HR: 08:30h
AN: SF31B-03 INVITED     [Abstracts]
TI: An XML-SEED Format for the Exchange of Synthetic Seismograms
AU: * Tsuboi, S
EM: tsuboi@jamstec.go.jp
AF: Institute For Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001 Japan
AU: Tromp, J
EM: jtromp@gps.caltech.edu
AF: Seismological Laboratory, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 United States
AU: Komatitsch, D
EM: dimitri.komatitsch@univ-pau.fr
AF: Universite de Pau et des Pays de l'Adour, Avenue de l'Universite, 64013 Pau, Cedex France
AB: We have demonstrated that we can calculate global theoretical seismograms for realistic 3D Earth models based upon the combination of a precise numerical technique (the spectral-element method) and a sufficiently fast supercomputer (the Earth Simulator) [Tsuboi et al, 2003]. It has now become possible to routinely calculate synthetic seismograms for earthquakes greater than a certain magnitude. We have started to create a synthetic seismogram database by using model S20RTS of the mantle (Ritsema et al., 1999), model CRUST2.0 of the crust (Basin et al., 2000), and topography and bathymetry model ETOPO5. The calculations are performed on 1944 processors, which require 243 out of 640 nodes of the Earth Simulator. Starting in 2003, we select earthquakes with magnitudes greater than 6.5 from the Harvard CMT catalog and calculate theoretical seismograms for the Stations in the Global Seismographic Network. To distribute this synthetic seismogram database to the seismological community, the data format of the seismograms becomes an issue because the SEED format, which is currently used for the exchange of broadband seismic data, does not have an entry for the metadata that characterize the theoretical seismograms. To overcome this problem, we extend the SEED format by using the eXtended Markup Language (XML) and propose this format as a possible standard for the exchange of theoretical seismograms. The representation of SEED volumes in XML has already been explored by the IFREE/JAMSTEC data center. We believe that the use of XML to extend the SEED format to accommodate the exchange of theoretical seismograms is promising because XML is easy to modify and is used as a basic protocol of network tools, such as Web services. We adopt this representation of SEED volumes in XML and extend it to include metadata entries for the theoretical seismogram database. The entries that we have added to this format uniquely characterize the simulation that was performed to create the synthetics. Currently, each data sample is represented by a character, but it should be possible to include binary formatted data, such as mini-SEED. We will soon distribute these theoretical seismograms through mirrored IFREE/JAMSTEC and Caltech web interfaces.
DE: 7260 Theory and modeling
DE: 8121 Dynamics, convection currents and mantle plumes
DE: 3210 Modeling
DE: 3220 Nonlinear dynamics
DE: 1510 Dynamo theories
SC: Special Focus: Advances in Data Acquisition, Management, Analysis and Display [SF]
MN: 2004 AGU Fall Meeting