Published in Seismic Instruments
The results of experimentally investigating the fluctuation parameters of four slight-mechanical-displacement meters via the method of “force cooling” of their low-Q-factor mechanical oscillators are presented. In the course of the experiment at the temperature T = 300 K during continuous observation of the coordinate of a test weight of an oscilla...
Published in Seismic Instruments
The current version of a hardware-software system intended for monitoring the underground acoustic noise in the upper part of the Earth’s crust is described. The architecture of the hardware-software system is considered, and its component parts and the principle of their operation are described along with the algorithm of preliminary data processi...
Published in Seismic Instruments
As a result of the analysis of both the monitoring data of the electric resistivity of the Earth’s crust at the Garm test site using a modified method of dipole sounding and the earthquake catalogue of this test site it is shown that annual periodicity exists not only in the variations of the electric resistivity of the Earth’s crust but also in se...
Published in Seismic Instruments
Detailed analysis of the information contained in the earthquake catalogue of the Kyrgyz digital broadband seismic network over the period from 1994 to 2005 is performed. The graphs of earthquake recurrence were plotted and analyzed. The energy threshold of representativeness of the catalogue was determined. Stroboscopic and Fourier spectra of time...
Published in Seismic Instruments
The possibilities of recovering long-period ground vibrations from the records of short-period seismometers, geophones, and vibration sensors are considered. The procedures of recovering vibrations with periods equal to several minutes and several hours from initial seismograms recorded by short-period seismometers are presented.
Published in Seismic Instruments
Some results are presented from an experimental study of the natural microtremor field on an active landslide-prone slope using a KMV seismometer. Anomalous zones of increased microtremor amplitude have been identified within this landslide feature corresponding to zones of density deficit. It is shown that the velocity characteristics in the upper...
Published in Seismic Instruments
The problem of interaction between a ring-type electromagnetic inductor and a coaxial line based on logging armored cable-ropes in conducting and semiconducting natural media is considered.
Published in Seismic Instruments
Upgrading of the electrical resistance variometer GEOMES-R6 of the Institute of Geophysics of the Poland Academy of Sciences, with enhancement of functional capabilities of the GEOMES assemblage for its application in laboratory measurements on rock samples, has been carried out. The assemblage operation principle, specifications, and theory of ope...
Published in Seismic Instruments
Multiparameter geophysical observatory was established in North Caucasus, near Elbrus Volcano, in 2001 by the scientists of Otto Schmidt Institute of Physics of the Earth (IPE) of Russian Academy of Sciences (RAS) with support of Institute for Nuclear Research (INR) RAS and Berbekov Kabardino-Balkar State University (KBSU) to study possible reawake...
Published in Seismic Instruments
Results of study of shear fracture under loading are considered which are obtained in solid-model experiments by means of making a simultaneous record of a displacement, load value, and acoustic pulses occurring due to jumps of the fracture edges displacement. The recording has been conducted with the help of the data acquisition and processing sys...
