5:15 PM - 6:45 PM
[SSS11-P05] Investigation of micro-landform by UAV Laser Survey, in the Atera fault, central Japan
Keywords:active fault, Atera fault, UAV
Introduction
Aerial laser survey data, which can remove the height of trees and other vegetation, is effective in interpreting tectonic landform in forests. Furthermore, UAV Laser Survey is effective for rapid aerial laser surveying. In this study, we conducted UAV Laser Survey on the Atera Fault, analyzed the measurement data, and deciphered the tectonic landform.
Result
Five survey points were set from the northern part to the central part of the Atera fault. Because trees are distributed at these points, it is difficult to identify the slight tectonic landform from aerial photographs. For the survey, we used a DJI Matrice 300 RTK UAV and a Zenmuse L1 laser surveying device. The ground surface obtained from survey data shows cliffs, bends in valleys, deviations in narrow grooves, and isolated hills ranging from several tens of centimeters to several meters. In addition, a lineament diagonally intersecting the general strike of the Atera fault at a low angle could be deciphered. We were able to reveal the detailed location of active faults from these landforms. Furthermore, we investigated the topography and geology around the survey points and confirmed small tectonic landforms and small-scale wetlands. We also confirmed a fracture zone and a fault plane with clay in the basement rock.
Conclusion
UAV Laser Survey was conducted at five locations from the northern to central Atera Fault, and small tectonic landform was confirmed. As a result, we revealed the detailed distribution of active faults. We also confirmed tectonic landforms and geological structures on-site. In this way, efficient active fault surveys are possible using UAV Laser Survey. In the future, we plan to conduct excavation surveys along the fault and clarify the history of its activity.
This work was supported by JSPS KAKENHI Great Number JP23K04326.
Aerial laser survey data, which can remove the height of trees and other vegetation, is effective in interpreting tectonic landform in forests. Furthermore, UAV Laser Survey is effective for rapid aerial laser surveying. In this study, we conducted UAV Laser Survey on the Atera Fault, analyzed the measurement data, and deciphered the tectonic landform.
Result
Five survey points were set from the northern part to the central part of the Atera fault. Because trees are distributed at these points, it is difficult to identify the slight tectonic landform from aerial photographs. For the survey, we used a DJI Matrice 300 RTK UAV and a Zenmuse L1 laser surveying device. The ground surface obtained from survey data shows cliffs, bends in valleys, deviations in narrow grooves, and isolated hills ranging from several tens of centimeters to several meters. In addition, a lineament diagonally intersecting the general strike of the Atera fault at a low angle could be deciphered. We were able to reveal the detailed location of active faults from these landforms. Furthermore, we investigated the topography and geology around the survey points and confirmed small tectonic landforms and small-scale wetlands. We also confirmed a fracture zone and a fault plane with clay in the basement rock.
Conclusion
UAV Laser Survey was conducted at five locations from the northern to central Atera Fault, and small tectonic landform was confirmed. As a result, we revealed the detailed distribution of active faults. We also confirmed tectonic landforms and geological structures on-site. In this way, efficient active fault surveys are possible using UAV Laser Survey. In the future, we plan to conduct excavation surveys along the fault and clarify the history of its activity.
This work was supported by JSPS KAKENHI Great Number JP23K04326.