Landform Changes Caused by the Noto Peninsula Heavy Rain Disaster Based on Disaster Emergency Aerial Photography by GSI

Abstract

Spatial characteristics of landform-related disasters in the watersheds of small rivers on the Noto Peninsula were analyzed using aerial photographs taken by the GSI, following the heavy rainfall disaster of September 2024.

The heavy rain triggered not only new landslides and debris flows but also exacerbated landslides caused by the previous earthquake. Sediment-laden debris flows, along with driftwood, were observed in the valleys of streams. Sediment deposition on valley floors, caused by floodwaters, was particularly noticeable in areas where river bends, embankments, or riverbanks had been damaged.