摘要
以祁连-河西地区20世纪90年代以来的地震重力网重复观测资料为依据,借助由重力场模型求解大地水准面差距的Bruns公式和Stokes积分的近似解,计算了该区不同时间尺度的局部大地水准面变化,研究了局部大地水准面变化及其与地质构造和地震活动的关系。结果显示:祁连-河西地区局部大地水准面变化空间总体形态具有分区性,且不同时间段演化呈现非平稳性;几次6级左右地震前资料显示,局部大地水准面细部变异与地震位置有关。
On the basis of the repeated observational data of seismic gravity network since 1990s in Qilianshan- Hexi area, the changes of local geoid in different time scale are calculated with Bruns formula and approximately solution of Stokes＇ integral those are usually used for getting the difference of geoid from gravity field model. The variation of local geoid and the relation to geologic tectonic and seismicity are researched. The conclusions are that the general shape of local geoid variation in Qilianshan-Hexi area has divisional property, and the evolvement of local geoid for different periods is nonstationary. The detail variation of local geoid is related to the position of earthquakes from the data before several Ms6.0 earthquakes.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第1期6-10,56,共6页
Journal of Geodesy and Geodynamics
基金
地震科学联合基金(A08060)
关键词
祁连山-河西
重力复测
局部大地水准面
分区性变化
地震预测
Qilianshan-Hexi area
repeated gravity observation
local geoid
subarea variety
seismic forecasting
