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| | Abstract | | Using a conventional seismic source, we carried out a time-lapse experiment in quarry during two weeks in total in July and August, 2014. The transfer function between source and receiver is defined by the division of observed seismic record by source signatures, it is necessary to minimize temporal changes of the source signature during one month. We used a fix location for the source and kept to minimize the change of source operational condition. The source was swept from 10 to 50 Hz during 100 seconds with 5 second rest. We repeated 32 sweeps during an hour and computed an hour-long stacked waveforms. The source signature is calculated by the force to the reaction mass and base plate. The calculated transfer functions within 2 km showed very similar wave forms on P arrivals. The comparison of these transfer functions of this observation to the past observations shows large discrepancies on the waveforms due to the difference of coupling condition of source and ground, and it may suggest the difficulty of direct comparison among those observations. |
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