Published in Seismic Instruments
The design of a 2D small aperture seismic array (SASA) installed in the central part of the East European Platform (in the area of the village of Mikhnevo, Moscow Oblast’) is discussed. Brief information is provided on the geologic structure of the upper section. The SASA configuration is described along with parameters of the seismological instrum...
Published in Seismic Instruments
Results of research and development of three velocimeter components in the form of an assemblage of mechanical seismic detector and boards of electronics, realizing stabilization of inertial mass zero point and formation of amplitude-frequency characteristic, are presented. Original electromagnetic system of mass suspension for the vertical variant...
Published in Seismic Instruments
The fundamentally new method of gravimetric observations is described, which is based on comparing the physically indistinguishable gravitational and inertial accelerations and has been developed by the Institute of Physics of the Earth n. a. O.Yu. Shmidt. Basics of theory of the gravimeter operation founded on this method are set forth. A peculiar...
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.
