Ionospheric anomalies related to the Mw 6.5 Samar, Philippines earthquake

Eroglu, Emre

doi:10.1007/s11600-022-00980-8

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Tytuł artykułu

Ionospheric anomalies related to the Mw 6.5 Samar, Philippines earthquake

Autorzy

Eroglu Emre

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-022-00980-8

Warianty tytułu

Języki publikacji

Abstrakty

Models belonging to the ionosphere that is directly affected by factors such as solar activity, geomagnetic storm, earthquake, seasonal changes, and geographical location need to be considered altogether. In this sense, the cause of the ionospheric anomalies should be meticulously distinguished from each other. Ionospheric anomalies that occur before or (and) after an earthquake have a serious place in earthquake prediction studies. Total electron content (TEC) is one of the significant parameters to be able to discuss the anomalies of the ionosphere. This essay investigates ionospheric anomalies before and after the Mw 6.5 Samar, Philippines (12.025° N, 125.416° E and November 18, 2003, at 17:14 UT) earthquake. The paper analyzes anomalies with the aid of the TEC (TECU) map. In the paper, the time-domain TEC variables are transferred to the frequency-domain for observing some clues-peaks by short-term Fourier transformation spectral analysis. The discussion handles the effect of the solar activity with the F10.7 (sfu) index and the effect of geomagnetic storms with Bz (nT), v (km/s), P (nPa), E (mV/m), Kp (nT), and Dst (nT) parameters (index). The lower and upper boundaries of the TEC map obtained from the International Reference Ionosphere (IRI-2016) are calculated with the help of median and standard deviation. The boundary-setting process is named statistical analysis. TEC data exceeding the boundaries are marked as anomaly data. According to the paper, 11-day anomalies (9-day of which belong to pre-earthquake) are detected. Probably, the anomalies observed on November 6, 7, and 12 belong to the Samar earthquake.

Słowa kluczowe

Samar Philippines earthquake Total Electron Content TEC geomagnetic storm solar activity SA GS

Samar trzęsienie ziemi na Filipinach całkowita zawartość elektronów TEC burza geomagnetyczna aktywność słoneczna

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2023

Tom

Vol. 71, no. 2

Strony

601--611

Opis fizyczny

Bibliogr. 58 poz.

Twórcy

autor

Eroglu Emre

eroglumre@gmail.com

Department of Mathematics, Kirklareli University, 39100 Kirklareli, Turkey

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).

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Bibliografia

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