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Post-seismic topographic shifts and delayed vegetation recovery in the epicentral area of the 2018 Mw 6.6 Hokkaido Eastern Iburi earthquake.
- Source :
- Progress in Physical Geography; Aug2024, Vol. 48 Issue 4, p595-614, 20p
- Publication Year :
- 2024
-
Abstract
- The 2018, M<subscript>w</subscript> 6.6 Hokkaido Eastern Iburi earthquake in Japan triggered over 10,000 landsliding in an area spanning about 500 km<superscript>2</superscript>, altering the local topography and leading to the accumulation of loose deposits on hillslopes and in valleys. However, a comprehensive post-seismic landslide inventory and an assessment of topographic changes are lacking, hindering a quantitative hazard assessment. Additionally, the extent of vegetation recovery in areas affected by coseismic landslides, a key indicator of post-seismic debris flow hazard, has not been evaluated. Here, we utilize high-resolution digital elevation models and multi-temporal satellite imagery to analyze topographic changes and vegetation dynamics in the earthquake's epicentral area (seismic intensity >5.5). We observe that the event roughened the overall gentle topography of the region and made the slopes steeper. Owing to the absence of significant rainstorms and snowmelt post 2018, only a few debris remobilizations (60) and new landslides (80) have occurred in the affected region. Moreover, we noticed a slow vegetation recovery in the post-seismic phase, suggesting that the likelihood of debris flows and gully erosion remains elevated, highlighting the need for continued monitoring and assessment. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03091333
- Volume :
- 48
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Progress in Physical Geography
- Publication Type :
- Academic Journal
- Accession number :
- 179282133
- Full Text :
- https://doi.org/10.1177/03091333241269201