SOSA: An application for the analysis of synthetic and observed seismograms

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SOSA An application for the analysis of
synthetic and observed seismograms

• Joanna Muench (IRIS), Philip Maechling (USC),
  Linus Kamb (IRIS) and Tim Ahern (IRIS)

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Introduction

• The problem Comparing synthetic to observed
  seismograms requires many tools
• Retrieve observed from data centers and convert.
• Retrieve synthetics locally or from SRB and
  convert.
• Run processing routines, sometime different
  packages.
• No record of source of data or processing steps
  applied.
• The solution Synthetic and Observed Seismogram
  Analysis (SOSA)
• Provides single interface for retrieval of
  synthetic and observed seismograms.
• Has many common analysis routines, and ability
  to import custom defined processes.
• Automatically generates metadata with data source
  and processes applied.

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Retrieval

• Observed seismograms
• SOSA communicates with data centers via a Data
  Handling Interface (DHI).
• DHI installed at four major data centers,
  including SCEDC and IRIS DMC.
• Links search results to related simulations.
• Synthetic seismograms
• Accesses simulation stored in SRB via DDDS
• Retrieves seismograms with simulation metadata.
• Local files
• Current support SAC and mSEED file formats.

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Observed Seismograms - Events
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Observed Seismograms - Channels
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Observed seismograms
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Analysis

• Observed and synthetic seismograms treated
  identically.
• Provide support for basic analysis routines
• Resampling, filtering, rotation, convolution,
  correlation, etc.
• Results appear in new window, allows
  backtracking.
• Processed seismograms can be saved with metadata
  detailing the processing steps and original
  source of data.

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Processing
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SOSA and distributed computing
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Status

• Currently released at version 1.1
• Next version will be part of web services
  initiative
• Likely to exist as web portlet