震前尼泊尔GPS速度场分析Analysis of GPS velocity field before the earthquake in Nepal
闵阳
摘要(Abstract)：
针对多数GPS时间序列分析中未考虑与时间有关的噪声问题,该文利用GAMIT/GLOBK软件对尼泊尔地震前2011—2015年连续观测的GPS数据进行解算,对时间序列进行噪声分析,利用频谱分析法确定噪声模型,最后在考虑噪声特征下,利用时间序列分析软件CATS估算其周期性和站点速度场。结果表明:尼泊尔境内的连续站的最佳噪声模型是"白噪声+闪烁噪声";没考虑时间序列中时间相关的噪声,水平速度场估算误差被低估7~8倍;同时该区域GPS时间序列存在波峰较为一致的周期运动,区域内的水文荷载是造成该现象的主要原因,因此在研究该地区地壳构造运动时,必须考虑水文荷载等非构造运动带来的干扰。
关键词(KeyWords)： 尼泊尔地震;GPS时间序列;噪声分析;周期分析;速度场
基金项目(Foundation):
作者(Author): 闵阳
DOI: 10.16251/j.cnki.1009-2307.2018.08.024
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