Causes, frequency, and relationship between huge landslide and steam eruption in volcanic fields

在地质、年代学、岩石学观测的基础上，研究了火山喷发和山体滑坡的成因、发生频率及其相互关系。有些潜水喷发与山体滑坡密切相关，但有些则不然；上升岩浆也与它们的出现有关。详细的研究揭示了近4500年来长开火山喷发和山体滑坡的频率和关系。研究了早火山1895-1896年喷发的成因和历史。

On the basis of geological, chronological, petrological observation, we investigated the geneses and frequencies of phreatic eruptions and landslides and their relationships. Some phreatic eruptions intimately relate to landslides but others do not ; ascending magma also relates to their occurrences. Detailed study revealed the frequencies and relationship of phreatic eruptions and landslides during the last 4500 years at Chokai. Genesis and history of the 1895-1896 eruption at Zao volcano was also studied.