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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:58 |
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Conference: Bucharest University Faculty of Physics 2024 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Two Decades of Geomagnetic Studies Near the Seismic Vrancea Zone: Links to Seismic Activity and Meteorological Conditions
Authors:
Andrei MIHAI(1,2), Mircea RADULIAN(1,3) Victorin Emilian TOADER(1), Iren-Adelina MOLDOVAN(1)
*
Affiliation:
1)National Institute for Earth Physics RO- 077825, Calugareni st, no 12, Magurele, Ilfov, Romania
2)Faculty of Physics, University of Bucharest, Atomistilor 405, POB MG-11, RO-077125, Bucharest-Magurele, Romania
3)Academy of Romanian Scientists, Splaiul Independentei 54, Bucharest
E-mail
mihai.a.andrei@gmail.com
Keywords:
geomagnetic variations, seismic energy release, standard deviation, correlation coefficient, temperature, humidity
Abstract:
This study presents the long-term behavior of the geomagnetic field measured in proximity to the Vrancea zone from 2002 to 2021. All seasonal variations recorded on the eastern component were identified by comparing them with a geomagnetic reference station located 100 km away. The variability observed on the By component was analyzed by calculating the standard deviation for each identified variation. To discriminate the variations caused by solar activity, we also calculated the standard deviation for the reference station. This method helps distinguish the global variations generated by magnetosphere-solar interactions from the abnormal ones. For each identified variation, we calculated the cumulative seismic energy release to determine if there is a relation between the variability recorded on By and the seismic energy release. To verify the true nature of these variations, we used additional data from a new magnetometer installed at the same location, an indoor temperature and humidity sensor, and a professional weather station installed outside. To validate the relationships between By variability and seismic energy, temperature, humidity, and the Kp index, we used a statistical measure that quantifies the relationship between two continuous variables. The results of the correlation coefficient show a good correlation (r = 0.81) between By variability measured at the reference station and the mean Kp indices. A weak positive correlation (r = 0.29) was obtained between By variability measured at Muntele Roșu and seismic energy. In contrast, a strong positive correlation (r = 0.84 and r = 0.79) was found between By variability and indoor temperature and humidity. The new magnetometer installed in 2019 also shows a good correlation with temperature but with negative signs, which is normal for fluxgate magnetometers when the factory temperature compensation is some error degree.
Acknowledgement:
This study was carried out within Nucleu Program SOL4RISC, supported by MCI, project no PN23360201
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