Short-Term Anomalies Detected at Balguntay Station’s 4-Component Borehole Strain before the Hutubi MS6.2 Earthquake, Xinjiang, China
Abstract Analysis of the data from Balguntay station’s 4-component borehole strain shows significant short-term abnormal changes in pressure. We exclude interference from equipment, weather and the environment. We consider that the abnormal change is true and may be an earthquake precursor anomaly. The anomaly is extracted using the overrun rate and S-transform time-frequency analysis. The results show the signal is concentrated in the 1 440~10 min band. The maximum signal strength of NS and EW components are 185×10-10, 140×10-10. This article also discusses the characteristics of such anomalous changes and makes a preliminary analysis of the causes.
Key words :
borehole strain
S-transform
time-frequency
short-term abnormal
Cite this article:
GAO Lijuan,ZHAO Binbin,XING Ximin et al. Short-Term Anomalies Detected at Balguntay Station’s 4-Component Borehole Strain before the Hutubi MS6.2 Earthquake, Xinjiang, China[J]. jgg, 2018, 38(8): 868-872.
GAO Lijuan,ZHAO Binbin,XING Ximin et al. Short-Term Anomalies Detected at Balguntay Station’s 4-Component Borehole Strain before the Hutubi MS6.2 Earthquake, Xinjiang, China[J]. jgg, 2018, 38(8): 868-872.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2018/V38/I8/868
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