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- 2016
基于GNSS观测网络的断层滑移时空反演
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Abstract:
利用GNSS网络位移时空序列，基于弹性位错理论，构建了断层滑移时空分布的动态卡尔曼滤波反演模型。考虑断层面的非均匀滑动，将断层面细分为多个子断层，获取了较精细的滑移空间分布，并顾及了先验信息和拉普拉斯平滑约束。鉴于断层滑移引起的地表形变具有高空间相关性的特点，利用整个GNSS观测网络数据一起参与反演，有效分离了空间不相关的噪声。实验结果表明，当断层形变位移量和噪声水平相当，且点位分布间隔沿走向和倾向至少与子断层长宽等同时，均能反演得到正确的断层滑移时空分布。若信噪比不变，测站分布密度继续增大时，对反演效果提高并不显著，但能够容忍较低信噪比的观测数据
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