第2回鉾田爆破地震動の観測
1960 年 13 巻 2 号 p. 90-96
詳細
1960 年 13 巻 2 号 p. 90-96
At the midnight of August 26, 1957, the Research Group blasted about one ton of explosives at a site of an abandoned aerodrome near Hokoda town, Ibaragi Prefecture, and seismic waves from it were observed at 18 temporary stations as shown in Fig. 1 and Table 1. The shot point was shifted by 188m in the S 57° W direction from the first shot point.
Essential objects of these observations are summarized to the following two points. First, this observation forms a profile reverse to Kamaisi Explosions in order to verify the crustal structure of the North-east Japan previously obtained by us. Secondly we aim at finding the connection between the crustal structure of the northern part of Kwantô District and that of North-east Japan.
Observed travel times are given in Table 2 and Table 3. Travel time diagrams are shown in Fig. 2 and Fig. 3.
