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Passive Source (SEED) Archiving Documentation

Main Documentation for PASSIVE Source Data Processing (SEED)

The documentation below offers instructions for archiving data from PASSCAL instrumentation in miniSEED format with metadata to be submitted as stationXML. To archive data from a PASSCAL experiment, select the appropriate documentation for your instrument for instructions for preparing the data before transferring it to PASSCAL. For the metadata, PASSCAL offers software for generating stationXML for your experiment. Please see the documentation for metadata generation using Nexus.

For PASSCAL PIs who previously archived data using Antelope, our documentation has been reworked to generate metadata in stationXML format via the PASSCAL program Nexus rather than using an Antelope database to create a dataless SEED. The documentation for archiving data with Antelope is still available on this page.

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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:

Differences between Flexible Array and PASSCAL Experiment when archiving

For Flexible Array experiments, the Data Group at IRIS/PASSCAL shares responsabilities with the Principal Investigator(s) for the archiving of their data as with PASSCAL experiments, however instead of the fully processed data in the required format (seed or hdf5) and dataless provided by PI on a PASSCAL Experiment, The PI and his team in a Flexible Array submit all the raw data and information needed to generate the metadata at PASSCAL.

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SEG-Y files produced from PH5 data sets


The SEG-Y file written by ph5toseg is in big endian byte order and attempts to follow the SEG-Y rev 1 standard (May 2002) as outlined in the table below.

The file does not contain a Tape Label.

SEG-Y: What is it?

The Society of Exploration Geophysicists Y Format, or SEG Y, has been the accepted exploration industry data format for digital seismic data since 1975.  Originally a magnetic tape-centric format, SEG Y has evolved over the years to remain the data format industry standard for data analysis and processing.  The latest revision (revision 1 .pdf format) to the format was released in 2002. 

What was the Data Archiving Workshop all about?

PASSCAL provides a valuable service to the scientific community by loaning seismometers, data recorders, and other equipment to professional researchers. After the hardware installation and recovery for each experiment, the raw data are harvested from every recording disk. Sometimes there are thousands of them. The raw files are gathered and converted into standard forms called SEED or ph5 formats. The final phase of the research process, which all our users consent to when they request our equipment, is the submission of their data results for archiving at the IRIS Data Management Center. It is not always a straightforward conversion, especially for new users and students. That's when the PASSCAL Data Group steps in to help.

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Workshop Agenda

PASSCAL Data Archiving Workshop San Francisco, California Gallery Room, Palomar Hotel December 13, 2009 Preliminary Agenda Agenda contents and schedule subject to change. updated 9/18/09

Morning Session: Passive-Source Processing and Data Archiving

PIC Workshop for Antelope and its Interfaces with Matlab and Python



Antelope Toolbox for Matlab (8MB) The Python Interface to Antelope (8MB) Automatic Event Location with Antelope (6MB) Generalized Event-driven Processing with Antelope (1MB) Seismic Array Processing with Antelope (1MB)

The motivation for this workshop was born in March of 2009 foreseeing the need for a broader understanding of antelope tools and its interfaces by PASSCAL staff and a group of researchers from New Mexico Tech (NMT).

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PH5 vs SEG-Y: Archival Data Format Comparison

PH5, clearly a better choice as an archival data format.


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