Dissection of a composite volcanic earthquake at Santiaguito, Guatemala
Dissection of a composite volcanic earthquake at Santiaguito, Guatemala
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危地马拉圣地亚哥复合火山地震的剖析
DOI：
10.1029/2009gl039370
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发表时间：
2009
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;R. Sanderson;J. Lyons;R. Escobar;G. Waite;J. Lees
与危地马拉马奎托火山喷发有关的火山地震震源是复杂的。岩石破裂、流体流动和气体膨胀发生在不同的时间尺度上，并引起叠加的地面运动，包括静态和动态变形以及大气压力扰动。这种复合事件的解剖是通过额外的地震观测，如次声，大地测量和视觉监测。对2009年1月4日爆发事件的多参数研究显示，在爆炸事件之前，大地倾斜和谐波地震次声震颤都明显增加了脱气。爆炸事件本身需要表面圆顶隆起，多次喷发脉冲，以及随后的火山建筑物的再平衡，表现在衍生的倾斜。我们在这里报告了一种综合方法来识别活跃喷发和爆炸的圣地亚哥火山的物理过程，并描述了这里发生的复合地震。
Volcano earthquake sources associated with eruptions at Santiaguito volcano in Guatemala are complex. Rock fracture, fluid flow, and gas expansion occur at variable time scales and induce superposed ground motions, including both static and dynamic deformation, and atmospheric pressure disturbances. Dissection of this composite event is facilitated through extra‐seismic observations, such as infrasound, geodetic, and visual monitoring. Multi‐parametric investigation of an eruptive event on Jan. 4th 2009 reveals increased degassing, apparent as both geodetic tilt and harmonic seismo‐infrasonic tremor, preceding an explosive event. The explosive event itself entails surface dome uplift, multiple eruptive pulses, and subsequent re‐equilibration of the volcanic edifice manifested in derived tilt. We report here on an integrated approach to discerning the physical processes at the actively effusing and exploding Santiaguito volcano and describe the composite earthquake that occurs here.