Cosmic-ray muon imaging of magma in a conduit: Degassing process of Satsuma-Iwojima Volcano, Japan
Cosmic-ray muon imaging of magma in a conduit: Degassing process of Satsuma-Iwojima Volcano, Japan
复制标题
DOI：
10.1029/2008gl036451
复制
发表时间：
2009-01-06
影响因子：
5.2
通讯作者：
Taira, Hideaki
中科院分区：
文献类型：
--
作者：
Tanaka, Hiroyuki K. M.;Uchida, Tomohisa;Taira, Hideaki
Muon射线照相术基本上可以提供穿过平行于探测器平面的物体的横截面，沿着所有Muon路径的平均密度被投影在上面，有点像X射线射线照相术。最近，乳胶片的使用为我们提供了可视化火山内部的线索。为了在更短的时间内对一座更大的火山进行成像，我们需要一个更大的探测器来收集更多的缪子事件。然而，成像所需的时间将与检测面积成正比。为了解决这一问题，我们研制了一种便携式组装式宇宙射线缪子望远镜模块，用于成像山道中岩浆的密度分布。日本，岩田湖火山。在火山脚下设置了一个面积为1m2的Muon探测器。我们绘制了不同吸收的宇宙射线介子图，这取决于陨石坑底部不同的厚度和密度。假设密度异常局限于喷口区域，我们成功地成像了管道内的密度分布和管道形状。观测到的岩浆头部位置与K.Kazahaya等人提出的流纹岩系统脱气模型一致。在2002年。引用：Tanaka，H.K.M.，T.Uchida，M.Tanaka，H.Shinohara，和H.Taira(2009)，《管道中岩浆的宇宙射线Muon成像：日本萨玛-岩岛火山的脱气过程，地球物理》。研究报告，36，L01304，DOI：10.1029/2008GL036451。
Muon radiography can provide essentially a cross section through the object parallel to the plane of the detector, on which the average density along all the muon paths is projected, somewhat like X-ray radiography. Very recently the use of emulsion films has given us a clue for visualization of the interior of volcanoes. To image a larger volcano in shorter time, we need a larger detector to collect more muon events. However, the time required for imaging will be proportional to the detection area. In order to overcome this problem, we developed a portable assembly type cosmic-ray muon telescope module to image the density distribution of magma in the conduit of Mt. Iwodake volcano, Japan. A muon detector with an area of 1 m 2 was set up at the foot of the volcano. We mapped differentially absorbed cosmic-ray muons, which depend on the varying thickness and density beneath the crater floor. We successfully imaged density distribution in the conduit as well as the conduit shape, assuming the density anomaly is localized in the vent area. The observed location of the magma head is consistent with the degassing model of rhyolitic systems proposed by K. Kazahaya et al. in 2002. Citation: Tanaka, H. K. M., T. Uchida, M. Tanaka, H. Shinohara, and H. Taira ( 2009), Cosmic-ray muon imaging of magma in a conduit: Degassing process of Satsuma-Iwojima Volcano, Japan, Geophys. Res. Lett., 36, L01304, doi: 10.1029/2008GL036451.