Construction of large underground caverns for the storage of crude oil in ductile rocks of Miocene volcanism

The huge caverns in Kushikino base are being constructed in autobrecciated parts of lava flows along the margin of submarine volcanoes. Although this pyroclastics are composed of various kinds of volcanic fragments, patient studies succeeded in finding out the most suitable places for construction. The following excavation insured the results of previous survey and is revealing interesting inside-structure of the Miocene submarine eruption. Les cavernes gigantesques en la base de Kushikino se construisent dans les parties autobréchiformes des coulees de lave en marge des volcans sous-marins. Malgré que les roches pyroclastiques se composent des fragments volcaniques compliqués, les études patientes laissent voir les premiere parties à la construction. L’excavation suivante s’est assurée des résultat des études avancées et a montrée des structures internes intéressantes des eruptions sous-marines miocènes.