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EFFECTS OF SYNCHRONIZATION BETWEEN ULTRA LOW FREQUENCY GEOMAGNETIC COMPONENTS VARIATIONS AND SEISMIC NOISE
Abstract
We analyze a series of data in the ultra-low frequency (ULF) range of geomagnetic variations, which are collected from search coil instrument and acquisition system at Panagyuriste, Geomagnetic Observatory (PAG), Bulgaria, a part of South European Geomagnetic Array (SEGMA, http://sole-terra.aquila.infn.it/it/), and data for seismic noise collected at three Bulgarian seismic stations (VTS, RZN and KDZ part of National Operative Telemetric System for Seismological Information) and three Turkish seismic stations (GOM, KULA and ALAN, https://www.orfeus-eu.org). The analyzed time period begins at 01 December 2019 and lasts till 31 January 2020. DFA (detrended fluctuation analysis) scaling characteristics for two different time scales (10 ? 180 sec. and 10 ? 900 sec.), Hurst exponent and the coherence of the geomagnetic and seismic signals are determined and discussed. Wavelet analysis is applied to calculate and identify the dynamical behavior of the coherence of the width of singularity spectrum and of Hurst exponent for the vertical seismic components and the three geomagnetic components variations. We observe an unusual behavior in all investigated parameters, which appears since the 22-nd of December 2019 till the end of January 2020 and two other periods (22-24 December 2019 and 10-12 January 2020) with unusual low levels for DFA exponent which appears for the vertical (Z) component of the geomagnetic field variations. Based on the results obtained, we assume that such behavior of the studied parameters is not accidental and are most probably related to natural phenomena.
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