Abstract
Since September 1957, several scores of tons of explosives have been detonated many times, for quarrying purpose connected with construction of a rock-fill dam at the site of Miboro-valley, Gihu Prefecture.The Research Group for Explosion Seismology has carried out successfully systematic observations of seismic waves from the six quarry blasts, in order to get information about the crustal structure in central Japan, over Kwantô, Tyûbu, Kinki and Tyûgoku Districts. Our temporary observation stations, 75 in total, were spread to a distance of about 300km mainly along the Eastern profile and the Western profiles A and B, as shown in Figs. 4 and 5. Observed data and time-distance graphs of first seismic arrivals are given in this paper.
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