Greenland Ice Cap Noise Studies Project Blue Ice

摘要

Seismic noise studies on the Greenland ice sheet were conducted as part of the VELA Uniform Basic Research Program under the code name Project Blue Ice. The station on the Ice Cap showed low-noise levels and low coherences between seismographs indicating that a large array would be an effective tool in detection. Emplacement of the seismometers in shallow holes eliminated the noise associated with high wind velocities. At the 50-percent probability of detection level, a single seismometer at the station has a detection capability of at least magnitude 4.3. The long-period noise levels were comparable with average sites on the continents. In addition to the major experiment, other scientific programs were conducted in the fields of glaciology, magnetics, gravity and air pollution. (Author)