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Calibration of 3D Upper Mantle Structure in Eurasia Using Regional and Teleseismic Full Waveform Seismic Data. (Report for October 15, 2004-January 15, 2005).

DE2005838993

Publication Date	2005
Personal Author	Romanowicz, B. A.; Panning, M.
Page Count	6
Abstract	Adequate path calibrations are crucial for improving the accuracy of seismic event location and origin time, size, and mechanism, as required for CTBT monitoring. There is considerable information on structure in broadband seismograms that is currently not fully utilized. The limitations have been largely theoretical. the development and application to solid earth problems of powerful numerical techniques, such as the Spectral Element Method (SEM), has opened a new era, and theoretically, it should be possible to compute the complete predicted wavefield accurately without any restrictions on the strength or spatial extent of heterogeneity. This approach requires considerable computational power, which is currently not fully reachable in practice. We propose an approach which relies on a cascade of increasingly accurate theoretical approximations for the computation of the seismic wavefield to develop a model of regional structure for the area of Eurasia located between longitudes of 30 and 150 degrees E, and latitudes of -10 to 60 degrees North.
Keywords	Seismic data Calibration Earth mantle Waveforms Eurasia Accuracy Sesimic waves Seismology Earthquakes Three dimensional Models Nuclear explosion detection Monitoring
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	National Nuclear Security Administration, Las Vegas, NV.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200608

Calibration of 3D Upper Mantle Structure in Eurasia Using Regional and Teleseismic Full Waveform Seismic Data. (Report for October 15, 2004-January 15, 2005).

Calibration of 3D Upper Mantle Structure in Eurasia Using Regional and Teleseismic Full Waveform Seismic Data. (Report for October 15, 2004-January 15, 2005).
DE2005838993

Publication Date	2005
Personal Author	Romanowicz, B. A.; Panning, M.
Page Count	6
Abstract	Adequate path calibrations are crucial for improving the accuracy of seismic event location and origin time, size, and mechanism, as required for CTBT monitoring. There is considerable information on structure in broadband seismograms that is currently not fully utilized. The limitations have been largely theoretical. the development and application to solid earth problems of powerful numerical techniques, such as the Spectral Element Method (SEM), has opened a new era, and theoretically, it should be possible to compute the complete predicted wavefield accurately without any restrictions on the strength or spatial extent of heterogeneity. This approach requires considerable computational power, which is currently not fully reachable in practice. We propose an approach which relies on a cascade of increasingly accurate theoretical approximations for the computation of the seismic wavefield to develop a model of regional structure for the area of Eurasia located between longitudes of 30 and 150 degrees E, and latitudes of -10 to 60 degrees North.
Keywords	Seismic data Calibration Earth mantle Waveforms Eurasia Accuracy Sesimic waves Seismology Earthquakes Three dimensional Models Nuclear explosion detection Monitoring
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	National Nuclear Security Administration, Las Vegas, NV.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200608