Sound produced by the rapidly inflating Santiaguito lava dome, Guatemala
Sound produced by the rapidly inflating Santiaguito lava dome, Guatemala
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危地马拉圣蒂亚吉托熔岩穹顶快速膨胀产生的声音
DOI：
10.1029/2010gl045217
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发表时间：
2010
影响因子：
5.2
通讯作者：
J. Lees
中科院分区：
文献类型：
--
作者：
Jeffrey B. Johnson;J. Lees
圣地亚哥（危地马拉）卡连特熔岩穹顶的垂直膨胀与爆炸性喷发同时发生，并产生次声波，次声波峰值通常在 0.5 至 2 Hz 之间，振幅高达 5 Pa（距喷口约 1 公里）。高达 ∼1 m 的膨胀速度很快（在 ∼2 秒内），并且可以覆盖 ∼200 米直径圆顶的整个表面。我们使用粒子图像测速技术来量化穹顶隆起的时间历史，并证明火山固体表面的偏转可以产生振幅为几 Pa 的次声波。体积位移历史用于模拟线性体积声源，包括紧凑的和有限范围的。合成波形在时间和频率内容方面与记录的次声相匹配。对于距离喷口 3.3 公里的站点，振幅拟合非常好，而对于受喷口附近地形遮挡的站点则不太适合。
Vertical inflation of the Caliente lava dome at Santiaguito (Guatemala) occurs coincidentally with the onset of explosive eruptions and produces infrasound that is generally peaked between 0.5 and 2 Hz with amplitude of up to 5 Pa (at ∼1 km from vent). Inflation of up to ∼1 m progresses rapidly (within ∼2 s) and can encompass the entire surface of the ∼200‐m‐diameter dome. We use particle image velocimetry to quantify the time history of dome uplift and demonstrate that deflection of a volcano's solid surface can generate infrasound waves with amplitudes of a few Pa. The volumetric displacement history is used to model linear volumetric acoustic sources, both compact and of finite extent. Synthetic waveforms match recorded infrasound in terms of timing and frequency content. Amplitude fit is very good for a station located 3.3 km from the vent and less good for stations shielded by near vent topography.