Fig. 1From: Rheological properties of halloysite soil slurry: a case study of weathered tephra involved in a shallow landslide triggered by the 2018 Eastern Iburi earthquake in Hokkaido, Japana Locations of the epicenter of the Eastern Iburi earthquake (red cross) and the studied landslide in the Tomisato district (42.762°N, 141.931°E; black arrow). b Aerial view of the landslide (Geospatial Information Authority of Japan, 2018). c Lateral scarp showing a stratigraphic sequence of volcanoclastic deposits from Tarumae volcano (modified after Kameda et al. 2019). Weathered tephra samples were collected from the clay layer in the Ta-d layer that is in contact with the underlying Neogene sedimentary rock. The clay layer contains 40% halloysite (Kameda 2021)Back to article page