Konstantinou K I
Department of Earth Sciences, National Central University, Jhongli, 320, Taiwan.
Sci Rep. 2020 Sep 22;10(1):15423. doi: 10.1038/s41598-020-71991-y.
Kolumbo submarine volcano lies 7 km NE of Santorini caldera and its last eruption which occurred in 1650 AD, caused damage and casualties to the nearby islands. Here a simple model of a chamber, containing silicic magma underlain by a smaller quantity of mafic magma, is utilised in order to understand the chamber behaviour during the 1650 AD eruption. Results show that in order to reproduce the duration (83-281 days) and the dense rock equivalent volume ([Formula: see text]) of the eruption, initial overpressure in the chamber should be around 10 MPa and the mafic magma should occupy up to 5% of the chamber volume. It is found that the time needed to inject mafic magma equal to 1-15% of the chamber volume varies between 1.4-13.7 ka, if the radius of the chamber is about 1500 m as inferred from tomographic images. These long recurrence times agree well with the small number of eruptions ([Formula: see text]) within a period of > 70 ka and suggest that an eruption in the near future is unlikely. Volcanic activity at Kolumbo is probably triggered by a combination of exsolved volatiles and a small but steady influx of mafic melt in the chamber.
科伦波海底火山位于圣托里尼火山口东北7公里处，其最后一次喷发发生在公元1650年，给附近岛屿造成了破坏和人员伤亡。在此，我们使用了一个简单的模型，该模型包含一个由少量镁铁质岩浆支撑的硅酸岩浆房，以了解公元1650年喷发期间岩浆房的行为。结果表明，为了重现喷发的持续时间（83 - 281天）和喷发的致密岩石等效体积（[公式：见原文]），岩浆房的初始超压应约为10兆帕，且镁铁质岩浆应占据岩浆房体积的5%。研究发现，如果根据层析成像图像推断岩浆房半径约为1500米，那么注入相当于岩浆房体积1 - 15%的镁铁质岩浆所需时间在1.4 - 13.7千年之间变化。这些较长的复发时间与70千年以上时间段内少量的喷发次数（[公式：见原文]）非常吻合，并表明近期不太可能发生喷发。科伦波的火山活动可能是由析出的挥发物和岩浆房中少量但稳定的镁铁质熔体流入共同触发的。
