Relocation of the 17 June 2017 Nuugaatsiaq (Greenland) Landslide Based on Green's Functions From Ambient Seismic Noises

Relocation of the 17 June 2017 Nuugaatsiaq (Greenland) Landslide Based on Green's Functions From Ambient Seismic Noises
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根据环境地震噪声的格林函数对 2017 年 6 月 17 日 Nuugaatsiaq(格陵兰岛)滑坡进行重新定位

DOI:
10.1029/2019jb018947
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发表时间:
2020-05
影响因子:
3.9
通讯作者:
Ni Sidao
Ni Sidao
中科院分区:
地球科学2区
文献类型:
--
作者:
Xie Jun;Chu Risheng;Ni Sidao

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滑坡是山区最危险的地质灾害之一,造成大量人员伤亡。滑坡的快速准确定位是减灾和次生灾害预警的关键。由于速度结构模型分辨率较低,在地震台网稀疏的偏远地区,滑坡定位是一个难题。由于速度结构的不确定性,环境地震噪声中的格林函数可用于校正效应。在这项研究中,我们利用基于格林函数的相对定位方法对2017年6月17日发生在格陵兰努加特西亚克的一起大型滑坡进行了定位。滑坡的定位结果与卫星图像给出的位置相差约2.5公里。这比基于传统定位方法的结果要好,传统的定位方法的偏差可达17公里。结果表明,该算法可以为全球和区域网络中的地震台站提供准确的滑坡位置,从而为次生灾害预警提供及时的帮助。
Landslide is one of the most dangerous geological hazards in mountainous regions, which causes large casualties. Fast and accurate location of a landslide is critical to disaster mitigation and early warning of secondary hazards. The landslide location is a difficult problem in a remote region with sparse seismic network due to low resolution of the velocity structure model. Green's functions from ambient seismic noises can be used to calibrate effects due to the uncertainty of velocity structure. In this study, we relocate a large landslide occurred in Nuugaatsiaq, Greenland, on 17 June 2017 using relative location method based on Green's functions from ambient seismic noises. The location result of the landslide is about 2.5 km away from the site given by satellite image. This is better than the result based on traditional location method, which has a deviation up to ~17 km. Our result demonstrates that this algorithm can provide accurate location of landslide with seismographic stations in global and regional networks, thus providing timely assistance to early warning of secondary hazards.
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