2:15 PM - 2:30 PM
[HDS08-03] Relationship between density of coseismic landslides and crustal deformation in the 1927 North Tango Earthquake, Japan
Keywords:1927 North Tango Earthquake, coseismic landslides, crustal deformation, triangulation, leveling
The North Tango Earthquake occurred on March 7, 1927, with its epicenter on the Tango Peninsula, Japan and displaced the Gomura and Yamada fault. The earthquake caused a total of 397.12 ha of landslides in Kyoto Prefecture alone (Kyoto Prefecture, 1930). Ishikawa et al., (1998) examined the causes of landslides and noted that the correlation with distance from the surface fault was higher than that with epicentral distance, and that the correlation with geology and amount of undulation was almost negligible. On the other hand, crustal deformation associated with these faults is evident from the results of 1st order to 3rd order horizontal triangulation and leveling conducted by Military Land Survey (1930), and then we investigated the relationship between crustal deformation and landslides.
The landslide area and the number of landslide locations in the forested area were listed for each municipality (Kyoto Prefecuture, 1930). We used the landslide area ratio which is obtained by dividing the landslide area by the area for each municipality.
We used horizontal and vertical displacement, area strain and maximum shear strain and so on for the indicator of crustal deformation.
We found that area strain and vertical displacement correlate with the landslide area ratio.
The landslide area and the number of landslide locations in the forested area were listed for each municipality (Kyoto Prefecuture, 1930). We used the landslide area ratio which is obtained by dividing the landslide area by the area for each municipality.
We used horizontal and vertical displacement, area strain and maximum shear strain and so on for the indicator of crustal deformation.
We found that area strain and vertical displacement correlate with the landslide area ratio.