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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Decompression rate of magma at fragmentation: Inference from broken crystals in pumice of vulcanian eruption
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Decompression rate of magma at fragmentation: Inference from broken crystals in pumice of vulcanian eruption

机译：碎裂时岩浆的减压速率：来自火山喷发浮石中破碎晶体的推断

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摘要

Decompression rate of magma at fragmentation (immediately before or after fragmentation) was determined using broken crystals found in the pumices ejected during the vulcanian explosion of Sakurajima volcano, Japan. The combined analysis of textural data obtained from the natural pumice samples and a simple model for the crystal fracturing in vesiculating viscous magma indicated a decompression rate 7.0 ×l0~3-7.8×l0~4Pa/s for the ejecta produced during the later phase of vulcanian explosion. This result suggests that the short duration of the vulcanian explosion is controlled by the rapid decrease of the magma ascent rate to a vent. An understanding of the control mechanism of the termination of an eruption by precise prediction of the eruption process is essential for both volcanology and hazard mitigation.
机译：使用在日本樱岛火山的火山爆发期间喷出的浮渣中发现的破碎晶体，确定了破碎时（在破碎之前或之后）岩浆的减压速率。从天然浮石样品获得的质地数据和一个简单的胶化岩浆破裂中的晶体破裂模型的组合分析表明，在后期的喷射过程中，喷出物的减压率为7.0×l0〜3-7.8×l0〜4Pa / s。火山爆发。这个结果表明，火山爆发的短持续时间是由岩浆上升到喷口的速率迅速降低所控制的。通过精确预测喷发过程来了解喷发终止的控制机制，对于火山学和减灾均至关重要。

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