Abstract
Ionospheric anomalies possibly related to significant earthquakes (EQs) have been extensively investigated in recent years and could be considered promising for short-term EQ prediction. In this work, we study the subionospheric propagation data recorded during a time period of 3 years (1/1/2014–28/02/2017) by a network of 8 VLF/LF receivers deployed throughout Japan, to identify possible signatures of pre-EQ processes. Specifically, we analyzed the nighttime receiver amplitude data possibly related to any main EQ event with magnitude MW ≥ 5.5 that occurred in a wider area of Japan during the above-mentioned time period (16 main EQ events) by applying the method of critical fluctuations which is able to identify critical dynamics. Our results identified intermittency-induced criticality in the lower ionosphere before all the main seismic events that occurred in Japan during the time period of interest. Criticality was also identified prior to other global or local extreme events such as magnetic storms, solar flares and volcano eruptions, that happened during the analyzed time period, indicating that more research efforts combining the results of more analysis methods, should be devoted in the future in order to discriminate between the subionospheric perturbations related to EQs and the ones related to other extreme geophysical events.
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Acknowledgements
The authors would like to express their gratitude to Earthquake Analysis Laboratory for providing us with the VLF data, to the United States Geological Survey for the access to the Advanced National Seismic System (ANSS) Comprehensive Earthquake Catalog (ComCat) (https://earthquake.usgs.gov/earthquakes/search/), to the World Data Center for Geomagnetism, Kyoto (http://wdc.kugi.kyoto-u.ac.jp/) for the access to Dst index data, to the Global Volcanism Program of Smithsonian Institution (https://volcano.si.edu/search_eruption.cfm) for the access to the Volcanoes Eruption Database and to the Hinode Flare Catalogue (https://hinode.isee.nagoya-u.ac.jp/flare_catalogue/) for access to the solar flare database. Thanks are also due to Dr. Y. Contoyiannis for constructive discussions on the results.
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Politis, D., Potirakis, S.M. & Hayakawa, M. Criticality analysis of 3-year-long VLF subionospheric propagation data possibly related to significant earthquake events in Japan. Nat Hazards 102, 47–66 (2020). https://doi.org/10.1007/s11069-020-03910-3
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DOI: https://doi.org/10.1007/s11069-020-03910-3