报告1题目：3D displacement fields from SAR amplitude images: Applications to earthquake, volcano and underground nuclear test 

　　报 告 人：王腾 

　　时    间：2020年12月18日(周五) 9:30-10:30 

　　线下地点：地理资源所A0901会议室 

　　线上地点：腾讯会议室 222 977 320 

　　报告人简介：北京大学地球与空间学院固体地球物理系助理教授，博雅青年学者。2010年博士毕业于武汉大学和意大利米兰理工大学，长期从事雷达影像测地学与地表形变解译研究。致力于将高分辨率地表形变观测与地震波、地球动力学模型及构造地质解译结合，探索多种地下过程的物理机制。发表论文三十余篇，包括Science，Nature Communications，PNAS和Nature Geoscience等。 

　　报告摘要：Synthetic aperture radar (SAR) imagery is a powerful remote-sensing technology that allows for mapping the surface displacement with the resolution of a few meters. Although Interferometric SAR (InSAR) has been widely used in earth science studies, applications often suffer from decorrelation in the area of large displacement gradient, causing data gap near the ruptured crust. Pixel offsets between SAR amplitude images can provide unambiguous ground displacement measurements in both the radar line-of-sight (range) direction and the along-track (azimuth) flight direction, allowing for deriving complete (3D) displacement in the near field. Here I will present how SAR amplitude images can help us better understand geodynamic processes via three independent cases. The three applications demonstrate that SAR amplitude information is important for revealing unprecedented displacement field near the ruptured crust. Such detailed geodetic measurements can bring new knowledges about the deformed crust. 

　　报告2题目：Quantification of groundwater storage and slow-moving landslide dynamics from ground, air and space 

　　报 告 人：胡燮 

　　时    间：2020年12月18日(周五) 10:30-11:30 

　　线下地点：地理资源所A0901会议室 

　　线上地点：腾讯会议室 222 977 320   

　　报告人简介：休斯顿大学土木与环境工程学院及美国国家激光雷达测绘中心助理教授。07级中国地质大学(武汉)学士，武汉大学硕士，美国南卫理公会大学博士，加州大学伯克利分校博士后。研究主要集成SAR遥感和其他大地测量和气象水文资料，解译地表过程及地质灾害机制。发表论文 12 篇，近五年第一作者发表9 篇文章均为Nature Index/一区期刊，包括 Nature Communications, EPSL, GRL, JGR, RSE。获NASA地球与空间科学研究基金和国家优秀自费留学生奖。   

　　报告摘要：Water acts as a controlling agent in various surface processes and geohazards. The elastic mass loading and poroelastic volume strain in the surface and shallow environments deform the Earth and perturb the stress fields with orders of magnitude difference. SAR remote sensing has been used to measure large-scale ground deformation over inaccessible landscape with weekly to biweekly updates. Incorporated with interdisciplinary geological and seismic catalogs as well as in-situ geodetic and hydroclimatic observations from subsurface, surface, air and space, we are allowed to quantitatively interpret the dynamic hydrogeosystems such as the seasonal groundwater storage, slow-moving landslide channel flux, their geometric and mechanical variabilities. 

　　  中国科学院地理科学与资源研究所 

　　                                                                                                                           陆地水循环及地表过程院重点实验室 

　　                                                                                                                                    2020年12月14日