Geoinformatics Unit

Preliminary Landslide Mapping Following the M6.7 Earthquake in Hokkaido, Japan, on September 6, 2018

September 13, 2018

On September 6, 2018, an M6.7 earthquake occurred in the Hokkaido region, eastern Japan, causing severe damage and casualties. The Geoinformatics Unit from RIKEN Center for Advanced Intelligence Project, Tokyo Institute of Technology, and the International Research Institute of Disaster Science conducted a preliminary damage mapping using satellite remote sensing imagery (ALOS-2) acquired from the affected areas. The ALOS-2 data used in this analysis was provided by the large-scale disaster satellite image analysis support team of the Japan Aerospace Exploration Agency (JAXA).

To detect the areas where landslides occurred, we carried out a change detection analysis using a pre-event SAR data acquired on August 23, 2018, and post-event SAR data obtained in the same day of the mainshock, on September 6, 2018. The image below shows detected landslide (yellow segments) in the northwest areas of Atsuma town.

More details:
Analysis report LINK

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Detected landslide (yellow segments) in the northwest areas of Atsuma town.