the northern flank of Stromboli. A characteristic pattern was observed in both seismic and infrasonic signal amplitudes prior to this effusive eruption. The pattern consisted of the repeating cycle: (1) quiet phase, (2) puffing phase, and (3) explosion phase. Correlation between seismic and infrasound signal suggests that pulses in the puffing phase were caused by repetitive bursts of small gas pockets at the central crater, while the explosion phase coincided with an explosion at the central crater. We show that degassing of the magma column occurred in cycles of increasing gas flux, which controlled the transition from a bubbly flow (puffing phase), to a slug flow (explosion phase) gas regime. The quiet phase was characterized by a constant time length of 150 s, indicating that the gas rose in the magma column as well-organized waves of gas layers. These cycles represent cyclic changes of the gas flux regime in the shallow magma column, associated with increases in the magma-gas supply input rate before the effusive eruption.
DOI：
10.3390/rs71215876
发表时间：
2015-12
期刊：
Remote. Sens.
影响因子：
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作者：
K. Zakšek;M. Hort;E. Lorenz
通讯作者：
K. Zakšek;M. Hort;E. Lorenz