| 泸定Ms 6.8地震对海螺沟冰川的影响应急分析 |
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| 引用本文： | 李为乐,陈俊伊,陆会燕,单云峰,李志刚,陈宝林,伍鸾宇,许洲,李维敏,张攀,许善淼,汤明高,董秀军,赵建军,范宣梅,许强.泸定Ms 6.8地震对海螺沟冰川的影响应急分析[J].武汉大学学报(信息科学版),2023,48(1):47-57. |
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| 作者姓名： | 李为乐 陈俊伊 陆会燕 单云峰 李志刚 陈宝林 伍鸾宇 许洲 李维敏 张攀 许善淼 汤明高 董秀军 赵建军 范宣梅 许强 |
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| 作者单位： | 1.成都理工大学地质灾害防治与地质环境保护国家重点实验室, 四川 成都, 610059 |
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| 基金项目： | 国家重点研发计划2021YFC3000401国家自然科学基金41941019第二次青藏高原科学考察项目2019QZKK0201 |
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| 摘 要： | 2022-09-05四川省甘孜州泸定县发生Ms 6.8地震，震中距离海螺沟冰川约10 km，海螺沟冰川受此次地震影响如何，受到社会广泛关切。利用多时相Landsat 8和Sentinel-2光学卫星影像，基于归一化雪覆盖指数对海螺沟冰川面积进行监测，并利用Sentinel-1雷达卫星影像，基于像素偏移追踪技术对海螺沟地震前和震中位移进行监测。结果表明，2016―2022年海螺沟冰川8月份面积呈波动变化趋势，与日平均最高气温具有负相关性，冰川运动速度与地形坡度和日平均最高气温具有正相关性。泸定地震未造成海螺沟冰川运动速度大范围显著增大，但对冰瀑布前缘区域扰动明显。震后冰崩直接致灾可能性较小，但增加了泥石流致灾风险。
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| 关 键 词： | 泸定地震 海螺沟冰川 遥感监测 像素偏移追踪 归一化雪覆盖指数 应急分析 |
| 收稿时间： | 2022-09-18 |
Emergency Analysis of the Impact of the Luding Ms 6.8 Earthquake on Hailuogou Glacier |
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| Affiliation: | 1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | Objectives On 5th September 2022, an Ms 6.8 earthquake struck Luding County, Ganzi Prefecture, Sichuan Province, China, with the epicenter about 10 km away from Hailuogou Glacier. The affect of this earthquake on Hailuogou Glacier has been widely concerned by the society. Methods Firstly, the glacier area is monitored based on normalized difference snow index using multi-temporal Landsat 8 and Sentinel-2 optical satellite images. Secondly, Sentinel-1 synthetic aperture radar satellite image is used to monitor the displacement before and during the Luding earthquake based on pixel offset tracking technology. Results The results indicate that the area of Hailuogou Glacier shows a shaking trend from 2016 to 2022, which have a negative correlation with the daily average maximum temperature. While the velocity has a positively correlation with the slope gradient and the daily average maximum temperature. The Luding earthquake did not cause a significant increase in the velocity of Hailuogou Glaciers in a large range, but it significantly disturbed the front area of the ice waterfall. Conclusions The possibility of direct disaster caused by ice avalanches after the earthquake was low, but which increased the risk of disaster caused by debris flow. |
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