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

PASSCAL's PASSOFT Software has been Updated

PASSCAL provides open-source software, PASSOFT, for downloading seismic data from data recorders, for quality assessment, and for conversion to other data formats for analysis and archiving at the IRIS Data Management Center. The latest version of PASSOFT is now available for general use. It is Python 3 compatible, and can be downloaded here.

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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.

Node Use Policy

PASSCAL Node Usage and Support Policy Version 1.0 2/27/2019 Introduction

This policy clarifies the responsibilities and support provided by the PASSCAL Instrument Center for node experiments utilizing the IRIS/PASSCAL node pool. The primary drivers behind this policy are as follows:

To clarify PASSCAL and the PI’s roles and responsibilities for nodal experiments

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2020 Polar Technology Conference coming in March

The 2020 Polar Technology Conference is planned for 10–12 March 2020 in Boulder, Colorado. This activity is a cooperative effort among the National Science Foundation’s Office of Polar Programs, the Arctic Research Consortium of the United States, and the polar research community.

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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?

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Acknowledgment, Citation, and Logos


In any publications or reports resulting from the use of these instruments, please include a statement in the acknowledgment section. You are also encouraged to acknowledge NSF and IRIS in any contacts with the news media or in general articles.

How to Cite IRIS in Your Publication

PASSCAL Program Citation

Aster, R., Beaudoin, B., Hole, J., Fouch, M., Fowler, J., and James, D., 2005, IRIS Seismology Program Marks 20 Years of Discovery, Eos Trans. AGU, 86(17), p. 171-172.



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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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Staff Directory

  USPS Address IRIS PASSCAL Instrument Center 801 Leroy Place New Mexico Tech Socorro, NM 87801   Shipping Address IRIS PASSCAL Instrument Center 100 East Rd. New Mexico Tech Socorro, NM 87801   Website Problems or Questions Please contact webmaster [at] passcal [dot] nmt [dot] edu (PASSCAL staff) regarding any website problems, questions, or suggestions.
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Borrowing Equipment

PASSCAL equipment is available to any research or educational institution to use for research purposes within the guidelines of established Governing Policies. These policies provide that data collected with PASSCAL equipment be archived at the IRIS Data Management Center and that the data are openly available to the community. Instruments can be requested online using the PASSCAL Instrument Request Forms.

Who Can Borrow Equipment

Instrument Use Policy

What is Required if You Borrow Equipment

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Ground Penetrating Radar (GPR) System

The IRIS Education and Public Outreach program acquired a Sensors and Software Noggin GPR System with SmartCart configuration to enhance the IRIS PASSCAL equipment pool (see image at left). The system has onboard GPS, data acquisition programming, and preliminary data interpretation capabilities. The system has both line-scan or grid-scan data collection modes. The onboard software allows for quick survey setup, on-the-go viewing of the waveforms collected, and initial waveform depth estimates. Processed onboard data can be visualized as depth versus position along a line, or as a slice view of grid data. The PASSCAL Instrument Center offers additional software for more in-depth post acquisition processing and interpretation of the data.

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