The outline of the 2011 eruption at Shinmoe-dake (Kirishima), Japan
The outline of the 2011 eruption at Shinmoe-dake (Kirishima), Japan
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DOI：
10.5047/eps.2013.03.016
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发表时间：
2013-01-01
影响因子：
3
通讯作者：
Maeno, Fukashi
中科院分区：
文献类型：
--
作者：
Nakada, Setsuya;Nagai, Masashi;Maeno, Fukashi
2011年新萌岳爆发的高潮阶段是一个混合物的subplinian和火山喷发事件，火山口内连续的熔岩积累（熔岩圆顶），并重复火山事件后圆顶的增长。它之前是通货膨胀和地震活动增加了大约一年，一周前是蒸汽岩浆爆炸。小火山碎屑流和火山灰云浪涌形成的subplinian事件，当喷发柱达到最高水平和通风口扩大。一个熔岩穹丘，被挤压到接近于次布里尼事件的出口，通过向上膨胀和填充火山口而生长。在火山口被熔岩覆盖后，一个强烈的火山事件发生在圆顶的底部，膨胀的圆顶变得瘪了。在那之后，火山事件重复了三个月。火山口的同时喷发风格（火山事件，连续的火山灰排放和圆顶生长）和火山阶段的一些蒸汽岩浆事件可能是由于一个复杂的上层管道系统在水饱和的围岩。
The climactic phase of the 2011 eruption at Shinmoe-dake was a mixture of subplinian and vulcanian eruptive events, successive lava accumulation (lava dome) within the crater, and repetition of vulcanian events after the dome growth. It was preceded by inflation and elevated seismicity for about one year and by phreatomagmatic explosions of one week before. Small pyroclastic flows and ash-cloud surges formed during the subplinian events, when the eruption column reached the highest level and the vent was widened. A lava dome, which was extruded close to the vent of subplinian events, grew by swelling upward and filling the crater. After the vent was covered by the lava, an intense vulcanian event occurred from the base of the dome and the swelled dome became deflated. After that, vulcanian events were repeated for three months. Simultaneous eruption styles in the crater (vulcanian events, continuous ash emission and dome growth) and some phreatomagmatic events in the vulcanian stage probably are due to a complex upper-conduit system developed in water-saturated country rock.