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An evaluation of the possibility of tectonic triggering of the Sinabung eruption

机译：对构造构造触发西那邦喷发的可能性的评估

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The aim of this work is to determine if tectonic seismicity may have had a role in triggering volcanic activity at Sinabung volcano and to evaluate the relative importance of different seismic parameters that could contribute to triggering an eruption. We focus on the potential role of static strain, including the timing and magnitude of changes in volumetric strain and the direction of principal strain to investigate the relation between tectonic strain changes and variations in volcanic activity at Sinabung volcano.Sinabung erupted first in August and September 2010, and then following three years of quiescence, a seismic swarm at the volcano began on 4 July 2013, two days after the Bireun earthquake (M-w 6.1), which was located 252 km from the volcano. Subsequent to these events a new series of eruptions started on 15 September 2013 and continues through today. Ground deformation, as measured with GPS, showed significant changes at Sinabung during the 4 months following the Bireun earthquake and before the September 15 eruption, reaching 8-11 mm of horizontal displacement.To evaluate the possibility of seismic triggering of activity at Sinabung, we used Global CMT solutions of large tectonic earthquakes within 1000 km of the volcano to estimate strain changes and compared these changes to the timing of volcanic activity and seismicity and to ground deformation. We find no unequivocal relationship between changes in the volumetric strain from the regional tectonic earthquakes and timing of volcanic activity at Sinabung. However, we find that the orientation of the extensional component of the strain produced by the Bireun earthquake is perpendicular to the strike of a mapped fault the crosses the volcano. We suggest that because the Sinabung magmatic system was already pressurized, this small change in extensional strain across this fault zone could have initiated the magma ascent and the consequent seismic swarm that led to the 2013 eruption. (C) 2018 Published by Elsevier B.V.
机译：这项工作的目的是确定构造地震活动是否可能在触发西那邦火山的火山活动中起作用，并评估可能有助于触发喷发的不同地震参数的相对重要性。我们关注静应变的潜在作用，包括体积应变变化的时间和大小以及主应变的方向，以研究西那丰火山构造应变变化与火山活动变化之间的关系。新堡在8月和9月首次爆发2010年，然后经过了三年的静止期，2013年7月4日，即距火山252公里的比勒恩地震（Mw 6.1）发生两天后，火山爆发了一个地震群。这些事件之后，一系列新的喷发始于2013年9月15日，一直持续到今天。用GPS测量的地面变形在Bireun地震后的4个月内和9月15日火山爆发之前显示出明显的变化，水平位移达到8-11 mm。为评估地震对Sinabung触发活动的可能性，使用了火山1000公里以内的大构造地震的Global CMT解决方案来估算应变变化，并将这些变化与火山活动和地震活动的时间以及地面变形进行了比较。我们发现，区域构造地震引起的体积应变变化与锡纳邦火山活动时间之间没有明确的关系。但是，我们发现由Bireun地震产生的应变的延伸分量的方向垂直于穿过火山的地图断裂的走向。我们认为，由于Sinabung岩浆系统已经被加压，横跨这一断裂带的伸展应变的微小变化可能引发了岩浆上升和随之而来的地震群，从而导致了2013年的喷发。 （C）2018由Elsevier B.V.发布

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