2023 Vol. 66, No. 3
Article Contents

ZENG XianYang, LIU Jing, WANG Wei, YAO WenQian, WU Jing, LIU XiaoLi, HAN LongFei, WANG WengXin, XING YuKun, DU RuiLin, YANG XuQian. 2023. Machine learning in identifying and mapping the surface rupture of the 2021 MW7.4 Madoi earthquake, Qinghai. Chinese Journal of Geophysics (in Chinese), 66(3): 1098-1112, doi: 10.6038/cjg2022Q0117
Citation: ZENG XianYang, LIU Jing, WANG Wei, YAO WenQian, WU Jing, LIU XiaoLi, HAN LongFei, WANG WengXin, XING YuKun, DU RuiLin, YANG XuQian. 2023. Machine learning in identifying and mapping the surface rupture of the 2021 MW7.4 Madoi earthquake, Qinghai. Chinese Journal of Geophysics (in Chinese), 66(3): 1098-1112, doi: 10.6038/cjg2022Q0117

Machine learning in identifying and mapping the surface rupture of the 2021 MW7.4 Madoi earthquake, Qinghai

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  • High-resolution mapping of coseismic surface rupture of large earthquakes is very important for better understanding the behavior and mechanism of earthquake rupture and for quantifying earthquake hazards. High-resolution UAV imagery and topographic data provide a large volume of valuable images of the surface rupture. Manual mapping of fractures on many high-resolution images could be labor-intensive, time-consuming, and thus inefficient. Machine learning provides more possibilities for the rapid processing of such big-data images. In this paper, we demonstrate the potential of Machine learning techniques to rapid, efficient, and complete identification of fractures of the surface rupture zone using high-precision UAV images of the 2021 Madoi MW7.4 earthquake. We applied the canny algorithm (based on Convolutional Neural Networks) to discuss the processing flow and key steps of UAV digital orthophoto in detail, including preparing training data, training, and post-processing. By comparing the interpretations of manual mapping and machine recognition, the proposed method can effectively map surface rupture, providing a tool for studying future large earthquakes. Machine learning has advantages and broad prospects in quantitative studies of earthquake geology, surface processes and geomorphology.

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