ON THE SEISMIC WAVE ENERGY AND THE EFFICIENCY OBSERVED IN THE FIRST KURAYOSHI EXPLOSION

Abstract

On discussing the earthquake energy, we must take into consideration the following problems: 1) the ratio of wave energy emitted from the origin to total energy of an earthquake, 2) how to get the wave energy exactly from seismogram, 3) the mechanism of generation, and transmission of wave energy. For this purpose we analysed the seismogram of the 1st Kurayoshi Explosion using our newly constructed square analogue computer. The results are as follows: the efficiency of the explosion was about 8%, the wave energy was estimated to correspond to M=2.3, and large part of energy was received as direct wave at the distance of about ISO km, and a few proportion of energy was radiated as S wave.