1. SIG: Synthetic Seismogram Exchange Standards (formats & metadata) Is it time to establish exchange standards for synthetic seismograms? IRIS Annual Workshop 12 June 2004 David Okaya, USC Tim Ahern, IRIS Goal of SIG: initiate dialogue within IRIS community Recommendation: international effort to make a prototype

2. SIG: Synthetics Exchange Standards David OkayaWhy an Exchange Standard? Dogan SeberImportance of Metadata for Synthetics Linus KambBut we have a standard -- Can SEED support synthetics? Seiji TsuboiXML-SEED: its application to synthetic seismogram database Torild van EckFDSN perspective on synthetics Heiner IgelSPICE efforts on synthetics Discussion Discussion

3. Why an Exchange Standard? Archive and exchange between seismologists, geoscientists Archive and exchange between seismologists, geoscientists and (civil/earthquake) engineers. Interoperatbility with upcoming digital and information technologies: Interoperatbility with upcoming digital and information technologies: - digital libraries. - interdisciplinary cross-correlations. - data and metadata searching, mining (KR&R). - visualization methods from Computer Sciences. NSF-Cyberinfrastructure (e.g., GEON, SCEC/ITR); NSF-Cyberinfrastructure (e.g., GEON, SCEC/ITR); international efforts such as SPICE.

4. Characteristics of Synthetic Seismograms As simple as single station 1- or 3-component seismograms (1D). As simple as single station 1- or 3-component seismograms (1D). Linear or spatial arrays of seismograms (2D to 3D). Linear or spatial arrays of seismograms (2D to 3D). Wavefront snapshot volumes (3D) over time (4D for movies). Wavefront snapshot volumes (3D) over time (4D for movies). Volumes:# nodes / dim. Volumes:# nodes / dim. # dimensions # components Kb - Mb Mb - Gb 100's Mb - Gb - Terabytes

5. What Exists Now? Traditional: SAC, AH, SEGY, CSS, ascii, raw binary, + readme Traditional: SAC, AH, SEGY, CSS, ascii, raw binary, + readme Other forms: e.g., netCDF Other forms: e.g., netCDF pros: known formats, familiar to communities, translators exist. cons: limited metadata, limited use for 3D/4D. SEED/miniSEED SEED/miniSEED pros: infrastructure already exists for archive/distribution translators, utilities. cons: lacks familiarity within synthetics community; needs alteration for higher D and metadata. pros: established use within other natural sciences & engineering; useful for computer interoperatbility. cons: "non-seismological"; little opportunity to adjust.

6. What Do We Need? Can be more than one format (based on dimensionality) Can be more than one format (based on dimensionality) - one for single station or limited set of seismograms. - another for large volumes (x-y-t; x-y-z, x-y-z-t) (may want to "object"-ify large blocks of synthetic data. Metadata Metadata - waveform or snapshot volume information (readme info). - algorithm, code version, authorship. - provenance (computation history). Usage Usage - easy to convert into from native code format. - translators need to exist or easy to create (by coding). - metadata tools to create and import values (within codes).

7. Example: SCEC/ITR Use of Synthetics SCEC/ITR is a $10M / 5-year Information Technology project. SCEC/ITR is a $10M / 5-year Information Technology project. Collaboration between SCEC, USGS, IRIS, with SDSC, ISI. Collaboration between SCEC, USGS, IRIS, with SDSC, ISI. PIs: T. Jordan, J.B. Minster, R. Moore, C. Kesselman. "Community Modeling Environment" (CME): "Community Modeling Environment" (CME): - Develop for broad audience an integrated information infrastructure for earthquake science. - Grid computing, digital libraries, KR&R, visualization. Role of Synthetics: Role of Synthetics: - Physics-based simulation of ground motion for seismic hazard analysis. - Takes into account wave propagation through 3D structure, source dynamics, and (non)-linear site effects.

8. Pathway Instantiations Knowledge Base Ontologies Curated taxonomies, Relations & constraints Pathway Models Pathway templates, Models of simulation codes Code Repositories Data & Simulation Products Data Collections FSM RDM AWM SRM Storage GRID Pathway Execution Policy, Data ingest, Repository access Grid Services Compute & storage management, Security DIGITAL LIBRARIES Navigation & Queries Versioning, Topic maps Mediated Collections Federated access KNOWLEDGE ACQUISITION Acquisition Interfaces Dialog planning, Pathway construction strategies Pathway Assembly Template instantiation, Resource selection, Constraint checking KNOWLEDGE REPRESENTATION & REASONING Knowledge Server Knowledge base access, Inference Translation Services Syntactic & semantic translation Computing Users SCEC/ITR Community Modeling Environment

9. Pathway Instantiations Knowledge Base Ontologies Curated taxonomies, Relations & constraints Pathway Models Pathway templates, Models of simulation codes Code Repositories Data & Simulation Products Data Collections FSM RDM AWM SRM Storage GRID Pathway Execution Policy, Data ingest, Repository access Grid Services Compute & storage management, Security DIGITAL LIBRARIES Navigation & Queries Versioning, Topic maps Mediated Collections Federated access KNOWLEDGE ACQUISITION Acquisition Interfaces Dialog planning, Pathway construction strategies Pathway Assembly Template instantiation, Resource selection, Constraint checking KNOWLEDGE REPRESENTATION & REASONING Knowledge Server Knowledge base access, Inference Translation Services Syntactic & semantic translation Computing Users FD/FE Inputs, Velocities, Code User Choices ComputationCuration Derived Products KNOWLEDGE ACQUISITION Acquisition Interfaces Dialog planning, Pathway construction strategies Pathway Assembly Template instantiation, Resource selection, Constraint checking GRID Pathway Execution Policy, Data ingest, Repository access Grid Services Compute & storage management, Security DIGITAL LIBRARIES Navigation & Queries Versioning, Topic maps Mediated Collections Federated access

10. Do We Need a Standard? For individual work, not necessarily. For individual work, not necessarily. Useful for exchange among seismologists. Useful for exchange among seismologists. Essential for IT interoperability. Essential for IT interoperability. Suggestion: Develop a Prototype Standard Establish a small international working group to: Establish a small international working group to: - define a strawman prototype. - examine the issue of what metadata are needed. - put under umbrella of FDSN (a la SEED). - Volunteers?

11. SIG: Synthetics Exchange Standards David OkayaWhy an Exchange Standard? Dogan SeberImportance of Metadata for Synthetics Linus KambBut we have a standard -- Can SEED support synthetics? Seiji TsuboiXML-SEED: its application to synthetic seismogram database Torild van EckFDSN perspective on synthetics Heiner IgelSPICE efforts on synthetics Discussion Discussion