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Possibility for identifying the new subduction zone from ionospheric anomaly for a deep earthquake (625.9 km) on 14 August 2012, M = 7.7 near Poronaysk, Russia: a two-dimensional principal component analysis

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Abstract

A two-dimensional principal component analysis (2DPCA) has been performed to examine ionospheric total electron content (TEC) data in order to detect TEC precursor for a deep earthquake that occurred at 02:59:42 on 14 August 2012 (UTC) (M w  = 7.7) with its depth at 625.9 km near Poronaysk, Russia. The examined TEC data were during the time period from 00:00 on 09 August to 02:50 on 14 August 2012 (UTC), which were 5 days before the earthquake, because the ionospheric precursors usually revealed in such time period (Liu et al. 2006). An ionospheric TEC precursor with the larger principal eigenvalues of 2DPCA has been localized around the epicenter during the time period from 02:25 to 02:30 on 14 August 2012 (UTC), and the duration time was at least 5 min. Ionizing radiation radon gas release should be a possibility to cause the anomalous TEC fluctuation, e.g., electron density variation. If an amount of radiation radon, which caused the TEC anomalies, was trapped in the asthenosphere, then the asthenosphere should be very thick with deep bottom in this zone which belongs to the subduction zone between the Pacific plate and North America. A zone that was previously unknown to be the subduction zone could now be identified as through an earthquake-related TEC anomaly. Therefore, in this study, not only TEC anomaly could be detected, but also a new plate boundary with subduction zone is possible to be found. However, if this very deep earthquake does indeed record inter-plate seismicity, then the asthenosphere in this region must have large thickness.

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Acknowledgments

The author is grateful to NASA Global Differential GPS system (GDGPS) and Space Weather Prediction Center for the useful reference data.

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  1. Department of Earth Science, National Cheng Kung University, No. 1 University Road, Tainan City, Taiwan

    Jyh-Woei Lin

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  1. Jyh-Woei Lin
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Correspondence to Jyh-Woei Lin.

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Lin, JW. Possibility for identifying the new subduction zone from ionospheric anomaly for a deep earthquake (625.9 km) on 14 August 2012, M = 7.7 near Poronaysk, Russia: a two-dimensional principal component analysis. Arab J Geosci 8, 5141–5151 (2015). https://doi.org/10.1007/s12517-014-1555-z

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