HR: 16:45h
AN: NG44A-03 INVITED    [Abstracts]
TI: Active Monitoring Using Powerful Vibrators in Seismic Regions of Siberia
AU: * Seleznev, V
EM: sel@gs.nsc.ru
AF: Geophysical Survey of Siberia Branch of the Russian Academy of Sciences, Koptyug Pr., 3, Novosibirsk, 630090, Russian Federation
AU: Soloviev, V
EM: solov@gs.nsc.ru
AB: Current methods of mid-term and short-term earthquake forecasts can not guarantee acceptable level of reliability for public announcement. Physical analysis of available precursors has serious problems when precursors contradict each other. However, Nature can't be contradictory – it is our ideas on deformation process in the Earth are contradictory because of lack of data and analysis. In this connection, we see growing interest in measurement and analysis of appearances of reflected waves from focal zones of imminent earthquakes. Methods of active monitoring can provide necessary data and analysis. Authors see the main source of vital information in quantitative and qualitative physical characteristics (of structure and properties of focal zones), which are measured in a process of active geophysical monitoring. We suggest that this approach enables forecasts of earthquakes with acceptable reliability. We give a review of seismicity and seismological observations in the Siberia territory, as well as of geophysical monitoring results obtained for the south of Baikal Lake, in the Altay-Sayan area in the Western Siberia. Special attention is given to the methods of active monitoring with powerful vibrators which have been actively developed in Siberian Branch of the Russian Academy of Sciences. There are data recorded for "near" and "far" fields from powerful 60-100 tons vibration sources which are obtained for the active seismic zones and for the zone of a large reservoir. Usage of powerful vibrators enables not just passive observations of stress built up, but management of average stress changes without affecting the background seismicity.
DE: 7200 SEISMOLOGY
SC: Nonlinear Geophysics [NG]
MN: 2007 Fall Meeting