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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/npg-2019-22
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/npg-2019-22
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 May 2019

Research article | 14 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Nonlinear Processes in Geophysics (NPG).

Negentropy anomaly analysis of the borehole strain associated with the Ms 8.0 Wenchuan earthquake

Kaiguang Zhu1,2, Zining Yu1,2, Chengquan Chi1,2, Mengxuan Fan1,2, and Kaiyan Li1,2 Kaiguang Zhu et al.
  • 1College of Instrumentation and Electrical Engineering, Jilin University, China
  • 2Key Laboratory of Geo-Exploration Instrumentation, Ministry of Education, Jilin University, China

Abstract. A large earthquake of 8.0 magnitude occurred on 12 May 2012, 14:28 UTC, with the epicenter in Wenchuan. To investigate the pre-earthquake anomalous strain changes, negentropy is introduced to borehole strain data at Guza station, 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 in different scales. The results show the long-scale 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-scale analysis before the earthquake, there are two cumulative acceleration phases corresponding to the two crustal stress releases, indicating the preparation process of the Wenchuan earthquake. We consider that negentropy exhibits potential for the analysis of earthquake precursor anomalies.

Kaiguang Zhu et al.
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Kaiguang Zhu et al.
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Short summary
The borehole strain data of the Guza station are used to study the negentropy anomalies before the Wenchuan earthquake. We observed the distribution of anomalies in the skewness-kurtosis domain and accumulated the anomaly frequency over time. Our results show: 1) The earthquake moment is proved to be a critical time during the whole earthquake process. 2) Two cumulative acceleration phases are corresponding to the two crustal stress releases, which may be the precursors to the earthquake.
The borehole strain data of the Guza station are used to study the negentropy anomalies before...
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