***************************************************************** From: Jan Sileny <jsi@xxxxxxxxx> ***************************************************************** Dear colleagues, The deadline for abstracts to European Seismological Commission ESC 2008, 31st General Assembly,"Creta Maris", Hersonissos, Crete, Greece, from 7 to 12 September, 2008 is approaching. Abstracts are expected before 15 June 2008. Contributions (oral and poster) are invited for the thematic area: 3. Physics of the Earthquake Source Session Code: PHYS-2 - SOURCE Session Title: Natural and induced earthquakes: Double Couple and non-Double Couple source mechanisms Please visit the website at: http://www.esc2008.org/sprogramme.aspx With best wishes, Jan Sileny, Bruce R. Julian Session Conveners Jan Sileny Geophysical Institute, Academy of Sciences Bocni II/1401, 14131 Praha 4, Czech Republic Tel: +420-267103016 Fax: +420-272761549 E-mail: jsi@xxxxxxxxx Bruce R. Julian Earthquake Hazards Team E-mail: julian@xxxxxxxx U. S. Geological Survey Office: 650/329-4797 345 Middlefield Rd., MS977 FAX: 650/329-5163 Menlo Park, CA 94025 Session Description: The traditional view that earthquakes are caused by shear faulting has broadened in recent decades, as data from dense networks and sophisticated (e.g. broad-band) seismometers have identified departures from the "double couple" (DC) source model, particularly in environments such as volcanoes and exploited geothermal and hydrocarbon reservoirs. Understanding the physical source processes of these events is important both as fundamental science and for application to volcano monitoring and energy extraction. At the same time, however, more complicated non-DC source models are more difficult to quantify experimentally, and their study raises challenging problems of the uniqueness of derived mechanisms, the resolving power of various methods and data types, the effects of noise, and biases that may result from effects such as anisotropy and inevitable deficiencies in models of Earth structure. These problems can introduce spurious non-DC components into calculated source mechanisms, so realistic error budgets must be taken into account to avoid erroneous interpretation of experimental results. If this is done, adoption of the moment-tensor formulation allows non-DC components to be derived reliably and offers the chance to study important structural features and source processes involving fluids that are ignored in pure shear-slip source models. ============================================================== To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxxx To contribute to the volcano list, send your message to: volcano@xxxxxxxx Please do not send attachments. ==============================================================
