Post-seismic topographic shifts and delayed vegetation recovery in the epicentral area of the 2018 Mw 6.6 Hokkaido Eastern Iburi earthquake

IF 3 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Dou Jie, Zilin Xiang, Xiekang Wang, Penglin Zheng, Ram Avtar, Chen Xinyu, Gianvito Scaringi, Luo Wanqi, Ali P Yunus
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引用次数: 0

Abstract

The 2018, Mw 6.6 Hokkaido Eastern Iburi earthquake in Japan triggered over 10,000 landsliding in an area spanning about 500 km2, 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.
2018 年 6.6 级北海道东伊布里地震震中地区震后地形变化和植被恢复延迟
2018 年,日本北海道东部伊武里发生了威力 6.6 级地震,在面积约 500 平方公里的区域内引发了超过 10,000 次滑坡,改变了当地地形,导致山坡和山谷中松散沉积物堆积。然而,由于缺乏全面的震后滑坡清单和地形变化评估,因此无法进行定量危害评估。此外,受共震滑坡影响地区的植被恢复程度也未得到评估,而植被恢复程度是地震后泥石流危害的一个关键指标。在此,我们利用高分辨率数字高程模型和多时相卫星图像分析了地震震中地区(地震烈度 5.5)的地形变化和植被动态。我们观察到,地震使该地区整体平缓的地形变得粗糙,山坡变得陡峭。由于 2018 年后没有明显的暴雨和融雪,灾区只发生了少量泥石再移动(60 起)和新的滑坡(80 起)。此外,我们注意到震后植被恢复缓慢,这表明发生泥石流和沟壑侵蚀的可能性仍然很高,突出了持续监测和评估的必要性。
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来源期刊
CiteScore
7.20
自引率
5.10%
发文量
53
审稿时长
>12 weeks
期刊介绍: Progress in Physical Geography is a peer-reviewed, international journal, encompassing an interdisciplinary approach incorporating the latest developments and debates within Physical Geography and interrelated fields across the Earth, Biological and Ecological System Sciences.
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