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

IRIS/PASSCAL profiled in the Socorro Newspaper


The August 16th, 2018 edition of Socorro's El Defensor Chieftain featured a cover story describing the IRIS/PASSCAL Instrument Center located at New Mexico Tech. Reporter John Larson's piece says "Tucked away on a hilltop in the backyard of Tech’s campus is the Incorporated Research Institutions for Seismology Portable Array Seismic Studies of the Continental Lithosphere Instrument Center – IRIS/PASSCAL for short – the largest facility of its kind in the world. 

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All-In-One Systems

All-In-One systems combine seismic sensors with their dataloggers in a single, easily-deployed unit. Because these units do not require numerous cables to connect a sensor to its datalogger, they avoid many serious problems associated with cables, such as incorrect connector types, broken and chewed wires, or damaged pins. They are also much easier to deploy than conventional sensor/datalogger combinations. Their use can dramatically cut down on both station installation times and the number of required personnel. Their smaller size can also be very beneficial for deployments using volume-limited transportation methods, such as sea vessels.

Because Nodes and SmartSolos both utilize lithium batteries that operate above the 100Wh threshold, shipping of more than 2 units produced by either vendor will require special handling, including: packing, marking and documentation. Special handling, if needed, will require the assistance of a certified dangerous goods shipper.

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Experiments using IRIS/PASSCAL Nodes

To view PASSCAL supported experiments using nodes, please visit the schedule calendar. Once there, select the date range of interest,  "Nodes (3 Channel)" as the instrument type, and then click "Fetch the Calendar" to browse the schedule.

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The Geophysical Earth Observatory for Ice-Covered Environments (GEOICE) project was a NSF collaborative Major Research Instrumentation (MRI) program that expanded the PASSCAL Polar group’s observational capabilities and logistical efficiencies. GEOICE developed a rapidly deployable, dense footprint seismic observatory system for operation in ice-covered areas. The GEOICE project was a collaborative effort between Central Washington University (CWU), Incorporated Research Institutions for Seismology (IRIS) and the Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL) Instrument Center at the New Mexico Institute of Mining and Technology.

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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