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PASSCAL pre-AGU Workshop

PASSCAL Workshop: Data Archiving and More!

Sunday, December 13, 2015
San Francisco - Zelos Hotel

Presentations are now online!  All are PDFs and the PH5 posters are a .gif and a .pdf

Session 1 - SEED Data Archiving

Session 2 - Instrument Responses (given by Mary Templeton of the IRIS DMC)

Session 3 - PH5 tools and future plans

PH5 poster from AGU 2013

Frequently Asked Questions Regarding Data Requests from PH5 Data Sets

Here are frequently asked questions regarding data requests from PH5 data sets archived at the IRIS DMC.  The answers are based upon the perspective the user is at the Data Request Form, which is available for each PH5 data set via its "Request" link found on the PH5 data set web page of the IRIS DMC website.

1. How do I select the length of the record?

Related categories:

PASSCAL SEG-Y Trace Header

 PASSCAL SEG-Y utilizes big endian byte order and sets the various trace headers as outlined below.

 

PASSCAL SEG-Y Trace Header

 

Controlled Sources

The Propelled Energy Generator, model: PEG-40Kg

Currently, the only controlled active source available from PASSCAL is the PEG 40Kg Propelled Energy Generator, manufactured by R.T. Clark Companies, Inc. PASSCAL has purchased its first fully automated PEG-40Kg system in 2011. The system is light weight, and highly portable, and is designed to easily mount onto a truck or SUV hitch. Seismic energy is produced when  a large hammer mass weight is propelled by an elastomer band (i.e. a very large rubber band) onto an impact plate, producing an impact frequency range of 10-250Hz. The source is controlled with a hand held motor controller,  and can operate in single cycle or continuous cycle mode. The device is powered by a 12V large capacity battery (car battery).  The PEG-40Kg was received, assembled, and field-tested by  PASSCAL staff on June 23rd-28th, 2011.

Data Archiving - General Data Flow

   

Data Archiving is a Collaborative Effort

        General flow of data from the field to the IRIS DMC, regardless of source or data format type.  The colors blue and orange illustrate the responsible party for each segment of the flow, the Principle Investigator or PASSCAL, respectively. 

 

PH5 Data Flow

PH5 data flow. The left column shows the general process one follows during the preparation of a PH5 data set.  The right side shows the various software tools and files necessary to complete the process.

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Archival and Analysis Formats - All about PH5 and SEG-Y

  New to active source data archiving?

Here you will find information describing active source data formats: PH5, recommended for archiving data and SEG-Y, required by the user community for analysis and research.

 

Related categories:

PH5: What is it?

 

 

PH5 is the recommended archival format for active source data sets.  PASSCAL has transitioned from SEG-Y to PH5, PASSCAL's implementation of the hierarchical data format, version 5 (HDF5) data model, as the preferred archival format for active source data sets.  The strengths of HDF5 made it an attractive model for an active source archival data format.

HDF5:

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Documentation - How to Archive your Active Source Data

Refer to the documentations below to learn how to prepare the data you've collected for archiving.  PASSCAL supports PH5 and SEGY as the archival data formats of active-source data sets.

If you have your data in SEG-2 format and do not have tools to convert them into SEG-Y, we can provide you with the SPW software for conversion (Please contact Data Group for details).

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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.

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