Oláh László, Tanaka Hiroyuki K M, Ohminato Takao, Varga Dezső
Earthquake Research Institute, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-0032, Japan.
Wigner Research Centre for Physics of the Hungarian Academy of Sciences, 29-33 Konkoly-Thege Miklós Str., Budapest, H-1121, Hungary.
Sci Rep. 2018 Feb 16;8(1):3207. doi: 10.1038/s41598-018-21423-9.
Muography is a novel method to highly resolve the internal structure of active volcanoes by taking advantage of the cosmic muon's strong penetration power. In this paper, we present the first high-definition image in the vicinity of craters of an erupting volcano called Sakurajima, Kyushu, Japan. The muography observation system based on the technique of multi-wire proportional chamber (mMOS) has been operated reliably during the data taking period of 157 days. The mMOS measured precisely the flux of muons up to the thickness of 5,000 meter-water-equivalent. It was shown that high-definition density maps around the Craters A, B and Showa could be determined with a precision of less than 7.5 × 7.5 m which earlier had not yet been achieved. The observed density distribution suggests that the fall back deposits filled the magma pathway and increased their density underneath Craters A and B.
μ子断层扫描是一种利用宇宙μ子强大的穿透能力来高分辨率解析活火山内部结构的新方法。在本文中，我们展示了日本九州樱岛一座正在喷发的火山火山口附近的首张高清图像。基于多丝正比室（mMOS）技术的μ子断层扫描观测系统在157天的数据采集期内可靠运行。mMOS精确测量了高达5000米水当量厚度的μ子通量。结果表明，能以小于7.5×7.5米的精度确定A、B和昭和火山口周围的高清密度图，这是此前尚未实现的。观测到的密度分布表明，回落沉积物填充了岩浆通道，并增加了A和B火山口下方的密度。
