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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Magma dynamics of 2007 Stromboli effusive eruption as revealed by high precision location of seismic events
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Magma dynamics of 2007 Stromboli effusive eruption as revealed by high precision location of seismic events

机译：地震事件的高精度定位揭示了2007年斯特龙博利火山喷发的岩浆动力学

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Stromboli is considered one of the most active volcanoes in the world, and its persistent but moderate explosive activity is only interrupted by occasional episodes of more vigorous activity accompanied by lava flows. A new effusive eruption began in late February 2007 and was characterized by intense seismic activity throughout the whole period. The accurate seismic signals analysis showed the presence of families of events with similar waveform signatures (i.e., multiplets) located beneath the crater region. Since traditional location techniques do not allow obtaining reliable hypocenters, our analysis focused on high precision locations of the seismicity in order to better define the source geometry of the events. Hypocenters, therefore, have been relocated considering two steps: the first, based on a robust probabilistic approach, is used to find the absolute position of the clusters and the second exploits a master-event concept for the relative location of the events. Finally, the shape of the clusters and the temporal migration of the foci were correlated with the eruptive phases. The results show that the occurrence of a cluster of events is related to the opening and closure of a vent opened in the Sciara del Fuoco slope and, in particular, to the intrusion of a dike injected by central conduit in a radial direction, whereas another cluster lies in a narrow vertical volume positioned under the crater area. The geometry of the clusters suggests a source region depicting the shallower feeding system. Overall, the results highlight that the high precision locations method is an efficient and quick tool to obtain a better understanding of the magmatic processes occurring during an ongoing eruption.
机译：斯特龙博利火山被认为是世界上最活跃的火山之一，其持续而适度的爆炸性活动只是偶尔被熔岩流伴随着更剧烈的活动而中断。 2007年2月下旬开始出现新的喷发，其特征是在整个时期都发生了强烈的地震活动。准确的地震信号分析表明，火山口区域下方存在具有相似波形特征（即多重峰）的事件族。由于传统的定位技术不允许获得可靠的震源，因此我们的分析集中在地震活动的高精度位置上，以便更好地定义事件的震源几何形状。因此，重心的重新定位考虑了两个步骤：第一，基于可靠的概率方法，用于查找聚类的绝对位置；第二，利用主事件概念来确定事件的相对位置。最后，团簇的形状和病灶的时间迁移与爆发期有关。结果表明，一系列事件的发生与在Sciara del Fuoco斜坡中打开的通风孔的打开和关闭有关，特别是与中央导管沿径向注入的堤防侵入有关，而另一个与事件有关。团簇位于火山口区域下方的狭窄垂直空间中。团簇的几何形状表明了描绘较浅的进食系统的源区。总的来说，结果表明，高精度定位方法是一种有效且快速的工具，可以更好地了解正在进行的喷发过程中发生的岩浆作用过程。

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