The ultimate source for all IRIS data is, of course, the IRIS Data Management System. This page highlights a few of the pages available through the DMS that are specific to the GSN to assist in finding data, metadata, and quality assessments of the GSN data set.
Networks: The IRIS Data Management Center (DMC) maintains a list of all FDSN network codes describing the various contributing seismographic networks from around the world. In addition, the DMC has grouped associated stations together in Virtual Networks. The GSN Virtual Network is identified as "_GSN" (note the essential underscore character) and this contains all the subnetworks and stations that comprise the GSN.
SeismiQuery: Pre-formatted DMC database queries.
QUACK: Quality Analysis Control Kit (QC tools).
Wilber: Event viewer for FARM and SPYDER data.
LDEO Waveform Quality Center: Data quality assessment of the GSN and other large network data.