Study of ionospheric variations before the Tohoku earthquake in search of precursory anomalies

Авторы: Savelyeva N.V., Pilipenko V.A.
Сборник: Problems of Geocosmos—2024. Proceedings of the XV Conference and School
Серия: Springer Proceedings in Earth and Environmental Sciences
Тезисы
Год издания: 2025
Издательство: Springer
Местоположение издательства: New York
Номер статьи: GC2024-STP003
Аннотация: A new approach for earthquake precursors analysis based on anomalous variations of electron concentration in the ionosphere is proposed. We concentrated on variations of total electron content (TEC) of the ionosphere inte-grated over the earthquake region and critical frequency of the F2-layer (foF2) measured by ionosonde network before the catastrophic Tohoku earthquake on March 11, 2011 near the east coast of Japan. The proposed approach is based on representation of TEC/foF2 as a time series and its fur-ther analysis using the Seasonal-Trend decomposition with LOESS (STL) algorithm. The anomalous variations of TEC and foF2 were found simultaneously over the area of the Tohoku earthquake epicenter. These variations cannot be attributed to external influences, such as diurnal variations, solar or geomagnetic activities. The algorithm revealed that all the major after-shocks of the Tohoku earthquake were also preceded by anomalous varia-tions of TEC/foF2.
Добавил в систему: Савельева Наталья Валерьевна

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