基于旋转模型的青藏高原重力变化研究
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摘要
青藏高原地区在大地构造上属于青藏、新疆和华北三大亚板块交界地带,是新构造时期以来最为活跃的一个区域。因其构造运动和地震活动之强烈、地学研究和减灾意义之重要而倍受地学界关注。多年的研究资料表明该区域绕青藏高原东构造存在顺时针旋转运动。卫星重力作为研究地壳运动和变形引起的重力场时空变化的一种新的理论和方法,将其运用到青藏高原区域重力变化研究中去具有新的意义。
结合国内外相关的研究成果,本文的主要内容如下：
1、首先简要介绍了卫星重力探测技术的发展现状及相关研究,以及利用GRACE卫星数据反演地球重力场的成果。在理解应用GRACE卫星数据计算区域重力场原理的基础上,对重力场模型的精度、勒让德函数以及高斯平滑等方面做了相关研究。
2、利用直立长方体重力异常计算理论,推导了直立长方体重力异常旋转计算模型。并根据该模型对单个块体在发生旋转运动后引起的重力异常变化的进行了数值模拟,并分析了块体在发生旋转后,重力异常变化的一些特征。然后,对模型做了进一步推广。
3、结合青藏高原地区的地质构造背景以及主要的构造运动特征的资料,利用直立长方体旋转模型,联合已有的GPS观测资料,模拟计算了青藏高原区域在多板块作用下绕青藏高原东构造旋转运动过程引起的地球外部重力场变化的分布,对其进行了较细致的分析,并结合地质资料将其与前人的研究结果进行了对比,研究了该区域重力场变化特征,以及造成这两种计算结果差异的因素。
In tectonics, Tsinghai-Tibet Plateau is in the junction of Tsinghai-Tibet, Xinjiang and North China subplates, it is the most active area since the new construction period. The tectonic movement and seismic activity are strong here, it is also an important place to geography study and disaster reduction, so Geologists pay much attention to the region. Research information for many years shows this region's clockwise rotation around Tsinghai-Tibet Plateau east structural exists. Satellite gravity survey is a new theory and method to study the spatial and temporal changes in gravity field caused by crustal movement and deformation, and if we apply this into the variation features of gravity field in this region, it will have new significance.
With the researches at home and abroad, the main content of this paper is:
1. First, the paper makes a brief introduction of the development status and the researches of satellite gravity detection technology, and the results of the inversion in Earth's gravity field with GRACE data. After understanding the principle of calculating the regional gravity field with GRACE data, the paper does some relevant researches of gravity model's accuracy, Legendre Function and Gaussian smooth etc.
2. In the paper, we derive rectangular vertical gravity anomaly rotation model with vertical rectangular gravity anomaly theory. According to the model, we simulate the gravity field changes of a single block's gravity anomalies after Rotation, and analyze the characteristics of gravity anomalies after the block's rotation. Then we do further promotion of the model.
3. In this paper, with the materials of geological background and major characteristics of tectonic movement about Tsinghai-Tibet Plateau, using the model and combining GPS data, we simulate the changes in Earth's gravity field's distribution caused by the region's rotation around Tsinghai-Tibet Plateau east structural, and meticulously analyze the distributions. Compared with the previous studies combined geological data, we do some researches of the variation of gravity field and the reasons of the two results' differences.
结合国内外相关的研究成果,本文的主要内容如下：
1、首先简要介绍了卫星重力探测技术的发展现状及相关研究,以及利用GRACE卫星数据反演地球重力场的成果。在理解应用GRACE卫星数据计算区域重力场原理的基础上,对重力场模型的精度、勒让德函数以及高斯平滑等方面做了相关研究。
2、利用直立长方体重力异常计算理论,推导了直立长方体重力异常旋转计算模型。并根据该模型对单个块体在发生旋转运动后引起的重力异常变化的进行了数值模拟,并分析了块体在发生旋转后,重力异常变化的一些特征。然后,对模型做了进一步推广。
3、结合青藏高原地区的地质构造背景以及主要的构造运动特征的资料,利用直立长方体旋转模型,联合已有的GPS观测资料,模拟计算了青藏高原区域在多板块作用下绕青藏高原东构造旋转运动过程引起的地球外部重力场变化的分布,对其进行了较细致的分析,并结合地质资料将其与前人的研究结果进行了对比,研究了该区域重力场变化特征,以及造成这两种计算结果差异的因素。
In tectonics, Tsinghai-Tibet Plateau is in the junction of Tsinghai-Tibet, Xinjiang and North China subplates, it is the most active area since the new construction period. The tectonic movement and seismic activity are strong here, it is also an important place to geography study and disaster reduction, so Geologists pay much attention to the region. Research information for many years shows this region's clockwise rotation around Tsinghai-Tibet Plateau east structural exists. Satellite gravity survey is a new theory and method to study the spatial and temporal changes in gravity field caused by crustal movement and deformation, and if we apply this into the variation features of gravity field in this region, it will have new significance.
With the researches at home and abroad, the main content of this paper is:
1. First, the paper makes a brief introduction of the development status and the researches of satellite gravity detection technology, and the results of the inversion in Earth's gravity field with GRACE data. After understanding the principle of calculating the regional gravity field with GRACE data, the paper does some relevant researches of gravity model's accuracy, Legendre Function and Gaussian smooth etc.
2. In the paper, we derive rectangular vertical gravity anomaly rotation model with vertical rectangular gravity anomaly theory. According to the model, we simulate the gravity field changes of a single block's gravity anomalies after Rotation, and analyze the characteristics of gravity anomalies after the block's rotation. Then we do further promotion of the model.
3. In this paper, with the materials of geological background and major characteristics of tectonic movement about Tsinghai-Tibet Plateau, using the model and combining GPS data, we simulate the changes in Earth's gravity field's distribution caused by the region's rotation around Tsinghai-Tibet Plateau east structural, and meticulously analyze the distributions. Compared with the previous studies combined geological data, we do some researches of the variation of gravity field and the reasons of the two results' differences.
引文
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[15]周旭华,许厚泽.用GRACE卫星跟踪数据反演地球重力场[J].地球物理学报,2006,49(3)：718-723.
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