|本期目录/Table of Contents|

[1]梁晨昊,申重阳,王嘉沛.基于直立长方体模型的山体隆升与重力变化关系数值模拟[J].地震研究,2021,(02):162-169.
 LIANG Chenhao,SHEN Chongyang,WANG Jiapei.Simulation of the Relationship between the Surface Deformation and the Gravity Variation Based on Vertical Cuboid[J].Journal of Seismological Research,2021,(02):162-169.
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基于直立长方体模型的山体隆升与重力变化关系数值模拟(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
期数:
2021年02期
页码:
162-169
栏目:
出版日期:
2021-06-30

文章信息/Info

Title:
Simulation of the Relationship between the Surface Deformation and the Gravity Variation Based on Vertical Cuboid
作者:
梁晨昊申重阳王嘉沛
(中国地震局地震研究所 地震大地测量重点实验室,湖北 武汉430071)
Author(s):
LIANG ChenhaoSHEN ChongyangWANG Jiapei
(Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration,Wuhan 430071,China)
关键词:
耦合运动 地表形变 重力变化 重力垂直梯度
Keywords:
coupled motion surface deformation gravity variation vertical gravity gradient
分类号:
P315.721
DOI:
-
摘要:
基于形变与密度变化耦合运动理论,利用时变场内重力垂直梯度的计算方法,采用直立长方体模型,根据青藏高原平均降升速率,模拟计算在艾黎地壳均衡模式下,地表形变所引起重力及其垂直梯度的变化。结果显示,在山体抬升过程中,伴随着地表的隆升,重力值亦逐渐减小,导致其减小的原因为介质体密度减小与测点的高度增加。伴随着山体最高点抬升了5 cm,在最高点处重力变化为-14 μGal,对应的重力梯度约为-2.6 E。重力垂直梯度与静态场重力梯度存在一定的差异,其原因为在重力梯度场中加入了时间效应。
Abstract:
Based on the coupling theory of deformation and density variation,the vertical gradient of gravity in time-varying field is calculated.By the help of the vertical cuboid and average uplift rate of the Tibetan plateau,the process of the mountain movement is simulated,and the variation of gravity and its vertical gradient caused by surface deformation is simulated in accordance with the Airy equilibrium model.The results show that in the process of mountain uplift,the gravity value gradually decreases.It is speculated that the gravity decrease is caused by the decrease of medium density and the increase of the height of the measuring point.The mountaintop where the maximum gravity value appears rises for 5 cm,as a result,the maximum gravity changes for-14 μGal,and the corresponding gravity gradient is about -2.6 E.Due to the time effect in the gravity gradient field,there is a certain difference between the vertical gravity gradient and the static gravity gradient.

参考文献/References:

陈运泰,顾浩鼎,卢造勋.1980.1975年海城地震与1976年唐山地震前后的重力变化[J].地震学报,2(1):21-30.
段虎荣,康明哲,吴绍宇,等.2020.利用 GRACE时变重力场反演青藏高原的隆升速率[J].地球物理学报,63(12):4345-4360.
李强,游新兆,杨少敏,等.2012.中国大陆构造变形高精度大密度GPS监测——现今速度场[J].中国科学:地球科学,42(5):629-632.
李瑞浩.1988.重力学引论[M].北京:地震出版社.
申重阳.2005.地壳形变与密度变化耦合运动探析[J].大地测量与地球动力学,25(3):11-16.
申重阳,李辉.2007.研究现今地壳运动和强震机理的一种方法[J].地球物理学进展,22(1):49-56.
王嘉沛.2015.地壳变形与密度变化耦合运动引起的重力变化效应研究[D].北京:中国地震局地震研究所.
王嘉沛,申重阳,玄松柏.2015.全球地壳模型CRUST1.0在青藏高原东南部的重力检核[J].大地测量与地球动力学,35(4):621-626.
邢乐林,王林海,胡敏章,等.2017.时变重力测量确定青藏高原地壳隆升与增厚速率[J].武汉大学学报(信息科学版),42(5):569-574.
Reilly W I,Hunt T M.1976.Comment on An analysis of local changes in gravity due to deformation by J B Walsh[J].Pure & Applied Geophysics,114(6):1131-1133.
Walsh J B.1975.An analysis of local changes in gravity due to deformation[J].Pure & Applied Geophysics,113(1):97-106.

备注/Memo

备注/Memo:
收稿日期:2020-12-25
基金项目:国家自然科学基金项目(41674018)资助.
更新日期/Last Update: 2021-06-30