User login


PASSCAL Facility

The Incorporated Research Institutions for Seismology (IRIS) Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL) Instrument Center and EarthScope USArray Array Operations Facility (AOF) at New Mexico Tech support cutting-edge seismological research into Earth’s fundamental geological structure and processes. The facility provides instrumentation for National Science Foundation, Department of Energy, and otherwise funded seismological experiments around the world. PASSCAL experiment support includes seismic instrumentation, equipment maintenance, software, data archiving, training, logistics, and field installation.

Continued expansion of IRIS activities at New Mexico Tech via the EarthScope and other initiatives has spurred a major facility expansion, the EarthScope USArray Array Operations Facility. The AOF was officially dedicated on April 6, 2005 by the New Mexico Tech administration and the IRIS Board of Directors. The combined PASSCAL Instrument Center and AOF currently support a total of 33 professional New Mexico Tech staff, as well as a contingent of student workers.

PASSCAL and USArray Flexible Array equipment is available to any research or educational institution to use for research purposes within the guidelines of established policies. These policies provide that data collected with PASSCAL and/or USArray 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.

Recent News

Staff Scientist/Polar Projects Engineer

Staff Scientist/Polar Projects Field Engineer Revised: Feb 5, 2018


Job Duties:

The IRIS PASSCAL Instrument Center at New Mexico Tech is seeking applicants to fill the position of Staff Scientist/Polar Projects Field Engineer. The primary responsibility of this position is to support Polar research both from the lab and in the field. Duties include: testing, preparing, and shipping equipment; supporting field installations, maintenance, and decommissions in both in the Arctic and Antarctic; developing specialized equipment for cold, dark environments producing and maintaining documentation and web content related to Polar support and systems; and training member of PASSCAL’s user community.

Required Qualifications:

IRIS PASSCAL Data Policy Update

IRIS/PASSCAL has updated our Data Policy. The new Policy, which was published on November 1, 2017,  can be perused here. It details the archiving requirements for data collected with IRIS PASSCAL equipment through the PASSCAL Instrument Center (PIC)

"White Wanderer" Exhibit in Chicago joins Seismology and Art

An exhibit sponsored by the Natural Resources Defense Council has combined the work of University of Chicago seismological scientist Doug MacAyeal of with the art of Luftwerk, to produce an artistic rendition of the seismic "sounds" produced by climate change in the Antarctic. The exhibit opened with a live demonstration of seismic data acquisition, using instruments provided by IRIS/PASSCAL. The project was a collaboration with NRDC, with additional help from the University of Chicago, and was on display at Two Riverside Plaza, Chicago IL from Sept 7th – Oct 1st. 

December 31 2016 Leap Second

Leap Second's effect on PASSCAL RT-130 and Q330



Data time starting at 2017:001:00:00:00 is +1 second from truth for 1-2 minutes (seen in controlled tests) until a clock correction, followed by a gap of 2-40 seconds per channel depending on sample rate.


Data time starting at 2017:001:00:00:00 is +1 second from truth for 15min - 9:42hrs (seen in controlled tests) until a clock correction. Some data (~6secs in tests) around the time correction is mistimed, sometimes 11 years in the future, or missing.

Tutorial on PASSCAL's New Instrument Request Form and PI Home Page

In June 2016, PASSCAL implemented a new version of the Instrument Scheduling Database.

This tutorial shows Principal Investigators how to request an account, how to log in, how to use the PI Home Page, and how to submit a new and/or modify an existing Instrument Request.

Syndicate content