基于Sentinel-1雷达影像的成都市地面沉降InSAR监测分析

利用2017-03~2018-03共30景Sentinel-1A SAR数据,分别采用PSI和SBAS技术获取成都市主城区地面形变分布信息,结合地面水准资料对InSAR结果进行精度评估,并初步分析地面沉降的原因。结果表明,成都市大部分区域稳定,平均形变速率主要集中在-5~5 mm/a;地面沉降主要位于一环线以外地区,地铁5、6号线主要站点及周边不均匀沉降明显,最大沉降速率达到20 mm/a;在成华区和锦江区等部分新建城区有不同程度的地面沉降,速率为5~15 mm/a,PSI和SBAS结果相关性较高。     

杭州湾沿海地区地面沉降时序InSAR监测与分析

Time-series InSAR analysis(e.g., permanent scatterers(PSInSAR)) has been proven as an effective technology in monitoring ground deformation over urban areas. However, it is a big challenge to apply this technology in coastal regions due to the lack of man-made targets. An distributed scatterers interferometric synthetic aperture radar(DSInSAR) is developed to solve the problem of insufficient samples and low reliability in monitoring coastal lowland subsidence, by applying a spatially adaptive filter and an eigendecomposition algorithm to estimating the optimal phase of statistically homogeneous distributed scatterers(DSs). Twenty-four scenes of COSMO-Sky Med images acquired between 2013 and 2015 are used to retrieve the land subsidence over the Shangyu District on south coast of the Hangzhou Bay, Zhejiang Province, China. The spatial pattern of the land subsidence obtained by the PS-InSAR and the DSInSAR coincides with each other, but the density of the DSs is three point five times higher than the permanent scatterers(PSs). Validated by precise levelling data over the same period, the DSInSAR method achieves an accuracy of ±5.0 mm/a which is superior to the PS-InSAR with±5.5 mm/a. The land subsidence in the Shangyu District is mainly distributed in the urban areas, industrial towns and land reclamation zones, with a maximum subsidence rate –30.2 mm/a. The analysis of geological data, field investigation and historical reclamation data indicates that human activities and natural compaction of reclamation material are major causes of the detected land subsidence. The results demonstrate that the DSInSAR method has a great potential in monitoring the coastal lowland subsidence and can be used to further investigate subsidence-related environmental issues in coastal regions.     

芬兰更新航空物探设备

由于以往使用的DC 3型飞机零件补充困难,耗油量大,同时仪器性能、重量和可靠性在七十年代均有很大进展,所以芬兰于1979～1980年开始设计新的仪器,安装在DHC.6 Twin Otter,STOL飞机内,并成功地做了一个野外     

岩石中氟化物的分析及其在地质找矿上的应用

引言虽然地质及地球化学工作者对形成岩浆-热液矿床的组份(如硫、氯、水)的重要性日益感到兴趣,但对除氯以外的其它卤素却注意不够.卤素中氟是最丰富的,除可能参与某些热液过程以外,它是为数不多的地球化学直接找矿中一种有价值的元素.直到现在,地质样品的氟化物"都是在手续烦琐的蒸馏分离以后用滴定法和分光光度法分析.大约在六年前氟化物离子选择电极问世以后,发表了     

粒玄岩岩脉的磁异常和古地磁学研究

前言很多人相信在印度安得拉邦卡林钠加尔县有大量含铁石英岩.为了证实这里及附近外围到底有无这类岩石,在此县200平方英里范围内进行了地质调查和地球物理探测.结果只是在三个村庄(基斯塔拉奥巴里、马克达姆普尔和曼贾姆巴里)发现了规模不大的含铁石英岩囊状体,并排除了它们在地下有延伸的可能性.根据磁异常走向,认为地下有粒玄岩岩脉,错误地把粒玄岩当作了含     

在南威尔士用磁法填图找赤铁矿

南威尔士和坎伯兰以前都曾经用磁法寻找过赤铁矿.通常是沿选定的直线测线测量磁场垂直分量的变化.对测量结果只对磁场日变进行改正.这样得到的成果一般是得不到要领的.也发现不了大的新矿体.以后采用了新的工作方法,对成果除进行磁场日变改     

中国四大奇石

正东坡肉形石规格:5.73×6.6×5.3cm重量:0.52kg专家估价:无价东坡肉形石出自内蒙阿拉善左旗,在清朝康熙年间供入内府,为中国四大奇石之一,现收藏在台北故宫。此奇石是一块天然的石头,如鸡蛋大小,其矿物化学成分是二氧化硅。此东坡肉形石色泽纹理全是天然形成,看上去完全是一块栩栩如生的五花肉块,"肉"的肥瘦层次分明、肌理清晰、毛孔宛然,肌理也相当逼真,它与翠玉白菜、毛公鼎并称台北故宫的"镇馆三宝"。