According to historic records on disasters, it is pointed out that volcanic activities may have started increasing since the occurence of Great East Japan Earthquake.
In September, 2013, OYO conducted airborne survey in Mt. Fuji for exploring magma activities by analysing changes of gravity and magnetic force. The photograph on left above shows the airborne survey opned for media. After Great East Japan Earthquake, OYO conducted exploration of volcanic structure in Mt. Unzen, Mt. Asama, Kirishima Volcanoes, Mt. Tarumae, Mt. Bandai, Mt. Yakidake, Mt. Ontake.

A technical seminor named “Preparation for volcanic disasters” was held in the 40th OYO Fair in October, 2013, which introduced some examples of disasters associated with volcanic erruptions and countermeasures for them. OYO has strength to offer countermeasures on both hardware and software.

OYO was in charge of installing seismometer at 47 sites for 42 volcanoes in a project of Japan Meteorological Agency. The photographs on center and right above are showing a observation well in Sakura-jima in Kagoshima prefecture.
Small equipment for gas observation was released in the OYO Fair in October, 2014. This is a tool for measuring gas contents in realtime even in case that people cannot enter the sites, such as a case just after a volcanic erruption.