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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS003 Oral Presentation 1859 Use of high-frequency geoacoustic effect for a location of earthquakes preparation areas Dr. Boris Shevtsov Far Eastern Branch Russian Academy of Science IAGA Anatolii Kuptsov, Igor Larionov, Yurii Marapulets, Andrei Perezhogin, Raya Sagitova, Gleb Vodinchar High-frequency (0-10 kHz) geoacoustic precursors of earthquakes are considered. It is shown, that during preparation of seismic events as result of increase in deformations, intensity and anisotropy of geoacoustic emission grow, and sound signals have as a first approximation a direction on an epicenter.The measurements of deformations carried out with the help of laser interferometer have shown, that high-frequency acoustic noise is the result of slip in the surface sedimentary breeds which are taking place in an condition of elastic pressure.Having in view the solution for tensor of elastic pressure and features of sound sources in the breeds the physical model of geoacoustic signal generation is created. It has explained three experimental results. In the first why the high-frequency geoacoustic effect arises on distances of hundred kilometers from epicenters. Second, why the earthquakes giving geoacoustic effect have strongly anisotropic spatial distribution around the point of measurements. Thirdly, why acoustic signals have a direction on an epicenter, and what explains the deviation of signal bearing.In the report, the opportunity of use of high-frequency geoacoustic effect for geodeformations monitoring and location of earthquake preparation areasis discussed. Keywords: geoacoustic, location, earthquake
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS003 Oral Presentation 1860 Ground Effects of Space Weather: climatology and forecast of extreme events Dr. Larisa Trichtchenko Natural Resources Canada Research Scientist Impacts of space weather events on ground infrastructures arise from the combined effects of large variations in geomagnetic field, ground conductivity structure, and topology of the affected network. These impacts range from slow, cumulative multi-year excessive corrosion of the pipeline systems to fast (in minutes) collapse of power grids during geomagnetic storms (Hydro-Quebec in March 1989, part of Sweden power grid in October 2003). Space Weather Regional Warning Centre in Ottawa, has longtime experience in working closely with industry to better address the needs for studies of climatology and for the forecast of the extreme events. For this session we present a short summary of our recent projects with industrial partners on both aspects. The first topic is the development of the methodology for assessing the effects of geomagnetically induced currents on pipeline infrastructure in . This includes statistical studies of the occurrences of different levels of geomagnetic activity, global and regional models of the ground conductivity and effects of the infrastructure topology. As a result, sequence of statistical maps for different areas of is produced. The second aspect, forecast of the extreme events for statistically different zones of geomagnetic activity in will be demonstrated using examples of the latest space weather events (2000-2007). Here we address the issue of importance of the proper provision of real-time ground and space data for forecast of ground effects of space weather events for local users. Keywords: space weather
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy<br />
(S) - <strong>IASPEI</strong> - International Association of Seismology and Physics of the Earth's<br />
Interior<br />
JSS003 Oral Presentation 1859<br />
Use of high-frequency geoacoustic effect for a location of earthquakes<br />
preparation areas<br />
Dr. Boris Shevtsov<br />
Far Eastern Branch Russian Academy of Science IAGA<br />
Anatolii Kuptsov, Igor Larionov, Yurii Marapulets, Andrei Perezhogin, Raya<br />
Sagitova, Gleb Vodinchar<br />
High-frequency (0-10 kHz) geoacoustic precursors of earthquakes are considered. It is shown, that<br />
during preparation of seismic events as result of increase in deformations, intensity and anisotropy of<br />
geoacoustic emission grow, and sound signals have as a first approximation a direction on an<br />
epicenter.The measurements of deformations carried out with the help of laser interferometer have<br />
shown, that high-frequency acoustic noise is the result of slip in the surface sedimentary breeds which<br />
are taking place in an condition of elastic pressure.Having in view the solution for tensor of elastic<br />
pressure and features of sound sources in the breeds the physical model of geoacoustic signal<br />
generation is created. It has explained three experimental results. In the first why the high-frequency<br />
geoacoustic effect arises on distances of hundred kilometers from epicenters. Second, why the<br />
earthquakes giving geoacoustic effect have strongly anisotropic spatial distribution around the point of<br />
measurements. Thirdly, why acoustic signals have a direction on an epicenter, and what explains the<br />
deviation of signal bearing.In the report, the opportunity of use of high-frequency geoacoustic effect for<br />
geodeformations monitoring and location of earthquake preparation areasis discussed.<br />
Keywords: geoacoustic, location, earthquake
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