[Abstract]

Pseudo Reflection Profiling (PRP) is introduced as an effective method for shallow seismic study of volcanoes. PRP is applied to seismic exploration records in Unzen Volcano in 1995 and two reflection profiles are obtained. A reflection profile of E-W line shows more complicated appearance of reflection phases in Heisei-Shinzan side than that in another side of the survey line. Another reflection profile of N-S line includes convex phases in the west of Heisei-Shinzan. Two of these reflections are common in both profiles and can be located at the boundary of the shallow aseismic region which was pointed out in the other geophysical study. Since these results are consistent with the previous reflection study and PRP requires free source location, PRP will be one of useful method for surveying shallow structure of volcanoes. Keywords:Unzen Volcano, shallow structure, controlled seismic method, Pseudo Reflection Profiling, passive seismic method.

Key words:

Unzen volcano, shallow structure, controlled seismic method, Pseudo Reflection Profiling, passive seismic method