Fault-related features and restoration of fault slips revealed by airborne laser imagery along the Senya fault and Adera fault

Nakata, Takashi*; Kumamoto, Takashi*; Okumura, Koji*; Goto, Hideaki*; Kumahara, Yasuhiro*; Nohara, Tsuyoshi   ; Sato, Masaru*; Iwanaga, Shoji*

Laser imagery technique is applied to obtain comprehensive features of typical reverse fault (Senya fault in NE Japan) and strike-slip fault (Adera fault in Central Japan). We test several methods for obtaining fault slip from detailed DEM images. Using the visual analyzer "Geo-Graphia", several three-dimensional laser imageries are processed around Senya hill, especially along the surface fault ruptures associated with 1896 Rikuu earthquake. We compared amount of fault slips along the fault ruptures measured by field work (Matsuda et al., 1980) with that obtained by automatic and manual profiling using detailed DEM. Three-dimensional laser imageries are also processed along Adera fault, and slip vectors are restored based on successively faulted terrace risers around Sakashita town.