We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Coseismic landslides triggered by the 2018 Hokkaido, Japan (M<sub>w</sub> 6.6), earthquake: spatial distribution, controlling factors, and possible failure mechanism.
- Authors
Wang, Fengrui; Fan, Xuanmei; Yunus, Ali P.; Siva Subramanian, Srikrishnan; Alonso-Rodriguez, Andres; Dai, Lanxin; Xu, Qiang; Huang, Runqiu
- Abstract
The 2018 Hokkaido Eastern Iburi Mw 6.6 earthquake occurred on September 6, 2018. It triggered a large amount of slope failures near the towns of Atsuma, Mukawa, and Abira, which caused more than 80% of the casualties. This study presents an inventory of 7837 coseismic landslides based on the interpretation of the PlanetScope images, covering about 24 km2 of the disrupted area. The local and global area-volume relationships have shown that the landslides mobilized about 23–38 million m3 of deposits. Most of landslides are shallow soil slides with an average size smaller than what is commonly observed for other earthquakes. Their spatial distribution shows that the mostly affected terrain has an elevation range 100–200 m.a.s.l., with slope gradients of 25–30°. The observed density of the landslides is jointly controlled by the ground motion, slope gradient, topographic wetness index, and, to a lesser degree, tectonic features, e.g., anticlines and faults. The rainfall and the influence of Typhoon Jebi were found to be of secondary importance. The slope failures are also the results of the pulse-like ground motion traits that shook the loose and crushable pumice materials that had been deposited during the eruptions of mounts Tarumae and Eniwa, and the Shikotsu caldera volcanoes, which are prone to flow-like slope failures.
- Subjects
JAPAN; LANDSLIDE hazard analysis; LANDSLIDES; EARTHQUAKES; IMAGE analysis; PUMICE; VOLCANOES
- Publication
Landslides, 2019, Vol 16, Issue 8, p1551
- ISSN
1612-510X
- Publication type
Article
- DOI
10.1007/s10346-019-01187-7