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| | Abstract | | We conducted preliminary but high-density seismic measurements around a planted tree. It is possible to provide useful information for the transplantation or the maintenance of planted trees by evaluating root extent based on nondestructive or minimally invasive methods. Conventionally, an electrical capacitance measurement or resistivity survey has been adopted as the method. Recently, a pioneering seismic measurement was applied to the estimation of tree root distribution, however, it had fatal problems on the acquisition of seismic data but also on the analytical procedure of measured waveforms. Demonstration of seismic measurements to plant engineers was another purpose of our field test. A total of 16 azimuth lines were set around a planted tree and 3-component geophones were planted at 50cm intervals on the lines. Two DAS-1 system were deployed to record waveforms when hitting the trunk or the ground surface using a wooden hammer. Total observed traces amounted 85000 for 40 shotpoint records. As a result, the surface waves along the line on the growth direction of primary roots showed higher velocities than those along the non-oriented direction of roots. The velocity differences became more significant in the high frequency range corresponding to the depths of major roots. |
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