HR: 1340h
AN: S33B-0320    [Abstracts]
TI: An Assessment of the Accuracy of GSN Sensor Response Information
AU: * Davis, J P
EM: pdavis@ucsd.edu
AF: University of California, San Diego, 9500 Gilman Drive # 0225, La Jolla, CA 92093-0225 United States
AU: Ishii, M
S33B-0320 AF: University of California, San Diego, 9500 Gilman Drive # 0225, La Jolla, CA 92093-0225 United States
AU: Masters, G
S33B-0320 AF: University of California, San Diego, 9500 Gilman Drive # 0225, La Jolla, CA 92093-0225 United States
AB: The Sumatra-Andaman earthquake of December 26, 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 degree 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 the radial mode 0S0, which is predicted to be uniform globally, by using two different techniques. We find that the amount of scatter in the amplitude observations at GSN stations suggests that the goal of 1% accuracy has not yet been achieved.
DE: 7255 Surface waves and free oscillations
DE: 7294 Seismic instruments and networks (0935, 3025)
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: Fall Meeting 2005