5:15 PM - 6:30 PM
[HDS10-P02] Relationship between landslide distribution and topographic feature and subsurface structure for the case of the 2018 Hokkaido Eastern Iburi Earthquake
Keywords:2018 Hokkaido Eastern Iburi Earthquake, Coseismic landslide
The 2018 Hokkaido Eastern Iburi Earthquake caused numerous (> 6000) shallow tephra landslides with the regional differences in the number and density of their occurrences (Ito et al., 2020). Wang et al. (2019) suggested that the heterogeneous patterns of landslide distribution are attributed to base geology, while Tajika et al. (2020) pointed out that low landslide density is observed along anticline axes.
We estimated the ridge intervals and slope degree by topographic analysis based on Parron et al. (2008) as well as the S-wave velocity structure by microtremor array survey for the partitioned areas according to the base geology and/or the density of landslide distribution.
The ridge intervals were found to be different according to the landslide distribution and base geology. It was suggested that the topography was affected by base geology and also affected landslide generation. We also obtained S-wave velocity structure to the depths of 300 m. We will further estimate the S-wave velocity data in a wider area and discuss them in connection with the topographic feature as well as landslide distribution.
Acknowledgement: We used DEM data provided by Geospatial Information Authority of Japan.
We estimated the ridge intervals and slope degree by topographic analysis based on Parron et al. (2008) as well as the S-wave velocity structure by microtremor array survey for the partitioned areas according to the base geology and/or the density of landslide distribution.
The ridge intervals were found to be different according to the landslide distribution and base geology. It was suggested that the topography was affected by base geology and also affected landslide generation. We also obtained S-wave velocity structure to the depths of 300 m. We will further estimate the S-wave velocity data in a wider area and discuss them in connection with the topographic feature as well as landslide distribution.
Acknowledgement: We used DEM data provided by Geospatial Information Authority of Japan.