Fault-related Features and Restoration of Fault Slips revealed by Airborne Laser Imagery along the Senya Fault and Adera Fault

Abstract

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