Thermokarst lake development in the permafrost region is accelerating due to climate change. These lakes, formed by thawing permafrost, can combine and form drainage networks, significantly altering hydrological processes. This study analyzed terrain in the central Lena River basin of East Siberia to investigate this process. By combining satellite imagery and digital elevation models, we found that while small lakes are currently abundant, terrain analysis suggests a potential for future drainage network development. As thermokarst lakes continue to expand, they may eventually drain, leading to irreversible ecological and hydrological changes. Continued monitoring is necessary to assess these spatiotemporal dynamics.

This study identifies the tendency for different industries in Japan to be located in the same area (co-location). In other words, the tendency for geographical proximity between different industries, based on data on the number of employees in each industry at the 3-digit level from the Basic Survey of the Economic Census 2014, using co-occurrence analysis.

Cadastral maps from the Meiji period (1868-1912) are used in various academic fields because they depict in detail the landscape before it was transformed by modernization. However, there are large regional differences in the types of cadastral maps, the period in which they were produced, and their material characteristics, making it important to conduct basic research in each region. This presentation will discuss the results of the survey of Tokushima Prefecture from 1875 to 1894.

The Association of Japanese Geographers was founded in 1925, and this year 2025 marks its 100th anniversary. Initially, the association aimed to pursue geography purely as an academic discipline, but later faced many national and social challenges. We have continued to question the essence of geography while responding to the various challenges. We need to listen more than ever before to a variety of opinions and aim to become a more open association. In this symposium, we would like to look back on the 100th year of the association and reaffirm the importance of our future efforts.

To maintain yak and other livestock in Sagarmatha National Park, it is time to provide support from the outside so that the local people can learn how to prevent the disappearance of the livestock, and so that they can see this as a regional problem rather than a problem for their households alone.

The 2024 Noto Peninsula earthquake occurred on January 1, 2024, with a depth of 16 km and a magnitude 7.6. Liquefaction occurred and destroyed many houses and roads in the areas of Awagasaki, Kanazawa City, Uchinada Town, and Osaki, Kahoku City, in Ishikawa Prefecture, which are about 100 km away from the epicenter of the earthquake. The liquefaction occurred along the shore of a lagoon. Such topography is often seen along the Japan Sea coast.

This study presents a preliminary tsunami hazard assessment for active volcanoes in the Kuril Islands, focusing on sector collapse. Based on Zone et al. (2022), 19 volcanoes were evaluated using the height-to-distance ratio (H/D), eruption frequency, and tsunami history. Seven volcanoes, including Etorofu-Atosanupuri, were classified as high risk. Past tsunamis in 1933 from Kharimkotan and Alaid highlight the region’s volcanic tsunami threat. Etorofu-Atosanupuri’s proximity to Hokkaido necessitates immediate monitoring. No high-risk volcanoes were identified on the larger southern islands, such as Shiretoko Peninsula, Kunashiri Island, and Uruppu Island.

In hydrogeological research, the analysis of long-term continuous hydrological observation (so-called hydrology and water quality) data is a basic and important method, but the type of data used and how it is handled vary depending on the research theme and purpose, which can lead to significant differences in analysis results and their interpretation. Many of the data we have collected with great effort are left unused. We have considered "representativeness" in order to make use of valuable field observation data, but this is not yet sufficient, and we would like to continue our consideration.

This study investigates the relationship between disaster preparedness and neighborhood ties among Chinese immigrants in Japan. Using data from an online social survey of foreign residents, responses from 467 Chinese participants were analyzed. The findings reveal that ties with Japanese neighbors were significantly and positively associated with overall disaster preparedness, while ties with co-national neighbors showed no significant effect. Furthermore, the degree of neighborhood interaction, rather than the scale of the neighborhood network, played a more critical role in enhancing disaster preparedness among Chinese immigrants in Japan.

This study investigates the relationship between land use and topography in Kawagoe City, a peri-urban rural area. Kawagoe City plays a crucial role in balancing urban development and rural preservation. Using GIS analysis, we compare historical land use data to visualize changes over time and assess their alignment with topographical features and urban planning policies. Additionally, disaster risks and their implications for sustainable land use are evaluated. The findings aim to highlight the importance of topography-informed land use planning and provide insights for sustainable urban-rural coexistence in Kawagoe and similar regions.