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Requirements for PASSCAL Passive Experiments (SEED)


Data and format for archiving

In order to accept your passive-source data for archiving please comply with the procedures and standards below. PASSCAL staff are available to assist you with meeting the requirements of archiving your SEED data as stated in the PASSCAL Data Delivery Policy

Regarding the archiving of SEED data, the policy may be summarized in three points:

  1. Data should be archived as soon as practical after data retrieval during service runs.
  2. The DMC will only allow access to the waveforms to the PI and others designated by the PI. Access will be by password that will be provided by the DMC to the PI. The PI can share the password with anyone he/she wishes. The PI will be notified when anyone registers for access to a proprietary dataset.
  3. For experiments with five or more stations, at least one station's data must be designated as unrestricted with respect to IRIS DMC data requests.  For more information regarding requesting restricted data sets please visit the DMC restricted data page.

To archive data in SEED you will need to request a temporary network code which will identify your experiment for the duration of your experiment. The request of the network code can be done through the PI web home at PASSCAL, once you have requested an account and logged in, you can access all current information about your experiment in the PASSCAL database, and you will be able to request a network code through the mobilization form (accessible via either the PI Home Page, or the Experiment's page).


Data Archiving  Responsibilities

Principal Investigator PASSCAL Shared
Acquire, reduce and QC metadata.
• Submit data and metadata to PASSCAL for quality control
before archiving with IRIS/DMC
• Maintain close communication on evolution of experiment and
data related issues until data fully archived.
Provide training when requested for data
• Provide Documentation with guidelines and requirements for
data archiving.
• Support PI/archiver while processing data for archiving
• Instruct PI/archiver on software needs for data processing
• Perform verification on data for proper archiving
• Archive and confirm data with DMC to assure completeness
Construct, verify, and archive SEED with the DMC.

What needs to be archived:

Please e-mail the data group for details when ready to submit your data: data_group [at] passcal [dot] nmt [dot] edu

Meta Data

  • The meta-data or information describing the instrumentation and site that recorded data must be appropriately defined within the dataless SEED volume
  • BRTT's Antelope software package is a convenient way to generate a dataless SEED volume and is the standard means by which individuals prepare PASSCAL experiment data for archiving.  The package allows you to completely describe typical PASSCAL-equipped stations with relative ease utilizing prepared sensor and datalogger information, leaving the site-specific meta-data to the user (e.g. latitude, longitude, elevation, site name, channel codes, channel orientations).  Note while BRTT supplies Antelope to US Education and Research Institutions with certain restrictions, PIs of PASSCAL experiments should coordinate with the data_group [at] passcal [dot] nmt [dot] edu (data group) regarding licensing and data archiving Antelope software support. 


All data for passive source usually gets archived in SEED format following defined procedures.

  • The SEED format data files are to be organized by station-channel-days for all waveform, state of health, mass position, administrative and log channels.  All data must be in big endian format.  For more details please e-mail data_group [at] passcal [dot] nmt [dot] edu and consult our documentation and Boulder Real Time Technology Inc. (BRTT) Antelope software for the specifics of how to achieve this format for all of your data.
  • A complete dataless is required that describes all data previously submitted as well as previously archived for this experiment. 
  • Both the data and the dataless will be submitted to PASSCAL via our data2passcal tool.  Please contact the data group before submitting any data.

After you have complied with these procedures and standards you may submit your data to PASSCAL for review (compliance with SEED format and conventions) and archiving at the IRIS DMC.

Last update: May 2, 2017