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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 11:33 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
The geomagnetic field variations recorded in Vrancea zone during 2000-2008 and the seismic energy release
Authors:
Andrei MIHAI(1,2), Iren Adelina MOLDOVAN(2), Victorin Emilian TOADER(2), Mircea RADULIAN(2)
*
Affiliation:
1)Facultatea de Fizica, Universitatea din Bucuresti, Atomistilor 405, POB MG-11, RO-077125, Bucuresti-Magurele, Romania
2)Institutul National pentru Fizica Pamantului , RO- 077825, str. Calugareni , no 12, Magurele, Ilfov, Romania
E-mail
mihai.a.andrei@gmail.com
Keywords:
geomagnetic anomalies, intermediate earthquakes, Vrancea zone,seismic energy released
Abstract:
This paper presents the relationship between anomalous geomagnetic variations recorded at the Muntele Rosu (MLR) station and the occurrence of intermediate-depth earthquakes. This research carries out geomagnetic data from September 2000 to May 2008. To better distinguish local anomalies from external geomagnetic variations (geomagnetic storms), the datasets recorded at Muntele Rosu (MLR), located inside the seismogenic zone, were compared with datasets recorded at Surlari (SUA), located 100 km away from the seismogenic area. For each geomagnetic anomaly identified, the seismic energy released daily was plotted logarithmically along with seismicity and Kp indices. So far, the variations are recorded only on the By component of the magnetic field and show two patterns, variations on the By component agree with small decreases/increases recorded over long periods and high decreases/increases of By component over long periods. To confirm the link between the magnitude of the geomagnetic anomaly measured at the Muntele Rosu seismic observatory (MLR) and the seismic activity of each anomaly, the standard deviation recorded on the By component of the magnetic field for each anomaly was calculated and compared to the total seismic energy released. The standard deviation measured on the By component (SDby) showed high values for anomalies accompanied by high seismicity and low values for anomalies with low seismicity. The morphology and variability registered on the By component of these local anomalies can be used in the partial prognosis of the seismicity from the Vrancea seismogenic zone. The correlation of the standard deviation with the released seismic energy will validate these models of local magnetic field behavior, and in the future, the standard deviation for the By component will be calculated for the 2000–2020 period.
Acknowledgement:
The present study was supported by Phenomenal Project PN-III-P2-2.1-PED-2019-1693, SPEIGN project PN-II-P2-2.1-PTE-2019-0459, and AFROS project ID-PCE-2020-1361, 119 PCE/2021 supported by UEFISCDI. The authors would like to acknowledge the support from the NUCLEU Program PN 19 080102.
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