Inflations prior to Vulcanian eruptions and gas bursts detected by tilt observations at Semeru Volcano, Indonesia
Inflations prior to Vulcanian eruptions and gas bursts detected by tilt observations at Semeru Volcano, Indonesia
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印度尼西亚塞梅鲁火山倾斜观测发现火山喷发前的通货膨胀和气体爆发
DOI：
10.1007/s00445-012-0579-z
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发表时间：
2012
影响因子：
3.5
通讯作者：
Ryohei Kawaguchi、Surono、Muhamad Hendrasto、Umar Rosadi
中科院分区：
文献类型：
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作者：
Takeshi Nishimura、Masato Iguchi;Ryohei Kawaguchi、Surono、Muhamad Hendrasto、Umar Rosadi
我们研究了印度尼西亚塞梅鲁火山的通货膨胀的基本特征，以阐明在两种不同类型的爆炸性喷发之前的增压过程：火山喷发和气体爆发。对安装在活动陨石坑附近的倾斜仪获得的数据进行分析，可以澄清两种类型喷发的共同特征和差异。为了提高信噪比和确定膨胀的平均特征，我们叠加了不同震级的喷发获得的倾斜信号，并估计了与这些喷发相关的地震信号的最大幅度。火山喷发会爆炸性地释放出大量的火山灰，在喷发之前，火山喷发之前会加速通货膨胀，S说，这表明气相的体积膨胀。相比之下，气体爆发伴随着爆炸声迅速涌出水蒸气，遵循从S开始的非加速通胀变化，每次排放前20分钟。两种喷发方式的倾斜幅度都随着喷发强度的增加而增加。这表明，火山喷发前储存在管道中的岩浆或气体的体积和/或压力控制着火山喷发的规模。这些结果进一步表明，可以通过对火山膨胀的大地测量来预测喷发的强度。
We examine the basic characteristics of inflations at Semeru Volcano, Indonesia, to clarify the pressurization process prior to two different styles of explosive eruptions: Vulcanian eruptions and gas bursts. Analysis of data obtained from tilt meters installed close to the active crater allows clarification of the common features and the differences between the two styles of eruptions. To improve the signal-to-noise ratio and to determine the mean characteristics of the inflations, we stack tilt signals obtained from eruptions of different magnitudes and evaluate the maximum amplitude of the seismic signal associated with these eruptions. Vulcanian eruptions, which explosively release large amounts of ash, are preceded by accelerating inflation about 200–300 s before the eruption, which suggests volume expansion of the gas phase. In contrast, gas bursts, which rapidly effuse water steam accompanied by explosive sounds, follow non-accelerating changes of inflation starting 20 s before each emission. Tilt amplitudes increase with the magnitude of eruptions for both eruption styles. This suggests that the volume and/or pressure of magma or gas stored in the conduit before eruptions controls the magnitude of volcanic eruptions. These results further suggest that the magnitude of eruptions can be predicted from geodetic measurements of volcano inflation.