Database of reflection surveys in Japan and pattern of active faults in seismic reflection profile

After the 1995 Hyogoken-Nanbu earthquake, the Minister of Education, Culture, Sports, Science and Technology have funded subsidy for local governments to survey active faults. By the end of 2001, 90 faults have been surveyed by local governments. We collected 84 seismic reflection profiles obtained by these surveys and made a database. The database recorded names, locations, sense of faults, and geological conditions of the seismic reflection profiles. We divided faults’appearance of these profiles into eight types according to the pattern of reflection surfaces in the reflection profiles ; that is, faults are recognized as (1) step (13 profiles), (2) scarp (37 profiles), (3) discontinuity of reflection surfaces (4 profiles), (4) step and scarp (20 profiles), (5) step and discontinuity of reflection surfaces (1 profile), (6) step and reflector of fault plane (3 profiles), (7) scarp and reflector of fault plane (3 profiles), and (8) discontinuity of reflection surfaces and reflector of fault plane (3 profiles). Most of reflection profiles of (1), (2), (4), (6) and (8) types are obtained across reverse faults. So, these results mainly reflect characteristics of reverse faults

The verification of northern extension of the Takashozu fault based on Ultra-Shallow Seismic Reflection Survey

《論文》departmental bulletin pape