地熱地帯での反射波の検出に関する一考察

抄録

Most geothermal areas in Japan are located in the volcanic provinces of complex geology. The seismic reflection method which is considered to be one of the best of the existing exploration techniques for the detailed subsurface structures has been applied to clarify the deep geothermal, geological setting. However the most results obtained are far from satisfactory.
Some of the reasons for it are,
1) actually, there exist no reflecting boundaries,
2) too many conflicting reflections returning from subsurface produce complex reflection patterns.
Supposing that the second case is true, there may be certain methods for decomposing such events to get true subsurface structures.
In this paper, one method of separating reflection events through a moveout domain transformation using a stacking technique along each reflection lineup is presented.
The basic idea is examined by some synthetic seismogram sections proving its effectiveness, then the underlying basic concepts also studied in spatial frequency domain using characteristic transfer functions.
The basis of this method is one of the reflection picking techniques, thus the results are easily displayed by a conventional x-y plotting device.