泸定M_(S)6.8地震对贡嘎山冰川流速时空特征的影响  

Spatiotemporal Characteristics of Glacier Velocity in Gongga Mountain Influenced by the Luding M_(S)6.8 Earthquake

作　　者：闻鑫 郭瑞 蒲颂文 江利明 WEN Xin;GUO Rui;PU Songwen;JIANG Liming(State Key Laboratory of Geodesy and Earth’s Dynamics,Innovation Academy for Precision Measurement Science and Technology,CAS,340 Xudong Street,Wuhan 430077,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,A19 Yuquan Road,Beijing 100049,China)

机构地区：[1]中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室,武汉市430077 [2]中国科学院大学地球与行星科学学院,北京市100049

出　　处：《大地测量与地球动力学》2024年第12期1225-1233,共9页Journal of Geodesy and Geodynamics

基　　金：湖北省自然科学基金(2021CFA028);国家自然科学基金(42174046);第二次青藏高原综合科学考察研究项目(2019QZKK0905)。

摘　　要：利用2022-07~11的Sentinel-1A多时相SAR数据,使用SAR影像像素偏移量追踪方法提取2022-09-05泸定M_(S)6.8地震震前、同震和震后的贡嘎山区域冰流速信息,并分析该地震对冰川运动状态的影响。结果表明:1)同震期间(2022-08-26~09-07),贡嘎山区域的冰川流速明显增加,平均值相较于震前(2022-07~08)增加约27%~75%;2)震后时段内(2022-09~11),相较于前2 a同期,海螺沟冰川、燕子沟冰川、磨子沟冰川、南门关沟冰川、大贡巴冰川和小贡巴冰川分别有57%、56%、50%、63%、63%和56%的区域流速有提升,这6条典型冰川2022年流速整体上分别提升11%、10%、9%、18%、20%和23%;3)冰川中心线的流速结果表明,同震期间冰流速的空间分布趋势明显受到地震扰动,震后各冰川中心线的空间分布趋势与前2 a同期保持较好的一致性,而冰流速水平略有提升;4)时间演化上,在同震期间和震后短期内(2022-09~10),贡嘎山区域冰流速有较明显的提升,2022-10之后各冰川流速逐渐恢复至前2 a同期水平。Using the SAR image pixel offset tracking method,we utilize multi-temporal Sentinel-1A SAR data from July to November,2022 to extract the glacial velocity information in the Gongga mountain area before,during,and after the September 5,2022 Luding M_(S)6.8 earthquake,and to analyze the impact of the earthquake on the glacial movement.The results show:1)During the co-seismic period(August 26 to September 7,2022),the glacial velocity in the Gongga mountain area significantly increased,with an average increase of about 27%to 75%compared to the pre-earthquake period(July to August 2022).2)In the post-seismic period(September to November 2022),compared to the same period in the previous two years,the velocity in areas of the Hailuogou,Yanzigou,Mozigou,Nanmenguangou,Dagongba,and Xiaogongba glaciers increased by 57%,56%,50%,63%,63%,and 56%respectively,and the overall velocity of these six typical glaciers in 2022 increased by 11%,10%,9%,18%,20%,and 23%respectively.3)The velocity results of the glacial centerlines indicate that the spatial distribution trend of glacial velocity during the co-seismic period was significantly affected by the earthquake disturbance,and the spatial distribution trend of the centerlines of various glaciers in the post-seismic period was consistent with the same period in the previous two years,with a slight increase in glacial velocity.4)In terms of temporal evolution,the glacial velocity in the Gongga mountain area was significantly enhanced during the co-seismic period and the short term after the earthquake(September to October 2022),and after October 2022,the velocity of various glaciers gradually returned to the level of the same period in the previous two years.

关 键 词：泸定地震 贡嘎山区域 冰川流速 Sentinel-1A数据 

分 类 号：P237[天文地球—摄影测量与遥感] P315[天文地球—测绘科学与技术]