Vol. 48 No. 1 (233) (2014)

In this paper were formulated the main unsolved problems of block structure of the territory of Armenia. The new scheme for block structure was built and the classification of those blocks was done. On the scheme of block structure of Armenia three mega blocks and 23 blocks of different classes are separated. As the boundaries of the mega blocks were accepted the deep faults that traditionally are considered as the boundaries among the tectonic zones. The great part of the blocks of first class, with some admissions, are separated more reliable. The boundaries of second classes must be corrected. The main type of movements by the boundaries of blocks during the strong earthquakes is strike-slip.

The present article focuses on the rheological properties of swelling clays. The test results show that the ratio liquefaction coefficient and water-colloidal fraction independently of soil physical state (density, moisture) is a constant quality.

In the article possibility of predictions about activation and expected movements of landslides and about their formulation in the landslide slopes, by parameters of geophysical fields and underground water composition are shown. Some researches in this field are still in development.

To solve practical problems, in particular for well-drilling, it is necessary to introduce methodical changes, which will make possible to show near-surface discontinuity. Using these methods we can qualify and improve some field data and interpret the received findings for using them in mapping.

In the article for evaluating soil degradation in Lori Marz, a new approach is applied which allows to embrace the majority of factors having influence on degradation process in spite of different measuring units.

Peculiarities of extreme runoffs formation, changes dynamics and recurrence of rivers in the Arpa River basin are discussed. The main peculiarity of formation of extreme runoffs is that both natural and anthropogenic factors have almost identical influence. In dynamics of absolutely maximal and absolutely minimal runoffs, generally reduction tendency is observed. If in case of maximal runoffs the risk degree has sharply decreased, then in case of minimal runoffs it has increased that makes river ecosystems most vulnerable.

In the development and prospect of any settlement or community an important role plays the age structure of the population and the ratio of the age groups. In the article on the base of age composition of the rural population in communities RA (2012.01.01) is given. The age structure of the rural population of RA, regional differences are given. Analysing rural community level of the distribution of the current population by age groups, as well as the main issues are given.

In the article the main urban-constructional problems of crisis situations being emerged as a result of natural disasters (particularly earthquakes) are being examined. The main geographical and urban-constructional factors affecting on scales of results of natural disasters are revealed. Activities directed to improvement of urbanconstructional management in crisis situations have been proposed. These may mitigate the results of natural disasters.

Based on generalization and reinterpretation of long-term data of electroexploration researches carried out in the south-western part of the massif mountain Aragats (Karakert-Aragats area), new maps and profiles of capacities and paleorelief of volcanic (effusive) formations have been compiled. This allowed us to obtain a more refined understanding of the hydrogeological conditions of the studied area. Identified buried groundwater basins and paleochannels are perspective areas for detection of fresh groundwater.