The Sumatra-Andaman earthquake of 26 December 2004 provides a special opportunity to validate the accuracy of sensor sensitivities reported for the IRIS Global Seismic Network (GSN). A goal of the GSN is to publish instrument responses to an accuracy of 1% in amplitude and 1° in phase. This earthquake excited long-period free oscillations such that modes with low decay rates could be observed above ambient noise for many weeks after the event. By examining the subset of modes least sensitive to short wavelength structure, one may test the reliability of published station response information. We investigate here the amplitude of...

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