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

PASSCAL and EMRTC help BBC explain internal structure of Earth

In early May, a team from the British Broadcasting Corporation (BBC) visited New Mexico Tech to use school facilities to support a new documentary on the current state of knowledge about the Earth's core.  Since seismology is the only practical method for probing the Earth's core, the team arranged the support of two of New Mexico Tech's facilities, the Energetic Materials Research and Testing Center (EMRTC), and the Program for Array Seismic Studies of the Continental Lithosphere (PASSCAL), to demonstrate how the seismic waves from earthquakes or man-made explosions can travel through the Earth, and be used as a subsurface probing tool. The team was assisted by Dave Thomas and Mouse Reusch from PASSCAL, and Richard Aster from the NMT Earth and Environmental Science department.

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Visitors from Ecuador

Three engineers from the Escuela Politecnica Nacional Ecuador, Instituto Geofísico, spent the first two weeks of May here at PASSCAL. They are planning a network of 63 permanent broadband stations, 25 emergency sites, and 70 accelerometer stations in Ecuador. These stations will be used to monitor volcanic activity and seismic events. Ecuador is home to more than 20 volcanoes, so this is an important undertaking not only for the scientific knowledge it will provide, but also for the safety of the Ecuadoran people.

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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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.

Data from PH5 format data sets archived at the DMC can be accessed via PH5 Web Services.

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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.


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