Data Services Newsletter

Volume 12 : No 1 : Spring/Summer 2010

IRIS Hosts 2010 PQLX Workshop

Photos of Snowbird, UT
PQLX Workshop in Snowbird, UT. © 2008

The IRIS DMS will host a one day PQLX workshop on June 8, 2010 in Snowbird, Utah, just prior to the 2010 IRIS Workshop.

PQLX (PASSCAL Quick Look eXtended) is open-source software used to evaluate seismic station performance and data quality (see

It is intended to give both a general and broad overview of station/data quality as well as giving the user specific capabilities to determine when and where data quality issues arise. The software primarily consists of a server analysis program and client data visualizer, but also includes data extraction and migration tools. Given waveform data and instrument response files, the PQLX server computes trace statistics, Power Spectral Densities (PSD), and Probability Density Functions (PDF) and writes the results to a MySQL database for quick access by the client. PQLX is compatible with the Linux, Mac OSX, and Solaris operating systems. Supported waveform data formats are Mini-SEED, SAC, SEGY, AH, nano, and DR100; response files must be in SEED RESP file format.

This full-day workshop will provide a hand-on introduction to all aspects of the PQLX Seismological Analysis System. Participants are expected to bring a reasonably powerful laptop, one week to one month’s worth of data for at least three channels qualifying for PSD analysis (e.g., BH*, LH*, etc.), and response files (format produced by program rdseed) for each PSD-qualifying channel.


Participants MUST provide their own laptop with PQLX and MySQL preloaded.

See the workshop information page for more details.

More information

by Tim Ahern (IRIS Data Management Center)

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