Time-varying gravity field model of Sichuan-Yunnan region based on the equivalent mass source model

IF 2.8 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Geodesy and Geodynamics Pub Date : 2023-11-01 DOI:10.1016/j.geog.2023.04.006

Xiaozhen Hou , Shi Chen , Linhai Wang , Jiancheng Han , Dong Ma

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引用次数: 0

Abstract

High-precision time-varying gravity field is an effective way to study the internal mass movement and understanding the spatio-temporal evolution process of the geodynamic system. Compared to the satellite gravity measurement, the repeated terrestrial gravity observation can provide a more high-order signal related to the shallow crust and subsurface. However, the suitable and unified method for gravity model estimation is a key problem for further applications. In this study, we introduce the spherical hexahedron element to simulate the field source mass and forward model the change of gravity field located at the Sichuan-Yunnan region (99–104°E, 23–29°N) in the four epochs from 2015 to 2017. Compared to the experimental results based on Slepian or spherical harmonics frequency domain method, this alternative approach is suitable for constructing the equivalent mass source model of regional-scale gravity data, by introducing the first-order smooth prior condition of gravity time-varying signal to suppress the high-frequency component of the signal. The results can provide a higher spatial resolution reference for regional gravity field modeling in the Sichuan-Yunnan region.

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基于等效质量源模型的川滇地区时变重力场模型

高精度时变重力场是研究岩体内部运动和了解地球动力系统时空演化过程的有效途径。与卫星重力测量相比，地面重复重力观测可以提供与地壳浅层和地下相关的高阶信号。然而，合适的、统一的重力模型估计方法是进一步应用的关键问题。本文采用球面六面体单元模拟了2015 - 2017年4个时期川滇地区(99-104°E, 23-29°N)重力场的变化，并对其进行了正演模拟。与基于Slepian或球谐频域方法的实验结果相比，该方法通过引入重力时变信号的一阶平滑先验条件来抑制信号的高频成分，适合于构建区域尺度重力数据的等效质量源模型。研究结果可为川滇地区区域重力场模拟提供更高的空间分辨率参考。

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来源期刊

Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

4.40

自引率

4.20%

发文量

566

审稿时长

69 days

期刊介绍： Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.