中国南海重力梯度多尺度分析Multi-scale analysis of gravity gradients in South China Sea
黎晋博,许闯,简光煜,余杭涛,曾文锐,鄢建国
摘要(Abstract)：
针对鲜有学者利用沿轨重力梯度数据研究中国南海地下结构的问题,该文采用小波多尺度分析方法和功率谱估计方法对该地区重力梯度数据进行处理,以获取不同深度结构特征。该方法从重力梯度数据中有效提取出不同深度场源所产生的重力信号,提升了重力梯度数据的垂向识别能力,可以给出地下介质在不同深度的分布状况。研究结果表明:浅层场源所产生的重力梯度在区域中部和东南角分布密集,呈现正负异常交替出现的链状分布特征;在平均深度约31 km处的地下存在一个被高密度体所包围的大型低密度体;45 km以下的深层区域,未有明显异常体显示,密度分布总体上沿西北-东南方向逐渐增大。
关键词(KeyWords)： 重力梯度;中国南海;小波多尺度分析
基金项目(Foundation): 国家自然科学基金项目(41974014);; 武汉大学测绘遥感信息工程国家重点实验室开放基金项目(19P01)
作者(Author): 黎晋博,许闯,简光煜,余杭涛,曾文锐,鄢建国
DOI: 10.16251/j.cnki.1009-2307.2020.11.001
参考文献(References)：
- [1] 罗新刚,王万银,张功成,等.基于重力资料的南海及领区断裂分布特征研究[J].地球物理学报,2018,61(10):4255-4268.(LUO Xingang,WANG Wanyin,ZHANG Gongcheng,et al.Study on distribution features of faults based on gravity data in the South China Sea and its adjacent areas[J].Chinese J.Geophys,2018,61(10):4255-4268.)
- [2] 张功成,王良书,唐显春,等.试论南中国海盆地新生代板块构造及盆地动力学[J].地质科学,2011,46(3):638-652.(ZHANG Gongcheng,WANG Liangshu,TANG Xianchun,et al.On the cenozonic tectonics and basin dynamics of the South China Sea[J].Chinese Journal of Geology,46(3):638-652.)
- [3] 徐行,姚永坚,彭登,等.南海西南次海盆的地热流特征与分析[J].地球物理学报,2018,61(7):2915-2925.(XU Xing,YAO Yongjian,PENG Deng,et al.The characteristics and analysis of heat flow in the Southwest sub-basin of South China Sea[J].Chinese Journal of Geophysics,2018,61(7):2915-2925.)
- [4] 尹延鸿,温珍河,孙桂华,等.中国南部海域主要断裂类型、分布及地质特征[J].海洋地质前沿,2013,29(8):1-6.(YIN Yanhong,WEN Zhenhe,SUN Guihua,et al.Types,distribution and geological feature of the main faults in the southern China seas[J].Marine Geology Frontiers,2013,29(8):1-6.)
- [5] 梁勇,朱广彬,刘洪涛,等.卫星重力梯度数据确定地球重力场的正则化方法研究[J].地球物理学进展,2019(4):1-9.(LIANG Yong,ZHU Guangbin,LIU Hongtao,et al.Regularization of the earth gravity field determination using satellite gravity gradiometry data[J].Progress in Geophysics,2019(4):1-9.)
- [6] 胡宁.东昆仑三维重力异常解释方法研究[J].青海地质,1996(2):33-42.(HU Ning.Research on the interpretative methods of 3D gravity anomalies in the eastern Kunlun[J].Qinghai Geology,1996(2):33-42.)
- [7] 侯遵泽,杨文采.中国重力异常的小波变换与多尺度分析[J].地球物理学报,1997(1):85-95.(HOU Zunze,YANG Wencai.Wavelet transform and multi-scale analysis on gravity anomalies of China[J].Acta Geophysica Sinica,1997(1):85-95.)
- [8] SPECTOR A,GRANT F S.Statistical models for interpreting aeromagnetic data[J].Geophysics,1970,35:293-302.
- [9] 苏勇.利用GOCE和GRACE卫星数据确定全球重力场模型[D].成都:西南交通大学,2016.(SU Yong.The Earth’s gravitational field model determined by GOCE and GRACE data[D].Chengdu:Southwest Jiaotong University,2016.)
- [10] ESA.GUT user guide and algorithm descriptions[J].ESA-GUT-AD-001,2009,2:1-112.
- [11] 刘晓刚.GOCE卫星测量恢复地球重力场模型的理论与方法[D].郑州:信息工程大学,2011.(LIU Xiaogang.Theory and methods of the Earth’s gravity field model recovery from GOCE data[D].Zhengzhou:Information Engineering University,2011.)
- [12] 周波阳,罗志才,许闯,等.航空重力数据向下延拓的FFT快速算法比较[J].大地测量与地球动力学,2013,33(1):64-68.(ZHOU Boyang,LUO Zhicai,XU Chuang,et al.Comparison among fast Fourier transform algorithms for downward continuation of airborne gravity data[J].Journal of Geodesy and Geodynamics,2013,33(1):64-68.)
- [13] 郭俊义.物理大地测量学基础[M].武汉:武汉测绘科技大学出版社,1994.(GUO Junyi.Foundation of physical geodesy[M].Wuhan:Press of Wuhan University of Surveying and Mapping,1994.)
- [14] 李振海,汪海洪.重力数据网格化方法比较[J].大地测量与地球动力学,2010,30(1):140-144.(LI Zhenhai,WANG Haihong.Comparison among methods for gravity data gridding[J].Journal of Geodesy and Geodynamics,2010,30(1):140-144.)
- [15] 钟波.基于GOCE卫星重力测量技术确定地球重力场的研究[D].武汉:武汉大学,2010.(ZHONG Bo.Study on the determination of the Earth’s gravity field from satellite gravimetry mission GOCE[D].Wuhan:Wuhan University,2010.)
- [16] 罗志才,宁津生.卫星重力梯度向下延拓的谱方法[J].测绘学报,1997,26(2):168-175.(LUO Zhicai,NING Jinsheng.Spectral method for the downward continuation of satellite gravity gradiometry data[J].Acta Geodaetica et Cartographica Sinica,1997,26(2):168-175.)
- [17] 蒋涛.利用航空重力测量数据确定区域大地水准面[J].测绘学报,2013,42(1):152.(JIANG Tao.Regional geoid determination using airborne gravimetry data[J].Acta Geodaetica et Cartographica Sinica,2013,42(1):152.)
- [18] MALLAT S.A theory for multiresolution signal decomposition:the wavelet representation[J].IEEE Trans.Pattern Anal.Mach.Intell.,1989,11:674-693.
- [19] 许闯.多尺度重力反演方法及其在城市活动断层探测中的应用研究[D].武汉:武汉大学,2014.(XU Chuang.Study on multi-scale gravity inverse method and its application to detect urban active faults[D].Wuhan:Wuhan University,2014.)
- [20] XU C,LUO Z,SUN R,et al.Multilayer densities using a wavelet-based gravity method and their tectonic implications beneath the Tibetan Plateau[J].Geophys.J.Int,2018,213:2085-2095.