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[HGG02-P03] Changes in roads and natural environment along active faults: a case of Atera Fault
Keywords:Atera Fault, Ancient Road, Landform
Active faults cause large earthquakes. On the other hand, it brings the blessing of forming landforms over a long period of time. The Atera Fault, located in the eastern part of Gifu Prefecture, is an active fault that extends about 66 km. In this study, we conducted a field survey in Kashimo, Nakatsugawa City, Gifu Prefecture, which located in the central part of the Atera fault and investigated the relationship between road changes and active faults, and the environment of the Tall golden rod in the vicinity of the road was investigated.
The current national road in the Kashimo area is located near the Shirakawa River, and the Taisho era national road was located 100 m to 200 m northeast of the current national road. It is also believed that the earlier road was located further to the northeast. Therefore, we attempted to extract the location of the "Nanboku Kaido" in the Edo period and the ancient roads used before the Nanboku Kaido. The two extracted roads were compared to the current national road. As a result, the Nanboku Kaido and the ancient road are located 200 m to 500 m northeast of the national road. In particular, the ancient road is located near an active fault, and it can be inferred that the road was formed along a lineament formed by the active fault. In addition, some spring waters were observed along the ancient road and along the active fault. In the Kashimo area, there are blessings from the spring water along the active fault in the form of plants and animals such as wasabi and fireflies (Harada et al., 2023). On the other hand, the non-native plant of the Asteraceae family, Tall golden rod, is found to be propagating in the vicinity of the present and Taisho era national road. Tall golden rod is feared to lead to the destruction of ecosystems and the loss of landscapes. We surveyed the distribution of the habitat of the Tall golden rod, around a national road in the Kashimo area and other living roads except for forest roads. The distribution of Tall golden rod in the Kashimo area was investigated. As a result, we confirmed the presence of the species at 186 locations. The habitat was found to be distributed mostly along busy roads and at material storage sites. This suggests that the seeds are transported mainly by vehicle travel and that habitat expansion is taking place. We also considered the spatial correlation of Tall golden rod. As a result, factors other than automobiles may also be considered. It is desirable to verify this by focusing on changes in distribution in the future.
In this study, Nanboku Kaido and ancient roads were investigated to confirm the changes in roads in the Kashimo area. The results suggest that the ancient road is influenced by an active fault. In addition, we confirmed the presence of the Tall golden rod at 186 locations along busy roads and at material storage sites. In the future, we would like to scientifically elucidate the relationship between roads, active faults, and Tall golden rod.
References
The Headquarters for Earthquake Research Promotion,2004,Long-Term Assessment of the Atera Fault Zone (Atera danso tai no choki hyoka ni tsuite), https://www.jishin.go.jp/main/chousa/katsudansou_pdf/52_atera.pdf. (October 29, 2023)
Harada et al., 2023, Exploring the blessings of active faults: a case of Atera Fault, THE PROCEEDINGS OF THE THIRTY-THIRD SYUMPOSIUM ON GEO=ENVIRONMENTS AND GEOTECHINCS, 13-14.
The current national road in the Kashimo area is located near the Shirakawa River, and the Taisho era national road was located 100 m to 200 m northeast of the current national road. It is also believed that the earlier road was located further to the northeast. Therefore, we attempted to extract the location of the "Nanboku Kaido" in the Edo period and the ancient roads used before the Nanboku Kaido. The two extracted roads were compared to the current national road. As a result, the Nanboku Kaido and the ancient road are located 200 m to 500 m northeast of the national road. In particular, the ancient road is located near an active fault, and it can be inferred that the road was formed along a lineament formed by the active fault. In addition, some spring waters were observed along the ancient road and along the active fault. In the Kashimo area, there are blessings from the spring water along the active fault in the form of plants and animals such as wasabi and fireflies (Harada et al., 2023). On the other hand, the non-native plant of the Asteraceae family, Tall golden rod, is found to be propagating in the vicinity of the present and Taisho era national road. Tall golden rod is feared to lead to the destruction of ecosystems and the loss of landscapes. We surveyed the distribution of the habitat of the Tall golden rod, around a national road in the Kashimo area and other living roads except for forest roads. The distribution of Tall golden rod in the Kashimo area was investigated. As a result, we confirmed the presence of the species at 186 locations. The habitat was found to be distributed mostly along busy roads and at material storage sites. This suggests that the seeds are transported mainly by vehicle travel and that habitat expansion is taking place. We also considered the spatial correlation of Tall golden rod. As a result, factors other than automobiles may also be considered. It is desirable to verify this by focusing on changes in distribution in the future.
In this study, Nanboku Kaido and ancient roads were investigated to confirm the changes in roads in the Kashimo area. The results suggest that the ancient road is influenced by an active fault. In addition, we confirmed the presence of the Tall golden rod at 186 locations along busy roads and at material storage sites. In the future, we would like to scientifically elucidate the relationship between roads, active faults, and Tall golden rod.
References
The Headquarters for Earthquake Research Promotion,2004,Long-Term Assessment of the Atera Fault Zone (Atera danso tai no choki hyoka ni tsuite), https://www.jishin.go.jp/main/chousa/katsudansou_pdf/52_atera.pdf. (October 29, 2023)
Harada et al., 2023, Exploring the blessings of active faults: a case of Atera Fault, THE PROCEEDINGS OF THE THIRTY-THIRD SYUMPOSIUM ON GEO=ENVIRONMENTS AND GEOTECHINCS, 13-14.