起伏地形条件下流动重力数据处理方法研究
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摘要
以地震监测为目的流动重力重复测量获取的重力年变信号通常在十几到几十微伽量级。但由于重力测点所处的地形高程不同,将空间测点直接插值得到的重力异常空间图像会叠加由于地形起伏引起的异常畸变。本文通过6面体模型定量计算了不同规模和埋深场源的地形效应;对青藏高原东缘地区测网的重力观测数据进行了分析处理,并通过位场曲面延拓校正技术消除了地形影响。结果表明,位场曲面延拓校正技术可以有效地改善重力数据质量,有利于更准确地圈定和认识异常的空间形态特征。
The annual gravity variation in the same measuring position, which is for seismic monitoring by repeated measurement, is about more than a few tens 1×10-8m·s-2. However, since the topography of the measuring position is varying from point to point, the gravity anomaly gained through gridding will be influenced directly. So we calculated the topographic effects with different scales and depth of field sources by the hexahedral model in this paper, and with this as the basis, we analyzed the gravity observation data of the eastern margin of Qinghai-Tibetan plateau, and removed the influence of the terrain by the method of potential field continuation. The results showed that this method was efficient in improving the quality of the gravity data, which was more helpful in cognizing the space characteristics of gravity anomaly and also the gravity field variation by repeated measurements.
The annual gravity variation in the same measuring position, which is for seismic monitoring by repeated measurement, is about more than a few tens 1×10-8m·s-2. However, since the topography of the measuring position is varying from point to point, the gravity anomaly gained through gridding will be influenced directly. So we calculated the topographic effects with different scales and depth of field sources by the hexahedral model in this paper, and with this as the basis, we analyzed the gravity observation data of the eastern margin of Qinghai-Tibetan plateau, and removed the influence of the terrain by the method of potential field continuation. The results showed that this method was efficient in improving the quality of the gravity data, which was more helpful in cognizing the space characteristics of gravity anomaly and also the gravity field variation by repeated measurements.
引文
陈石、王谦身、祝意青等,2011,青藏高原东缘重力导纳模型均衡异常时空特征,地球物理学报,54(1),22～34。
陈运泰、顾浩鼎、卢造勋,1980,1975年海城地震和1976年唐山地震前后的重力变化,地震学报,2(1),21～31。
顾功叙、郭宗汾、刘克人等,1997,中国京津唐张地区时间上连续的重力变化与地震的孕育和发生,科学通报,42(18),1920～1930。
侯重初、蔡宗熹、刘奎俊,1985,从偶层位出发建立曲面上的位场转换解释系统,地球物理学报,28(4),410～418。
刘金兰、王万银、于长春,2007,逐步逼近曲化平方法研究,地球物理学报,50(5),1551～1557。
卢红艳、郑金涵、刘端法等,2004,1985～2003京津唐张地区重力变化,地球物理学进展,19(4),887～892。
马杏垣,1989,重力作用与构造运动,北京:地震出版社。
申重阳、李辉、孙少安,2009,重力场动态变化与汶川M8.0地震孕育过程,地球物理学报,52(10),2547～2557。
王万银、刘金兰、邱之云等,2009,频率域偶层位曲面位场处理和转换方法研究,地球物理学报,52(10),2652～2665。
王万银、潘作枢,1996,偶层位曲面位场数据处理及转换方法,西安地质学院学报,18(3),69～76。
祝意青、梁伟锋、湛飞并等,2012,中国大陆重力场动态变化研究,地球物理学报,55(3),804～813。
祝意青、徐云马、吕弋培等,2009,龙门山断裂带重力变化与汶川8.0级地震关系研究,地球物理学报,52(10),2538～2546。
陈运泰、顾浩鼎、卢造勋,1980,1975年海城地震和1976年唐山地震前后的重力变化,地震学报,2(1),21～31。
顾功叙、郭宗汾、刘克人等,1997,中国京津唐张地区时间上连续的重力变化与地震的孕育和发生,科学通报,42(18),1920～1930。
侯重初、蔡宗熹、刘奎俊,1985,从偶层位出发建立曲面上的位场转换解释系统,地球物理学报,28(4),410～418。
刘金兰、王万银、于长春,2007,逐步逼近曲化平方法研究,地球物理学报,50(5),1551～1557。
卢红艳、郑金涵、刘端法等,2004,1985～2003京津唐张地区重力变化,地球物理学进展,19(4),887～892。
马杏垣,1989,重力作用与构造运动,北京:地震出版社。
申重阳、李辉、孙少安,2009,重力场动态变化与汶川M8.0地震孕育过程,地球物理学报,52(10),2547～2557。
王万银、刘金兰、邱之云等,2009,频率域偶层位曲面位场处理和转换方法研究,地球物理学报,52(10),2652～2665。
王万银、潘作枢,1996,偶层位曲面位场数据处理及转换方法,西安地质学院学报,18(3),69～76。
祝意青、梁伟锋、湛飞并等,2012,中国大陆重力场动态变化研究,地球物理学报,55(3),804～813。
祝意青、徐云马、吕弋培等,2009,龙门山断裂带重力变化与汶川8.0级地震关系研究,地球物理学报,52(10),2538～2546。
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