10:00 AM - 10:15 AM
[SVC38-10] Change of the volcanic activity at Kuju volcano.
Keywords:volcanic activity, crustal deformation, geomagnetic variation, Volcanic Gas, phreatic explosion
Changes in volcanic activity of Kuju volcano began to appear around 2012. First, the GNSS observation showed that the length of the base line between the two points crossing Kuju volcano began to grow slightly. Next, the geomagnetic observation began showing the heat-reserve trend in the shallow region of Mt. Iwo from 2014. The gradual increase in fumarolic activity starts around 2015, and the slight increase in seismic activity also started around 2016.
Before the 1995 eruption, continuous volcano observation at Kuju volcano was not done, so the change of various phenomena preceding the eruption was not sufficiently obtained. We have not been able to judge whether the current volcanic activity change is an activity suggesting future eruptive activity. However, we believe that accumulation of observational data will help predict future volcanic activity. Then, by continuous observation of multiple items not only including geophysical observations but a volcano chemistry observation, the character of the volcanic activity in Kuju Volcano is grasped, and change of volcanic activity is monitored.