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前兆定点形变观测数据噪声分析
The Noise Analysis of Fixed deformation station Time Series
- DOI:
- 作者:
- 刘俊清1,2） 丁广1） 张晨侠1） 王雨萌1）
- 作者单位:
- 1) 吉林省地震局,吉林 长春 130117 2) 吉林大学•地球探测科学与技术学院，吉林 长春 130026）
- 关键词:
- 定点形变；噪声；功率普密度；最大似然估计；谱指数
Fixed deformation station；Noise；Power spectrum density；MLE；Spectrum index
- 摘要:
-
地球物理研究表明，可以构造或选择合适的统计模型模拟观测噪声，从而了解噪声特性并且获得噪声谱及其含量。通过对吉林省5个台站的倾斜观测共18个测项产出的时间序列进行噪声分析。结果表明，长期观测噪声可用带通噪声和随机游走噪声的组合模型模拟，短时间观测噪声可用谱指数介于-1至-2之间的幂律噪声模型模拟。该结论对定点形变观测噪声的认识、噪声源的研究以及地壳构造信息的提取具有参考意义。
In the study about earthquake deformation monitoring, deformation time series contains many kinds of noise. Geophysical observations suggest that the measurement noise can be simulated by constructing or looking for the optimisticest statistical model,and got the noise characteristics by noise spectrum and its content.In this paper, the noise of 18 deformation monitoring time series from 5 ground tilt Fixed deformation stations were studied and process,The conclusion show that the noise of a long-term time series can be simulated by a combination of band-pass noise plus random walk noise model,and the short time one can be better modeled using power law noise with a spectral index between 1 and 2. The conclusion of the noise of fixed point deformation data will have a great significance to noise characteristics’ recognising, noise source’s researching and extracting crustal tectonic information.
