Vladimir Bakhmutov

Geomagnetic Disturbances and Seismic Events in the Vrancea Zone from in Situ Data

Based on example from the Vrancea’s concentrated seismicity zone the connection between definite type of geomagnetic disturbances and 200 earthquakes during the period of 1988–1996 is shown. The energy classes of earthquakes are related to abrupt changes (“gradients”) in H-component of geomagnetic field. Taking into account the temporal interval from maximum of sub-storm up to the shock, the relationship between geomagnetic disturbances and earthquakes is always positive. The time interval between maximum of polar sub-storm and earthquake is correlated with the depth of the earthquake. Differences in the duration of polar substorms before crustal (shallow) and deep earthquakes are revealed. Four main types of morphological features of geomagnetic variations preceding the seismic event are established.

Environment and age of marginal formations of the last ice sheet in the southeastern Kola Peninsula

Abstract Studies of marginal glacial features in southeastern Kola Peninsula provide evidence that the eastern part of the northern Terskiye Keyvy ridge systems began to form between the Ponoy Ice Dome and the White Sea Ice Lobe, and later developed along the margin of the latter. The process most probably occurred throughout the whole of the Early Dryas. The second marginal belt (lying farther south) was also formed by the ice lobe which flowed across the White Sea basin, but is attributed to the Middle Dryas. Therefore for the first time data are presented which clearly indicate that marginal features corresponding to the Luga and Neva glacial stages were formed in the Kola Peninsula.