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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Twenty years (1990-2010) of geodetic monitoring of Galeras volcano (Colombia) from continuous tilt measurements
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Twenty years (1990-2010) of geodetic monitoring of Galeras volcano (Colombia) from continuous tilt measurements

机译：通过连续倾斜测量对Galeras火山（哥伦比亚）进行大地监测的二十年（1990-2010）

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摘要

Galeras - an andesitic stratovolcano part of the Galeras Volcanic Complex- is one of the most active volcanoes in Colombia. Historic activity is centered on a small-volume cone inside the youngest amphitheater, which breaches the west flank of the volcano. At least 30 confirmed eruption periods have been recorded in the past 480 years, with episodes of unrest ranging from weak fumarolic activity and ash emissions to larger explosive events. The most recent eruption periods, recorded instrumentally since 1988, have been characterized by minor explosive eruptions, and the emplacement of three crater domes and small pyroclastic flow deposits. In this paper, we discuss the evolution of volcanic activity using a 20-year-long record of tilt measurements. In particular, we focus on three episodes of unrest occurred in 1991,2006 and 2008, when the deformation was clearly associated with shallow magma intrusions, and the emplacement and destruction of crater domes. The depth of the intrusions varied from a few hundred meters (August 2005) to two kilometers (January 2009), while the volume change ranged from 10(4) m(3) (May-October 2009) to 10(6) m(3) (January 2009). A comparison with seismic data indicates that the deformation sources were located within the cloud of hypocenters of the volcano-tectonic events. The lack of a clear correlation between the volume change (and depth) of the sources and the total SO2 flux could indicate that the unrest at Galeras was related to a larger intrusive event with only a small part of the magma erupted in the form of tephra and lava domes. (C) 2017 Elsevier B.V. All rights reserved.
机译：加莱拉斯-加莱拉斯火山群的安第斯山脉平流火山部分-是哥伦比亚最活跃的火山之一。历史活动集中在最年轻的圆形剧场内的一个小体积的圆锥体上，该圆锥体突破了火山的西翼。在过去的480年中，至少记录了30个已确认的喷发期，动荡的时期从弱的火山口活动和烟灰排放到较大的爆炸事件不等。自1988年以来以仪器记录的最近喷发期的特点是发生了较小的爆炸性喷发，并形成了三个火山口穹顶和小的火山碎屑流沉积物。在本文中，我们使用长达20年的倾斜测量记录来讨论火山活动的演变。特别是，我们重点研究了1991、2006和2008年发生的三起动荡事件，当时这些变形明显与浅层岩浆侵入以及火山口穹顶的安置和破坏有关。入侵的深度从几百米（2005年8月）到两公里（2009年1月）不等，而体积变化的范围从10（4）m（3）（2009年5月至10月）到10（6）m（ 3）（2009年1月）。与地震数据的比较表明，变形源位于火山构造事件震源云内。源的体积变化（和深度）与总的SO2通量之间缺乏明确的相关性，这可能表明Galeras的动荡与较大的侵入性事件有关，只有一小部分岩浆以提弗拉形式喷发。和熔岩穹顶。 （C）2017 Elsevier B.V.保留所有权利。

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