Scholarly record

DETERMINING OF AREAS ON THE TERRITORY OF R BULGARIA WITH A LOW INTENSITY OF THE RECENT VERTICAL MOVEMENTS OF THE EARTH'S CRUST

Slaveyko Gospodinov, Kremena Stereva

Abstract

Often, during the analysis of the Recent vertical motions of the Earth?s crust, it?s operating by the knots of the benchmarks in networks with different range. Usually, various models of a dynamic behavior of the benchmarks are postulating. But there isn?t a model, which is not devoid with indefinable in translation. The problem with indefinable is corresponding with the problem for a choice of a fundamental (?immovable?) benchmark. For an ?immovable? benchmark could be chosen an arbitrary benchmark in the network. It is necessary a preliminary geological and seismological information about the region. And even in the presence of a similar information, it is impossible we know with confidence if a benchmark has changed its position during the investigated period. At the same time, for a stable and correct adjustment of the levelling network is necessary at least one of the benchmarks to be accepted as basic, which in the case means ? relatively stable. A possible decision, in this context, is to be detected ?relatively stable?, from a geodynamic point of view, areas on the territory of RBulgaria. With that end in view, the results from fully completed, for the present, three cycles of measurements between the benchmarks in the State levelling network- I class are analyzed. The accent at the time of the analysis is based on the variations of the height-differences between the identical benchmarks in the network, determined on the base of the measurements during the different cycles. There is made a suggestion the executed approach of investigation to become a basis about a well-grounded choice of a main (?initial?) benchmark and for a new entirely readjusting of the network in each different cycle.

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