Abstract
The trees received the damage by landslide open cracks show abnormal phenomena such as strained tree root, tilted trunk and intertwined trunk. Therefore, these abnormal trees are a excellent sensor for detection of the open cracks and their linear depressions. Additionally, the strained root is effective for the discrimination between hanging wall of the open crack and footwall, and for the estimation of the opening direction of the open crack. The distribution pattern and movement of crown cracks of the Yotsugi Landslide, Kochi Prefecture have revealed by means of the abnormal trees.
