Each time a natural phenomenon such as eruption, light emission, or changes in the crater lake occurred, it was reported to the central government as a phenomenon caused by a Shinto god, resulting in a raise of shinkai (a rank granted to Shinto gods) and granting of fuko (residential units (ko) assigned as prebends (fu) to support top-ranking officials, temples, shrines, and royal households such as those of the queen-consort and crown prince).
その噴火・発光、湯だまりの変異等の自然現象が起きる度に、神霊現象として中央へ報告され、神階が上昇し、封戸が与えられるなどしていた。