S53A-2770
On-Demand Synthetic Seismograms and Other Data Products at the IRIS DMC

Friday, 18 December 2015
Poster Hall (Moscone South)
Alexander R Hutko1, Chad M Trabant2, Robert T Weekly3, Manoch Bahavar1, Lion Krischer4, Martin van Driel5 and Tarje Nissen-Meyer6, (1)IRIS Data Management System, Seattle, WA, United States, (2)Incorporated Research Institutions for Seismology, Seattle, WA, United States, (3)Incorporated Research Institutions for Seismology, Data Management Center, Seattle, WA, United States, (4)Ludwig Maximilians University of Munich, Munich, Germany, (5)ETH Zurich, Department of Earth Sciences, Zurich, Switzerland, (6)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Abstract:
The IRIS Data Management Center (DMC) has served waveform data to the seismology community for over 25 years. This presentation highlights a new, on-demand synthetic seismogram service that will complement the time series data we have traditionally distributed. The synthetics are accessible using a straightforward web service that returns synthetics according to specified source-receiver combinations, Earth model and signal band. This new service is designed to generate synthetic seismograms extremely fast, making it feasible to request large numbers of synthetics. This capability supports studying variations in source properties, Earth models or temporal changes in instrument responses. Our collaborators have computed a global-scale database of Green's functions from which users can request synthetic seismograms for arbitrary source and receiver parameters and Earth models. This multi-terabyte database of Green's functions is computed using the spectral-element method AxiSEM (www.axisem.info) for selected common spherically symmetric Earth models (PREM, IASP91, AK135f...) with anisotropy and attenuation. Fine-scale models have resolution from 1 to about 100 sec periods with durations of 30 minutes; lower resolution models extend to a few hours duration. Behind the scenes, the web service runs Instaseis (www.instaseis.net), a system that rapidly calculates broadband synthetic seismograms from the pre-calculated Green’s function. The service also provides post-processing methods, including convolution with a specified moment tensor (or GCMT id) and one of a few source-time functions with variable duration. The interface is designed to be callable by user-friendly scripts and to support automated processing workflows. The DMC will also provide a command line script to download selections of synthetics. This new dataset and related service provide a powerful tool in multiple research areas where synthetic seismograms are useful. In this presentation, we will also highlight other new IRIS DMC data products that have been recently released or are in development.
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