10:45 AM - 10:48 AM
[SIT36-P01] Towards Imaging of the Volcanic Hydrothermal System by Integrated Monitoring of Electromagnetic and Seismic ACROSS
Keywords:volcanic hydrothermal system, Integrated ACROSS, dense observation network, continuous monitoring, structure sensitive material
Among the active volcanoes in the world, Kusatsu-Shirane volcano will be one of the vest location for the developmental experiments of the active monitoring instrumentations and the supporting analyses. For example, one of the targets of peculiar phenomena at the Kusatsu-Shirane volcano will be occurrence of the temporal variation of resonance frequency of long-period seismic events associated with a seismically active period between 1989 and 1993 (Kumagai et al, 2002; Nakano & Kumagai, 2005). They proposed a physical model, i.e. a crack filled with hydrothermal fluids and temporal change of the resonanse frequency due to the changes of steam-liquid ratio. Such a phenomenon should be associated with the changes of nearby electromagnetic field, so that fluid movements or geothermal structure could also chage.
Integrated Monitoring of Electromagnetic and Seismic ACROSS would provide more detailed information for such phenomena when a dense electromagnetic and seismic observation network. It obviously needs to develop more stable observation system, such as utilization of MI sensor magnetmeters and loop-antena for signal genertion especially in electromagnetic ACROSS.