| 汶川地震前后四川区域GPS时序特征演变及统计分析 |
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| 引用本文： | 廖华,徐锐,陈维锋,陈聪,顾铁.汶川地震前后四川区域GPS时序特征演变及统计分析[J].地球物理学报,2013,56(4):1237-1245. |
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| 作者姓名： | 廖华 徐锐 陈维锋 陈聪 顾铁 |
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| 作者单位： | 四川省地震局减灾救助研究所,成都 610041 |
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| 摘 要： | 为探索地震事件对GPS坐标时间序列的长周期影响,对汶川地震前后四川GPS观测网络长约10年的解算成果进行了多参数模型噪声特征分析.基于最大似然估计方法和频谱特性分析,提取了地震前后各测站坐标序列中的噪声分量,使用Λ-统计检验,得出"白噪声+闪烁噪声"模型可以作为四川GPS区域观测网络的最优噪声组合模型,同时,地震事件使得地震前后GPS噪声分量中的白噪声、闪烁噪声、随机游走噪声等发生显著改变,说明传统谱噪声分析中简单地将地震数据拼接在一起并进行统一处理的模式并不可取;使用共模误差分析方法、区域速度场变化趋势等信息对地震前后噪声模型的改变成因进行了初步的物理解析.
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| 关 键 词： | 汶川地震 噪声分量 最大似然估计 幂律噪声 统计分析 |
| 收稿时间： | 2012-07-16 |
Propertyvariation and statistical analysis of Sichuan GPS time series before and after Wenchuan Earthquake |
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| LIAO Hua
,
XU Rui
,
CHEN Wei-Feng
,
CHEN Cong
,
GU Tie.Propertyvariation and statistical analysis of Sichuan GPS time series before and after Wenchuan Earthquake[J].Chinese Journal of Geophysics,2013,56(4):1237-1245. |
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| Authors: | LIAO Hua XU Rui CHEN Wei-Feng CHEN Cong GU Tie |
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| Institution: | Disaster Relief Research Institute, Sichuan Provincial Earthquake Bureau, Chengdu 610041, China |
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| Abstract: | In order to explore the long-term influence of seismic event on the GPS time series,10yr long processing results from Sichuan GPS network were used for the multi-parameter noise model analysis. Based on the Maximum Likelihood Estimator method and spectrum analysis, the noise components in the station coordinate time series were extracted, and through Λ-statistic test, we found 'white noise+flicker noise' is the best combination that can best fit the Sichuan local area network, meanwhile, an apparent variation in the noise component of GPS, including white noise, flicker noise, and random walk noise, occurred before and after the seismic event, which demonstrates that the traditional processing mode which simply splice and resolve the preseismic and postseismi data together is unacceptable. The common mode error analytical method and velocity variation information were all used for the initial physical interpretation of such apparent noise component change. |
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| Keywords: | Wenchuan earthquake Noise component MLE Power law noise Statistical analysis |
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