Magnetic and Ionospheric Effects of a Series of Strong Earthquakes on April 02–03, 2024 (Taiwan)

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Abstract

Based on the analysis of data from the Mikhnevo geophysical observatory of the IDG RAS and a number of observatories of the international INTERMAGNET network, the disturbances of the geomagnetic field in the surface atmosphere were considered during a series of strong earthquakes that occurred on April 02–03, 2024 in the vicinity of the island of Taiwan. It is shown that in the absence of significant global disturbances of the Earth’s magnetic field, earthquakes were accompanied by geomagnetic variations with a maximum amplitude of ∼10 nT and a total duration of about 4 hours. The delay time of the magnetic effect relative to the main shock of the first earthquake was ∼60 minutes. Based on the results of processing ionograms of height-frequency sounding obtained at the Okinawa ionospheric monitoring station and freely available on the website of the Japan National Institute of Information and Communication Technologies, the ionospheric effect of the event in question was established in the form of variations in the critical frequency of the F2 layer of the ionosphere.

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About the authors

V. V. Adushkin

Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Sciences

Author for correspondence.
Email: adushkin@idg.ras.ru

Academician of the RAS

Russian Federation, Moscow

A. A. Spivak

Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Sciences

Email: spivak@idg.ras.ru
Russian Federation, Moscow

S. A. Ryabova

Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Sciences

Email: riabova@idg.ras.ru
Russian Federation, Moscow

A. V. Tikhonova

Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Sciences

Email: tikhonova@idg.ras.ru
Russian Federation, Moscow

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2. Fig. 1. Variations of the magnetic field components 02-03.04.2024 from MHV data (the dotted line indicates the time of event 1 from Table 1)

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3. Fig. 2. Variations of the magnetic field components 02-03.04.2024 from data of INTERMAGNET observatories (observatory codes are given in the figure field). The blue and red dashed lines indicate the first and second by time perturbations of the magnetic field, respectively

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4. Fig. 3. Variations of the critical frequency of the ionospheric F2 layer at the ionospheric station ‘Okinawa’ on 02-03.04.2024 (the red dotted line indicates the first (1) and the second (2) periods of f0F2 perturbation)

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