南海地区岩石圈有效弹性厚度估计  

Estimation of the Effective Elastic Thickness of the Lithosphere in the South China Sea

作　　者：龚正 李志刚 胡立天 熊建国 孙闯 GONG Zheng;LI Zhigang;HU Litian;XIONG Jianguo;SUN Chuang(Guangdong Provincial Key Laboratory of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,135 West-Xingang Road,Guangzhou 510275,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),1 Gangwan,Zhuhai 519080,China;State Key Laboratory of Earthquake Dynamics,Institute of Geology,CEA,A1 Huayanli,Beijing 100029,China)

机构地区：[1]中山大学地球科学与工程学院广东省地球动力作用与地质灾害重点实验室,广州市510275 [2]南方海洋科学与工程广东省实验室(珠海),广东省珠海市519080 [3]中国地震局地质研究所地震动力学国家重点实验室,北京市100029

出　　处：《大地测量与地球动力学》2021年第6期572-576,共5页Journal of Geodesy and Geodynamics

基　　金：广东省引进人才创新创业团队-环南海地质过程与灾害创新团队(2016ZT06N331);国家重点研发计划(2017YFC1500101);广东省自然科学基金(2018A030310314)。

摘　　要：分析了测高卫星同时应用于重力模型和地形模型时对计算南海地区岩石圈有效弹性厚度的影响,该影响可能会高估有效弹性厚度值。对比多项研究认为,南沙群岛地区岩石圈的有效弹性厚度约为9 km。通过对南海地区岩石圈的有效弹性厚度分布进行计算发现,南海海盆的有效弹性厚度最小约为4 km,南海周边的有效弹性厚度值较高,与海底岩石圈年龄的空间分布有较强的相关性,符合南海海盆扩张的历史。We analyze the effect of altimetry satellites applied to the gravity and terrain models simultaneously on the calculation of effective elastic thickness in the South China Sea.This effect may overestimate the effective elastic thickness.Comparing multiple studies,we infer that the effective elastic thickness in the Nansha islands is 9 km.By calculating the effective elastic thickness distribution in the South China Sea,we find that the minimum effective elastic thickness of the South China Sea basin is about 4 km,and the effective elastic thickness around the South China Sea is relatively high,with strong correlation to the spatial distribution of the age of the submarine lithosphere.It also conforms to the history of the expansion of the South China Sea basin.

关 键 词：岩石圈有效弹性厚度 南中国海 测高卫星资料 频谱分析 

分 类 号：P223[天文地球—大地测量学与测量工程] P313[天文地球—测绘科学与技术]