Noise Levels and Detection Thresholds at U.S. Seismological Stations during the GSETT and Noise Levels and Detection Thresholds at GSETT Seismological Stations

摘要

Seismic noise levels and detection thresholds for teleseismic short period P-waves and long period Rayleigh waves at U.S. seismological stations, and other stations, which participated in the Technical Test (GSETT) of the Ad Hoc Group of Scientific Experts are estimated. It is concluded that the GSETT stations constitute a global network with large variations in noise and detection characteristics among the individual stations. The median value of the m sub b detection threshold is 4.9. Most of the stations have a significantly higher detection capability for teleseismic short period P waves than for long period Rayleigh waves. The variation in short period detection capability among the stations is well over a magnitude unit, whereas the long period detection capability has less variation among the stations.