Geodesic
Short temporal variations of electrotelluric field in the vicinity of the earthquake source-site in the Sakhalin island
Vestnik KRAUNC. Fiziko-matematičeskie nauki, Tome 46 (2024) no. 1, pp. 134-164

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The work represents the results of analysis of electro-telluric potentials data obtained at the Yuzhno-Sakhalinsk test site (deployed in June 2023on the territory of the IMGG FEB RAS). Unexpectedly, a new kind of signals – series of quasiperiodic spikes (pulses) in night times were found in first few months after start of recording. Signals of 4-5 s length and of 130-150 s repetition period have a various waveform, which is derived from some primary quasi-sinusoidal signal. Such series were recorded from July 20 to September 11, 2023, and their average duration was nearly 8-9 hours. No episodes were found after September 12, up to December 20. The maximal intensity of the signals and the series as a whole was revealed in the period from 5 to 10 August. During this period the moderate earthquake M=3.8 occurred on 9 August, 2003 in the vicinity of measurement point (within a circular zone of 0.25 degrees radius around the test site) It was the strongest event from pair of that occurred in the given zone, the magnitudes were being M = 3.8 (08/09/2023) and M = 3.1 (09/19/2023). No similar series were observed before the second earthquake, being the weaker. Origination of quasiperiodic pulses series could be related to the preparedness of earthquake source – site. However extra surveys are required to proof this hypothesis.
Keywords: series of electrical signals, precursor, telluric field, earthquake, distorted signal. 
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     author = {A. S. Zakupin and I. P. Dudchenko and L. M. Bogomolov and S. A. Gulyakov and A. I. Kazakov and N. S. Stovbun},
     title = {Short temporal variations of electrotelluric field in the vicinity of the earthquake source-site in the {Sakhalin} island},
     journal = {Vestnik KRAUNC. Fiziko-matemati\v{c}eskie nauki},
     pages = {134--164},
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     number = {1},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VKAM_2024_46_1_a7/}
}
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A. S. Zakupin; I. P. Dudchenko; L. M. Bogomolov; S. A. Gulyakov; A. I. Kazakov; N. S. Stovbun. Short temporal variations of electrotelluric field in the vicinity of the earthquake source-site in the Sakhalin island. Vestnik KRAUNC. Fiziko-matematičeskie nauki, Tome 46 (2024) no. 1, pp. 134-164. http://geodesic.mathdoc.fr/item/VKAM_2024_46_1_a7/