Data from the Global Seismographic Network are the most widely accessed dataset in the IRIS Data Management System, with over 44 Terabytes (TB) of data shipped in 2006–2009, both in real time and from the archive (see figure). Over 11 TB were distributed in real time in 2009 by DMS. Nonetheless, GSN data are also distributed in real time to a broad spectrum of users separate from the DMS distribution.
Many networks or large data users access GSN data directly from USGS and UCSD data collection centers, via tsunami warning centers, through software operating at various seismic networks, or from the GSN station itself. These real-time users include USGS/NEIC, U.S. and international tsunami warning centers, Global CMT, CTBTO IMS, and national networks and organizations in Australia, Austria, Canada, Chile, China, Colombia, Czech Republic, Dominican Republic, El Lalvador, France, Germany, Guatemala, Hong Kong, Iceland, Indonesia, Italy, Japan, Kuwait, Malaysia, Mauritius, Mexico, Morocco, Netherlands, Puerto Rico, Nicaragua, Norway, Oman, Philippines, Romania, Russia, Singapore, Spain, Sweden, Taiwan, Thailand, Turkey, United Arab Emirates, United Kingdom, and 31 local station hosts, and others. Tracking the amount of data requires a certain amount of detective work and engagement in correspondence with international users.
An estimate of GSN real-time data usage not distributed by DMS is about 6.9 TB/yr, or about half of the DMS rate. This estimate does not count multiple uses of GSN data within an organization. The estimated total GSN real-time data usage rate (circa 2010) is therefore about 18 TB/year, compared with a nominal GSN data logger rate of about 1.1 TB/year.</p>


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