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有研究表明从中国北部经黄海、朝鲜半岛、日本海至日本本州岛存在一个大型断裂带,被称为“北纬40°断裂带”.为了验证该断裂带的存在性,本文通过GRACE和CHAMP卫星的位场数据中的大尺度区域重力和磁力异常来研究该区的大型构造特征.区域性研究范围为24°N～56°N,90°E～150°E,详细研究范围为32°N～42°N,122°E～132°E.2008年Taylor等利用CHAMP卫星2005年6月至12月收集的轨道数据,从测量数据中消除地核和外部产生磁场效应,经化磁极之后得到磁异常图,从中来追踪构造特征,并根据地质和地球物理资料建立了数学模型来进行解释.本文在此基础上,增加了GRACE卫星2003年10月份测量的重力异常场数据.实测差分位场数据利用高斯勒让德求积法转换为垂向重力异常值,通过减去最新地球重力场模型(EGM96)的场值来去除波长超过1100km的长波长异常,所得的重力异常数据和磁场数据进行比较.为了能从中得到研究区的共同构造特征,建立一个球面棱柱模型进行正演模拟、并进行重、磁异常场的波数相关性分析.研究发现在重、磁异常中均发现一个呈负相关的纬向构造特征,东亚地区“北纬40°断裂带”横穿了整个朝鲜半岛.
Studies have shown that there is a large fault zone from northern China through the Yellow Sea, the Korean Peninsula, the Sea of Japan to Japan’s Honshu Island, and is called “North 40 ° Fault Zone.” In order to verify the existence of the fault zone, CHAMP satellite data in the large-scale regional gravity and magnetic anomalies to study the large-scale structural characteristics of the region.The regional research range of 24 ° N ~ 56 ° N, 90 ° E ~ 150 ° E, a detailed study of the range of 32 ° N ~ 42 ° N, 122 ° E ~ 132 ° E. In 2008, Taylor et al. Used the orbital data collected by the CHAMP satellite from June to December 2005 to eliminate the magnetic field effect from the measured data and the external magnetic field After that, the magnetic anomaly map is obtained, the tectonic features are traced, and the mathematical model is established according to the geological and geophysical data to explain.This paper adds the data of gravity anomalies measured by GRACE satellite in October 2003. The measured difference The field data are converted to vertical gravity anomalies using the Gauss-Leander quadrature method and the long-wavelength anomalies of wavelengths longer than 1100 km are removed by subtracting the field values of the latest Earth Gravity Field Model (EGM96). The resulting gravity anomalies and magnetic fields Data into In order to obtain the common structural characteristics of the study area, a spherical prism model was established for forward modeling and wave number correlation analysis of heavy and magnetic anomalous fields was carried out. Related zonal structural features, East Asia “40 degrees north latitude fracture zone ” across the entire Korean peninsula.