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Analysis of Sacks Body Strain Interference at Beida No.200 Station in Changping and Earthquake Case Study
Li Hangu,Hu Lan,Wu Lijun
作者单位E-mail
Li Hangu Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China  
Hu Lan Shaoyang Seismic Station, Earthquake Administration of Hunan Province, Shaoyang 422000, Hunan, China  
Wu Lijun Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China wulj@cea-ies.ac.cn 
摘要:
The relationship between Sacks body strain deformation at Beida No. 200 station in Changping and tidal solids, atmospheric pressure and water level is analyzed in this paper. Sacks body strain deformation data before the MS8.0 Wenchuan earthquake is studied based on the analysis of the interference. The short-impending anomaly of the body strain deformation is considered to be reliable. The anomaly characteristics conclude:(1) The trend anomaly as extensional change of the body strain deformations on a quasi 1 year time scale before the Wenchuan earthquake was recorded, and the accumulative amount was about 4000×10-9. Correspondingly, the short-term precursor of earthquake was manifested as an extensional abrupt change. (2) The extensional intermittent anomalous abrupt change was recorded by body strainmeters between March 1 and May 7 in 2008. (3) Four compressional abrupt changes were recorded in the intermittent distortions recorded between April 13 and May 11. (4) High frequency components were increased in the distortion process in May 1 to 3, 5, 7, and 9 to 12, caused by slow earthquakes before the Wenchuan earthquake according to wavelet analysis. The abnormal phenomena are summarized and the mechanics discussed in this paper. Strain solid tide distortions in body strain observations, the continuous repeated extensional and compressional abrupt changes accompanying these distortions, and the increase of high frequency components can be regarded as the index of short term and impending earthquake prediction, based on analysis of interference factors such as air pressure and water level.
关键词:  Body strain  The solid tide distortion  Slow earthquake  Short imminent anomalies
DOI:
分类号:
基金项目:This project was funded by the Three-in-One Project of Earthquake Monitoring,Forecasting and Scientific Research of China Earthquake Administration:Statistical Research on Earthquake Cases of Short-impending Anomalies of Sacks Body Strain (154201) and Operation and Maintenance of the Shisanling (Ming Tombs) Seismic Station (40417600105).
Analysis of Sacks Body Strain Interference at Beida No.200 Station in Changping and Earthquake Case Study
Li Hangu,Hu Lan,Wu Lijun
Abstract:
The relationship between Sacks body strain deformation at Beida No. 200 station in Changping and tidal solids, atmospheric pressure and water level is analyzed in this paper. Sacks body strain deformation data before the MS8.0 Wenchuan earthquake is studied based on the analysis of the interference. The short-impending anomaly of the body strain deformation is considered to be reliable. The anomaly characteristics conclude:(1) The trend anomaly as extensional change of the body strain deformations on a quasi 1 year time scale before the Wenchuan earthquake was recorded, and the accumulative amount was about 4000×10-9. Correspondingly, the short-term precursor of earthquake was manifested as an extensional abrupt change. (2) The extensional intermittent anomalous abrupt change was recorded by body strainmeters between March 1 and May 7 in 2008. (3) Four compressional abrupt changes were recorded in the intermittent distortions recorded between April 13 and May 11. (4) High frequency components were increased in the distortion process in May 1 to 3, 5, 7, and 9 to 12, caused by slow earthquakes before the Wenchuan earthquake according to wavelet analysis. The abnormal phenomena are summarized and the mechanics discussed in this paper. Strain solid tide distortions in body strain observations, the continuous repeated extensional and compressional abrupt changes accompanying these distortions, and the increase of high frequency components can be regarded as the index of short term and impending earthquake prediction, based on analysis of interference factors such as air pressure and water level.
Key words:  Body strain  The solid tide distortion  Slow earthquake  Short imminent anomalies