16:00 〜 16:15
[HTT14-03] Co-seismic Landslides of the January 1st 2024 Earthquake - Noto Peninsula, Japan from LiDAR and UAV Photogrammetry
キーワード：Noto-Hanto earthquake, Landslide, LiDAR
On New Year's day 2024, a powerful earthquake shook the Noto Peninsula, sending coastal cliffs crushing inhabitations and the lifelines, scarring the hills and mountains, and eventually triggering a tsunami that inundated coastal areas. Against expectations, landslide density did not concentrate in areas near the epicentre, but at two principal locations, 7 and 11 km away from the epicentre. Using High-Resolution Topographic data from LiDAR in combination with geological maps and information, the present contribution investigated the spatial distribution and the landslides characteristics in the hill- and mountain areas.
The research methodology relies on a remote-sensing analysis of the LiDAR data before and after the earthquake. The statistical approach was completed with a mechanical model based on the Savage-Hutter model and modified to account for the earthquake acceleration, programmed as an envelope function.
Results shows that the first factor controlling the spatial distribution is a combination of geological characteristics and high-topographic areas. The size and distance travelled by the landslides was a direct correlation of the vertical drop and a topographic continuity allowing the material to reach downstream areas. The translation of material in area bellow the internal friction angle demonstrates that mass movement flew as much as the earthquake transferred sufficient momentum to keep the mass moving.
The research methodology relies on a remote-sensing analysis of the LiDAR data before and after the earthquake. The statistical approach was completed with a mechanical model based on the Savage-Hutter model and modified to account for the earthquake acceleration, programmed as an envelope function.
Results shows that the first factor controlling the spatial distribution is a combination of geological characteristics and high-topographic areas. The size and distance travelled by the landslides was a direct correlation of the vertical drop and a topographic continuity allowing the material to reach downstream areas. The translation of material in area bellow the internal friction angle demonstrates that mass movement flew as much as the earthquake transferred sufficient momentum to keep the mass moving.