基于2008年CHAMP卫星地磁总强度数据分析中国及邻区地磁异常特征  

Analysis of the Magnetic Anomalies in China and its Adjacent Areas from the CHAMP Satellite Geomagnetic Total Intensity Data in 2008

作　　者：王粲[1,2] 袁洁浩 王振东[1] WANG Call YUANG Jiehao WANG Zhendong(Institute of Geophysics, China Eearthquake Administration, Beijing 100081, China USGS,Menlo park, CA 94025, USA)

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]USGS

出　　处：《地震研究》2017年第3期399-403,共5页Journal of Seismological Research

基　　金：2015年度地震行业科研专项--2015.0年代中国地磁参考场编制(201508013);中国综合地球物理场观测--大华北地区(201508009)联合资助

摘　　要：CHAMP卫星10年的观测任务提供了大量高精度的地磁观测数据。利用2008年CHAMP卫星地磁总强度F观测数据,通过地磁指数及地方时阈值为参数选取地磁活动较为平静期间的卫星观测资料,并利用地磁参考模型去除主磁场和外源场成分,获得了中国及邻区地磁异常分布。结果表明:卫星磁异常的分布特征与地质构造有较好的对应关系,塔里木盆地、四川盆地、松辽盆地、印度地台及华北平原部分地区表现为正磁异常,青藏高原和阿尔泰造山带地区表现为负磁异常。The CHAMP satellite mission provided reliable measurements for both global and regional lltlaosplaenc mag- netic fields. Based on the CHAMP satellite scalar magnetic field data in 2008, we derived the scalar magnetic a- nomalies in China and its adjacent areas. In order to extract the lithospheric magnetic anomalies, satellite magnetic data was selected to obtain the least - disturbed data, and we chose the satellite observation data through quiet pe- riod of magnetic activity based on the magnetic index and local threshold. Then the main magnetic field, magneto- spheric field, ionospheric field and induction fields were corrected, and some unrealistic observed data were dele- ted. The CHAMP magnetic anomalies showed good relationship with the lithospheric structure in China and adja- cent areas, the high positive magnetic anomalies are mainly located at the old platform and huge basin areas, such as the Songliao basin, Sichuan basin and Tarim basin ,while the negative anomalies located in fold zones, such as Tibet plateau and Altai orogenic belt.

关 键 词：岩石圈磁场 CHAMP卫星 地磁总强度:卫星磁异常 地质构造 

分 类 号：P318[天文地球—固体地球物理学]