6:15 PM - 7:30 PM
[SSS28-P25] Morphological features of offshore extension of the Futagawa-Hinagu fault zone
Keywords:Futagawa-Hinagu fault zone, right-lateral strike-slip fault, flower structure
In acroteric part of strike-slip fault annihilation mechanism, develop complex structures (e.g. Kakimi and Kato, 1994). To comprehend these structures, it is necessary construct the research technique with three-dimensionally and high precision (Abe and Aoyanagi, 2004).
We have carried out the high-resolution seismic surveys with a series of cross sectional observations at the Yatsushiro-sea. Survey area divided into two sub-areas 1) North eastern area, and 2) South western area. We describe results for each sub-area as follow:
Main fault (MA fault) with NE-SW trending is distributed in this area. In-cross-sections, sub-vertical fault deformed the seafloor and sediments. Also, observed the flower structure. And displacement of faults becomes smaller to the south.
MA fault splayed off here. Almost these faults had normal components and forming a graben structure.
As described above, we have captured the features of the deformation structures, three-dimensionally.