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- W2945151246 abstract "Abstract. A large earthquake of 8.0 magnitude occurred on 12 May 2008, 14:28 UTC, with the epicentre in Wenchuan. To investigate the pre-earthquake anomalous strain changes, negentropy is introduced to borehole strain data for three locations, approximated by skewness and kurtosis, revealing the non-Gaussianity of recorded fluctuations. We separate the negentropy anomalies from the background by Otsu's method and accumulate the anomaly frequency on different scales. The results show that the long-term cumulative frequency of negentropy anomalies follows a sigmoid behaviour, while the inflection point of the fitting curve is close to the occurrence of the earthquake. For the short-term analysis before the earthquake, there are two cumulative acceleration phases. To further verify the correlation with the earthquake, we compare our findings for different time periods and stations and rule out the possible influence of meteorological factors. We consider the negentropy analysis to exhibit potential for studying pre-earthquake anomalies." @default.
- W2945151246 created "2019-05-29" @default.
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- W2945151246 date "2019-10-23" @default.
- W2945151246 modified "2023-10-18" @default.
- W2945151246 title "Negentropy anomaly analysis of the borehole strain associated with the <i>M</i><sub>s</sub> 8.0 Wenchuan earthquake" @default.
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- W2945151246 doi "https://doi.org/10.5194/npg-26-371-2019" @default.
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