2021 Volume 32 Issue 3 Pages 79-88
In the volcanic region, the topography of fault displacement is unclear, so it is necessary to develop new methods in addition to conventional methods such as aerial photo interpretation and field surveys. In this study, we developed SPI distribution maps using slope and flow accumulation to investigate how active structures are represented around the 2008 Iwate-Miyagi Nairiku Earthquake (Mw 6.9) site. The Stream Power Indices (SPI) distribution is not as suitable for extracting edges as the slope and relative relief distributions, but it can clearly represent the knickpoints caused by active tectonics and differential erosion in a river system.
