Abstract
Major earthquakes cause widespread environmental and socioeconomic disruptions that persist for decades. Extensive ground disturbances that occurred during the shallow-focus Kumamoto earthquakes will affect future sustainability of ecosystem services west of Aso volcano. Numbers of earthquake-initiated landslides per unit area were higher in grasslands than forests, likely owing to greater root reinforcement of trees, and mostly initiated on ridgelines and/or convex/planar hillslopes. Most landslides traveled short distances and did not initially evolve into debris flows; resultant sediments and wood accumulating in headwater channels can be mobilized into debris flows during future storms. Fissures along ridgelines may promote water ingress and induce future landslides and debris flows that affect residents downstream. Native grasses are at risk because of habitat fragmentation caused by ground disturbances, extensive damage to rural roads, and abandonment of traditional pasture management practices. Sustainable management of affected areas needs to consider future risk of cascading hazards and long-term socioeconomic impacts.
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Acknowledgements
Support from Institute of Global Innovation Research, Tokyo University of Agriculture and Technology for two field trips to the Kumamoto site for RCS is gratefully acknowledged. The latter part of the study was supported in part by an International Collaborative Research Grant from Kyoto University, Disaster Prevention Research Institute.
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Sidle, R.C., Gomi, T., Akasaka, M. et al. Ecosystem changes following the 2016 Kumamoto earthquakes in Japan: Future perspectives. Ambio 47, 721–734 (2018). https://doi.org/10.1007/s13280-017-1005-8
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DOI: https://doi.org/10.1007/s13280-017-1005-8