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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Observations of eruptive activity at Santiaguito volcano, Guatemala
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Observations of eruptive activity at Santiaguito volcano, Guatemala

机译：危地马拉桑蒂亚圭托火山喷发活动的观测

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The study of active vent dynamics is hindered by the difficulty of directly observing features and processes during eruptive periods. Here, we describe some recent observations of the summit dome activity of Santiaguito volcano, Guatemala, from the vantage point of its parent, Santa Maria. We have taken 12 h of digital video of activity over a 3-year period, which includes 28 eruptions and numerous smaller gas exhalations. Santiaguito persistently extrudes a dacitic lava flow, and produces strombolian eruptions on the order of every 0.5 to 2 h; we have documented many of these eruptions as emitting from a ring-shaped set of fractures in the dome surface. The ring has apparently grown from 70 m diameter in 2002 to 120 m in 2004, which could reflect an increasing conduit opening. Eruptions typically consist of 30-60 s of vigorous emissions; measurements of emission exit velocities have ranged from 5 to 30 m/s. The observed ash bursts, correlated with measured extrusion rates, suggest an incremental plug flow through the conduit. Bubble generation and shearing at the conduit boundaries produce the ring-shaped ash and gas pulses. Continued field studies from this unique observation site may help relate summit emission characteristics to conduit geometry and eruption processes.
机译：在喷发期直接观察特征和过程的困难阻碍了主动通风口动力学的研究。在这里，我们从危地马拉的圣塔吉亚托火山的父圣玛丽亚的高角度介绍了一些近期观测到的登顶圆顶活动。我们在3年时间内拍摄了12小时的活动数字视频，其中包括28次喷发和许多次较小的呼气。 Santiaguito持续挤压出Dacitic熔岩流，并每0.5至2 h产生一次爆发性喷发。我们已经记录了许多这样的喷发，它们是从穹顶表面的一组环形裂缝中散发出来的。该环显然已从2002年的70 m直径增长到2004年的120 m，这可能反映出导管开口的增加。爆发通常由30-60秒的剧烈发射组成；排放出口速度的测量范围为5至30 m / s。观察到的灰烬爆发与测得的挤出速率相关，表明通过管道的塞流增加。在导管边界处气泡的产生和剪切会产生环形的灰烬和气体脉冲。从这个独特的观察点继续进行的野外研究可能有助于将山顶的排放特征与导管的几何形状和喷发过程联系起来。

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