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首页> 外文期刊>Earth, planets and space: EPS >Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption
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Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption

机译：在Shinmoe-dake 2011喷发期间，在喷发活动过渡期间从地震声震颤转变为地震声震颤

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摘要

This paper reports a sequence of harmonic tremor observed during the 2011 eruption of Shinmoe-dake volcano, Kyushu, Japan. The main eruptive activity started with subplinian eruptions, followed by lava effusion. Harmonic tremor was observed as seismic waves during the final stage of the effusive eruption. The tremor observed at this stage had unclear and fluctuating harmonic modes. In the atmosphere, however, many impulsive acoustic waves indicating small surface explosions were observed. When effusion stopped and explosive degassing began, harmonic tremor was observed as acoustic waves in the air and in the seismic data, and the harmonic modes became clearer and more stable. This transition in the character of the harmonic tremor coincided with rapid deflation of the lava that had accumulated in the crater. Based on these observations, and laboratory experiments reproducing the features of the wave fields, it is concluded that the harmonic tremor sequence at Shinmoe-dake was generated by gas flowing through channels in the gradually solidifying lava. Comparing our results with the few cases of similar transition observed at other volcanoes, we expect that the transition indicates changes in magma rheology and degassing conditions in the crater, and therefore of changes in eruptive activity.
机译：本文报道了2011年日本九州Shinemoe-dake火山喷发期间观测到的一系列谐波震颤。主要的喷发活动开始于亚平底爆发，然后是熔岩喷出。在喷发末期观察到谐波震颤为地震波。在此阶段观察到的震颤具有不清楚且波动的谐波模式。然而，在大气中，观察到许多表示较小表面爆炸的脉冲声波。当渗出停止并且爆炸性脱气开始时，在空气和地震数据中观察到谐波震颤是声波，谐波模式变得更清晰，更稳定。谐波震颤特征的这种转变与火山口中堆积的熔岩的快速放气相吻合。根据这些观察结果，以及通过重现波场特征的实验室实验，可以得出结论，新莫河（Shinmoe-ake）的谐波震颤序列是由流经逐渐凝固的熔岩通道的气体产生的。将我们的结果与在其他火山中观察到的类似过渡的少数情况进行比较，我们预计该过渡表明火山口的岩浆流变学和脱气条件发生了变化，因此火山爆发活动也发生了变化。

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