Last updated on April 18, 2014 at 17:24 EDT
Incorporated Research Institutions for Seismology Image 2
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Incorporated Research Institutions for Seismology (Image 2)

July 2, 2010
Incorporated Research Institutions for Seismology (Image 2) A map of the Incorporated Research Institutions for Seismology (IRIS) Consortium Global Seismographic Network (GSN) stations used by the Pacific Tsunami Warning Center during the 2004 Indian Ocean tsunami. The map is centered on Sumatra, with tsunami one-hour isochrones (yellow contours). Stations marked with white stars were available in real-time; pink stars indicate GSN stations with no--or delayed--telemetry. Seismic travel times to GSN stations--travel paths are marked with blue lines--were somewhere between 3 and 15 minutes for the stations shown. Therefore, the map indicates that the seismic energy greatly outpaced the Indian Ocean tsunami wavefront of Dec. 26, 2004. The goal of GSN--one of the four major components of IRIS--is to deploy and maintain over 128 permanent seismic recording stations uniformly over the earth's surface. IRIS is a university research consortium dedicated to exploring the Earth's interior through the collection and distribution of seismographic data. IRIS programs contribute to scholarly research, education, earthquake hazard mitigation and the verification of a Comprehensive Test Ban Treaty. Support for IRIS comes from the National Science Foundation and other federal agencies, universities and private foundations. For more information, visit the IRIS Web site, Here. [Research supported by National Science Foundation grants EAR 00-04370 and EAR 05-52316.] (Date of Image: 2006) [Image 2 of 4 related images. See Image 3.]