肥皂泡破裂的动力学及其对火山声学的影响
Dynamics of soap bubble bursting and its implications to volcano acoustics
摘要：
为了评估当巨大的气泡在岩浆管道顶部破裂时所涉及的物理机制，进行了实验室实验。超压气体腔最初由薄液膜封闭，然后突然破裂。研究了爆炸产生的声信号。关键的结果是，声信号的幅度和能量强烈依赖于膜破裂时间。由于在实验和现场中破裂时间是不受控制的，因此单独测量大气中的声学超压不能提供关于爆炸前气泡内的超压的任何信息。这可以解释经常在火山上观察到的次声、地震和爆炸动力学之间的低能量分离。
英文摘要：
In order to assess the physical mechanisms at stake when giant gas bubbles burst at the top of a magma conduit, laboratory experiments have been performed. An overpressurized gas cavity is initially closed by a thin liquid film, which suddenly bursts. The acoustic signal produced by the bursting is investigated. The key result is that the amplitude and energy of the acoustic signal strongly depend on the film rupture time. As the rupture time is uncontrolled in the experiments and in the field, the measurement of the acoustic excess pressure in the atmosphere, alone, cannot provide any information on the overpressure inside the bubble before explosion. This could explain the low energy partitioning between infrasound, seismic and explosive dynamics often observed on volcanoes.
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