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However, since it is difficult to fire explosives in shallow water around Japan because of fishing problems, the data on the upper part of crust could not be obtained fairly often. In order to improve this deficiency, observation with an ocean bottom seismograph was carried out in July, 1969 in the case of the Off Shakotan Explosion. The direct analogue recording technique was applied for the magnetic tape recording, so that the total recording time was extended to 600 hours with a 7 inch magnetic tape and with a tape speed of 0.5 mm/s for the frequency band 0.3-40 Hz. The geophone used was of vertical type with a natural frequency of 4.5 Hz manufactured by Geo Space Company. The maximum depth for this ocean bottom seismograph is 500m and the actual observation was carried out at the depth of 116m. The charge size for eleven shots was 600 kg and that for two shots was 300 kg. Clear first arrivals and direct water waves were recorded. 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