Growing importance of metadata for synthetics: Calculating and

Sharing Synthetic Seismic Data

Dogan SeberUniversity of California, San DiegoSan Diego Supercomputer Center

Metadata: Two definitions

• Used to refer to “attributes in data sets”

• Used as “data about data: archival information for a data set following a certain standard (e.g, Dublin Core, FGDC)”

Challenges faced in a community-based synthetic seismogram calculations and exchange

• Inaccessibility of software

• Complexity of software

• Lack of computational resources

• Lack of reliable high resolution earth models

• Lack of data exchange standards and metadata

What IT could offer …

• The Grid– Distributed computing environment (e.g., TeraGrid)– Seamless access to distributed data resources (e.g.,

GEON)

• Service-based architecture design (e.g., Web services)

• Metadata (in XML format?)– Attribute level– Archival/Librarian level

An Example from GEON

• Grid-enabled synthetic seismogram calculation system for research and education– In collaboration with LLNL (Bill Glassley and

Shawn Larsen)– Service-based access to resources and data – Sharable control files for reproducible

calculations– Long term archival of results

3D Seismic Wave Propagation3D Seismic Wave Propagation

IRIS•Earthquakes•Stations•Waveform

Digital Libraries/GEON Data Grid

Earth model

Earth modelEarth

model

HPCHPCCentersCenters

LLNLLLNL SDSCSDSC

Gsate3d

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Modeling earthquake recordings in Modeling earthquake recordings in 2D/3D environment to study the interior 2D/3D environment to study the interior of the Earthof the Earth