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Here are some of the articles that have been recently posted to the PASSCAL website:

PASSCAL supports Salton Seismic Imaging Project (SSIP)

Six PASSCAL staff members were in Southern California this March to support the Salton Seismic Imaging Project (SSIP).  The project is funded by NSF through both the MARGINS Program (now GeoPRISMS) and the EarthScope Program, and funded by the U. S. Geological Survey through the Multi-Hazards Demonstration Project.  The project includes researchers from Virginia Tech, Caltech, the USGS, and Mexican partner institutions CICESE and UABC, Mexicali.

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Community Broadband Sensor Repair Policy

ver. 2011093

The PASSCAL Instrument Center (PIC) has historically honored requests to repair community owned broadband seismometers. Significant resources are required to process, evaluate, and repair a broadband instrument. To ensure that we are able to properly administer these requests and that we are offering these services consistently to all members of the IRIS community, the following policy will govern the PASSCAL Instrument Center's handling of these requests.

Trillium Releases Updated Response Files for Trillium 120 and 240

Nanometrics Inc., manufacturer of the Trillium series of broadband sensors, has recently updated the response for Trillium models 120 and 240.

PASSCAL provides these new response files for Antelope in our FTP download area.

A new posting, "Updated Instrument Response for Trillium_120, Trillium_240 (2 Generations) and Taurus", provides information and links to Antelope response files; it is available here.

If you have questions about using these new response files, please contact pmiller [at] passcal [dot] nmt [dot] edu (Pnina Miller) of the Sensor Group.

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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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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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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: 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. 

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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PH5: Why Another Archival Data Format?

 

           

       The impetus to provide a new data format for archiving stems from the inherent limitations with respect to the use of SEG-Y as a data archiving format, limitations such as: requiring vetted meta-data prior to converting the data into SEG-Y files, un-editable meta-data within the file, and inflexible, static data gathers.