POSSIBLE ASSOCIATION BETWEEN SOME GEOMAGNETIC ANOMALIES AND VRANCEA (ROMANIA) SIGNIFICANT EARTHQUAKES OCCURRED IN THE YEAR 2005

摘要

The association between geoelectromagnetic anomalies and Vrancea earthquakes of moment magnitudes 3.7 ≤ M_W ≤ 5 was first proved by Enescu et al. in the papers. This finding was extended by Enescu to a broader magnitude range 3.7 ≤ M_W ≤ 6.3. The study made in [3] proves that observable precursory anomalies in the geomagnetic impedance have preceded all Vrancea earthquakes of moment magnitudes M_W ≥ 4.0 occurred in 2004 year. A similar study is made in the present paper for data recorded in 2005 year (Fig. 1). This study confirmes the main result obtained in the papers, namely that the great majority of Vrancea earthquakes of magnitudes higher than 4 are associated with precursory anomalies in the geomagnetic impedance. It also seems that neither the precursor time nor the amplitude of the precursory magnetic anomaly can be linked reliably with the magnitude of the anticipated earthquake.