On the earthquake in the Bay of Chijiwa

[摘要] 27 persons were killed, 11 were injured and 182 houses were ruined by the earthquake occurred near Nagasaki on the 8th, of December 1922. Microseismic observations at several stations, directions and durations of the earth-sound in the epicentral region and direction and intensity of shocks, are all explained by locating the epicenter in the Bay of Chijiwa. It had the typical tectonic charactors regarding to the time distribution of after-shocks, to the distribution of the direction of the first movement at stations about the epicentre. The axis of the dislocation deduced by the first movement just coinsides with a geographical (probablly geological) feature of the locality. It caused no changes on Mt. Unzen, which is an active volcano quite near the epicentre of this earthquake. It may be supposed that this earthquake has no direct relation with the volcanic eruption of Mt. Unzen.

[学科分类] 大气科学