South Korea is affected by the monsoon front from late June to late July of each year. As a result, the country is constantly working to prepare for the potential damage caused by monsoons. Gyeongju City in Gyeongsangbuk-do, in particular, is working intensively to prevent monsoon-related landslides.

2024 Gyeongju Tohamsan Mountain Landslide Status

Green Korea\'s "Gyeongju National Park Tohamsan Landslide Risk Report" identified approximately 24 landslides in the Tohamsan mountainous area. They emphasized that Gyeongju, as a major typhoon path, must pay close attention to landslide risks. Typhoon Hinnamnor caused landslides in the Tohamsan area of Gyeongju, Gyeongsangbuk-do, in September 2022.

Although the landslide occurred nearly 18 months ago, the affected area continues to suffer damage as soil and rocks flow down. In such a case, on-site recovery will probably to be slow. As a result, Nara Space Technology investigated the continuously occurring Gyeongju landslide using high-resolution satellite and aerial imagery in order to respond quickly.

Analyzing Aerial Imagery of Tohamsan Mountain Landslide

Field surveys conducted by visiting landslide-affected areas have the advantage of allowing for detailed investigation of concentrated areas. However, they are difficult to execute over large areas and pose a risk of human casualties. In such cases, aerial and satellite imagery, which can provide an overview of large areas, allow for quick and accurate analysis.

Although the providing interval for aerial images is typically between one and two years, the continuous damage caused by landslides in Gyeongju\'s Tohamsan required analysis using these images due to their ability for detailed examination.

Using aerial images provided by the National Geographic Information Institute, we concentrated on the Seokguram area, which is expected to have suffered the most severe damage among the areas most susceptible to landslides.

Gyeongju is Under a Landslide Emergency: Satellite Imagery is the Solution

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