2008年汶川MS8.0地震电离层图像信息长时程演化初探

Abstract

Abstract: In this paper, modified PI method was applied to analyze ionospheric anomalous disturbances of Wenchuan M_S8.0 earthquake with the data from France DEMETER electromagnetic satellite (electron temperature) for retrospective forecast research. Abnormal pattern evolution characteristics of the Wenchuan M8.0 earthquake was carried out. Compared with previous research about extracting seismo-ionospheric abmormal disturbance, the retrospective timescale was extended to nearly 11 months before the earthquake and 48 days after the earthquake. In the long-term continuous evolution patterns, there were two periods of obvious abnormal disturbance. And in the short term before the impending earthquake, abnormal disturbance significantly reduced and tended towards the background. The location, shape and duration of the abnormal disturbances in the two periods were not repeated, which reflects the uncertainty of the precursory anomaly and the difficulty of qualitative analysis and quantitative identification. The long timescale research of precursor anomalous disturbance characteristics of ionosphere in this paper has practical function for evaluating its forecast parameters and model reliability. It could be used to accumulate experience for the application of the satellite data and forecast earthquake.

Key words: Modified pattern informatics, Retrospective forecast, DEMETER satellite, Seismo-ionospheric abnormal disturbance, The 2008 Wenchuan M_S8.0 Earthquake

CLC Number:

P315.7

SONG Cheng, ZHANG Yong-xian, XIA Cai-yun, ZHANG Xiao-tao. Long-term Ionospheric Evolution Characteristics Associated with the 2008 Wenchuan M_S8.0 Earthquake using Modified Pattern Informatics[J]. EARTHQUAKE, 2019, 39(2): 135-146.

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Long-term Ionospheric Evolution Characteristics Associated with the 2008 Wenchuan M_S8.0 Earthquake using Modified Pattern Informatics

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Long-term Ionospheric Evolution Characteristics Associated with the 2008 Wenchuan MS8.0 Earthquake using Modified Pattern Informatics

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Long-term Ionospheric Evolution Characteristics Associated with the 2008 Wenchuan M_S8.0 Earthquake using Modified Pattern Informatics