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Seismic noise of Snowfru (Dahshru) pyramid: the cosmos component
by
Oleg B. Khavroshkin
Head of lab.
Coauthors: D.G. Pavlov, V.V. Tsyplakov
SEISMIC NOISE OF SNOWFRU (DAHSHRU) PYRAMID:
THE COSMOS COMPONENT
O.B. Khavroshkin*, D.G. Pavlov** V.V. Tsyplakov*
* Schmidt Institute of Physics of the Earth, Russian Academy of Sciences.B. Gruzinskay 10, Moscow, D-242, 123995, GSP-5, Russia.
** Firm Antares.Moscow.
Adequate understanding of informative content of the seismic noise is impossible without introduction of concept of the seismically active medium adapted to conditions of pyramids. We know several constructive characteristics of such medium: investigation of part of accumulated internal potential energy in form of seismic (acoustic) waves in wide range of frequencies (seismic-acoustic emission); parametric amplification of the wave train, propagating through the geological medium, which is in the near-critical condition close to damage; self-synchronization and auto-generation of waves in medium volume, containing defects, which form, for example, the ensemble of renewable bistable elements (cracks). The seismic noise, registered without detection of envelope, is analyzed as two separate units: in the spectral range 0 - 6 Hz and in the range 0 - 180 Hz. All peaks and particularities of the geophysical medium were analyzed in the range 0 - 6 Hz, and only one peak in the range 0 - 180 Hz was analyzed in details. Both ranges were also investigated by the method of spectral-time analysis. It was considered the existence of several types of seismically active medium: 1) seismic-acoustic emission field of the pyramid body; 2) seismic-acoustic field of the medium near and, first of all, under the pyramid; 3) dynamics of microstructural rearrangement of the sand in top part of geologic cross-section of the region ("singing sands"); 4) seismic emission processes, connected with influence of active tectonic movements in the region, tides etc.; 5) chaotized seismic wave field of the region.
In low-frequency part of the spectrum the comparison of parameters of the seismic noise with groups of pulsars shows the stable mutual conformity of these parameters, and it confirms the hypothesis about contribution of space influence on low-frequency spectral peaks of noises of Snowfru pyramid.
High-frequency part of the spectrum: peak near 17 Hz was observed earlier, but its predominant value is observed for the first time; there exists one more feature - existence of the space source, pulsar PSR 1913+16 with the period P = 0.059 s (16.95 Hz), radiation of which also influences the geologic media and pyramid. Amplitude of this influence is by many orders lower than above-mentioned processes, but it is significantly higher due to stability of the frequency. The spectral-time analysis has shown that there takes place episodic capture and synchronization of the seismic noise signal in the range 16.5 - 17.2 Hz on the frequency 16.95 Hz, i.e. amplification of the weak signal of space origin from the pulsar PSR 1913+16 for account of low-Q regional signal and the pyramid resonance.
The most real explanation of other features of the spectrum is the existence of powerful background of seismic emission of the pyramid and the geological medium under the pyramid.
General conclusions.
1. The seismic noise of Snowfru pyramid is of non-linear nature, and its structure has the high sensitivity to external influences.
2. Different parts of the spectrum of the seismic noise have different physical mechanisms of their formation.
3. Low-frequency part of the spectrum reflects the cooperative processes of influence and interaction of energy of seismic noises of pyramid and medium and external space influence of the majority of known pulsars.
4. Isolated peaks in high-frequency part of the spectrum of seismic noise, and first of all on frequency 17 Hz, are also determined by several energetic mechanisms, and the analysis of such structure of the peak shows the influence of space radiation of the pulsar PSR 1913+16 and technogenic component on f0 / 3 (f0 = 50 Hz).
5. It is necessary to conduct the search for space influence in the seismic noise not only through correlation of frequencies of peaks in noise spectra with the frequencies of the pulsars, but through observation and probation of existence of non-linear nature of the seismic noises, physical mechanisms of their existence and influence of external space source on these noises.
6. It is necessary to develop the model of a pulsar with two-fold radiation of electromagnetic pulse per 1 rotation.
Date received: July 19, 2004
Copyright © 2004 by the author(s). The author(s) of this document and the organizers of the conference have granted their consent to include this abstract in Atlas Conferences Inc. Document # caon-14.