The acoustic signatures of ground acceleration, gas expansion, and spall fallback in experimental volcanic explosions
The acoustic signatures of ground acceleration, gas expansion, and spall fallback in experimental volcanic explosions
复制标题
实验火山爆炸中地面加速度、气体膨胀和剥落回落的声学特征
DOI：
10.1002/2014gl059324
复制
发表时间：
2014
影响因子：
5.2
通讯作者：
G. Valentine
中科院分区：
文献类型：
--
作者：
D. Bowman;J. Taddeucci;Keehoon Kim;Jacob F. Anderson;J. Lees;A. Graettinger;I. Sonder;G. Valentine
在一系列场尺度埋藏爆炸期间的次声和高速成像为火山爆发声波的产生和辐射模式提供了新的细节。我们记录了一系列不同埋深和装药大小的地下爆炸的次声和高速视频。联合观测和建模可以提取与初始地面变形的大小、气体爆发的贡献以及位移物质回退的时间相关的声能。这三个阶段的存在和相对声振幅取决于爆炸的大小和深度。这些结果激发了一个概念模型，该模型将地面加速度、瓦斯破裂和碎屑回落对埋地爆炸的声波振幅和波形特征的连续贡献联系起来。在此模型的背景下，我们将危地马拉的Santiaguito火山、日本的樱岛火山和Suwonosejima火山的次声信号文献放在一起。
Infrasound and high‐speed imaging during a series of field‐scale buried explosions suggest new details about the generation and radiation patterns of acoustic waves from volcanic eruptions. We recorded infrasound and high‐speed video from a series of subsurface explosions with differing burial depths and charge sizes. Joint observations and modeling allow the extraction of acoustic energy related to the magnitude of initial ground deformation, the contribution of gas breakout, and the timing of the fallback of displaced material. The existence and relative acoustic amplitudes of these three phases depended on the size and depth of the explosion. The results motivate a conceptual model that relates successive contributions from ground acceleration, gas breakout, and spall fallback to the acoustic amplitude and waveform characteristics of buried explosions. We place the literature on infrasound signals at Santiaguito Volcano, Guatemala, and Sakurajima and Suwonosejima Volcanoes, Japan, in the context of this model.