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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Ballistic blocks around Kilauea Caldera: Their vent locations and number of eruptions in the late 18th century
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Ballistic blocks around Kilauea Caldera: Their vent locations and number of eruptions in the late 18th century

机译：基拉韦厄火山口周围的弹道街区：18世纪后期的发泄位置和爆发次数

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摘要

Thousands of ballistic blocks occur around Kilauea Caldera and record part of the latest major period of ex-plosive activity on the volcano, in late 1790 or within a few years thereafter. The sizes of the blocks - the larg-est of which is more than 2 m in nominal diameter - and differences in rock types allow the definition of at least 6 dispersal lobes of mostly undetermined relative age. The orientations of the lobes help approximate the locations of vents or explosion sources on the floor of the caldera, now deeply buried by younger lava flows. The vents may have been distributed northward for about 2 km from near the site of the modern Hale-ma'uma'u Crater and were apparently confined to the western half of the caldera. The blocks are entirely lith-ic except for those in one dispersal lobe, which contains cored bombs and blocks as well as juvenile lapilli. Eruption parameters calculated from EJECT! suggest that the phreatic and phreatomagmatic explosions could have been generated at the water table, about 600 m below the high point on the caldera rim.
机译：基拉韦厄火山口周围发生了数以千计的弹道封锁，记录了该火山最近一次爆炸活动的主要时期的一部分，时间是1790年末或之后的几年。块体的大小-最大的公称直径大于2 m-且岩石类型的差异允许定义至少6个弥散瓣，大多数相对年龄未定。裂片的方向有助于近似火山口地板上的通风口或爆炸源的位置，而火山口现在被较年轻的熔岩流深深地掩埋了。喷口可能已经从现代Hale-ma'uma'u火山口附近向北分布了约2公里，并且显然局限于火山口的西半部。这些块完全是石器式的，除了一个散叶中的块，其中包含有核炸弹和块以及少年青金石。根据EJECT计算出的喷发参数！这表明，在火山口边缘高点以下约600 m的地下水位可能发生了潜水和吞噬岩爆。

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