Imaging the conduit size of the dome with cosmic-ray muons: The structure beneath Showa-Shinzan Lava Dome, Japan
Imaging the conduit size of the dome with cosmic-ray muons: The structure beneath Showa-Shinzan Lava Dome, Japan
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DOI：
10.1029/2007gl031389
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发表时间：
2007-11-22
影响因子：
5.2
通讯作者：
Niwa, K.
中科院分区：
文献类型：
--
作者：
Tanaka, H. K. M.;Nakano, T.;Niwa, K.
我们开发了一种射线照相技术，使用宇宙射线μ子成像地下管道形状。以位于日本北海道的昭和-新山熔岩丘为例进行了试验测量。一个面积为6000 cm 2的μ子探测器被设置在熔岩圆顶的脚下。在探测器中的核乳胶胶片中记录的μ子轨迹被分析，以确定沿着沿着不同射线路径通过熔岩圆顶下的次表面的能量吸收水平。μ子探测器的典型角分辨率为10 mrad，对应于1 km距离处10 m的空间分辨率，这很难用地震学技术解决。我们绘制了不同吸收的宇宙射线μ子，它取决于穹顶下不同的厚度和密度。我们成功地对导管形状进行了成像，并确定导管直径为102 +/- 15 m，假设圆顶下方观察到的高吸收区域位于通风口区域。
We developed a radiographic technique to image a subsurface conduit shape using cosmic-ray muons. The test measurement was performed in Showa- Shinzan lava dome located in Hokkaido, Japan as an example. A muon detector with an area of 6000 cm 2 was set up at the foot of the lava dome. Muon tracks recorded in nuclear emulsion films in the detector were analyzed to determine the level of energy absorption along different ray paths through subsurface beneath the lava dome. A typical angular resolution of the muon detector of 10 mrad corresponds to a spatial resolution of 10 m at a distance of 1 km, which is difficult to be addressed with seismological technique. We mapped differentially absorbed cosmic- ray muons, which depend upon the varying thickness and density beneath the dome. We successfully imaged the conduit shape and determined a conduit diameter of 102 +/- 15 m, assuming the observed high absorption region beneath the dome is localized in the vent area.