Takeo Minoru, Aoki Yosuke, Koyama Takao
Japan Meteorological Agency.
Earthquake Research Institute, The University of Tokyo.
Proc Jpn Acad Ser B Phys Biol Sci. 2022;98(8):416-438. doi: 10.2183/pjab.98.022.
Modern observation systems composed of seismic, geodetic, other geophysical, and geochemical networks developed in and around volcanic areas provide a mass of knowledge about volcanic activities. This paper summarizes the magma pathway and recent volcanic activity of the Asama volcano. The seismic velocity structure beneath the Asama volcano was investigated via seismic ambient noise tomography and active source seismic tomography. The magma pathway in the upper crust beneath the Asama volcano was synthesized by combining the velocity structure with a hypocenter distribution of volcanic earthquakes and ground deformations before and after eruptions. Temporal evolutions of multidiscipline data regarding the volcanic activity from October 2003 to January 2018 revealed that the supplied amount of magma from the magma chamber and the internal condition in the shallow regions of the conduit controlled the recent eruptions.
由火山地区及周边地区开发的地震、大地测量、其他地球物理和地球化学网络组成的现代观测系统，提供了大量有关火山活动的知识。本文总结了浅间火山的岩浆通道和近期火山活动情况。通过地震背景噪声层析成像和有源震源地震层析成像研究了浅间火山下方的地震速度结构。结合速度结构与火山地震的震源分布以及喷发前后的地面变形，综合得出了浅间火山上地壳中的岩浆通道。2003年10月至2018年1月期间有关火山活动的多学科数据的时间演变表明，岩浆房供应的岩浆量以及管道浅部区域的内部状况控制了近期的火山喷发。
