Nature of noises on ice sheet in East Antarctica

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概要

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• Two types of noise recorded in seismic explosion experiments around Syowa Station in Antarctica are discussed. One is wind-induced noise which is detected directly by a seismometer. This type of noise increases with a wind velocity, and when the wind velocity is over 15 m/s, seismic observations are not in success. With the object of noise reduction, seismometers buried in a hole at depths of 3, 5 and 10 m were examined, but the noise existed at 10 m. Seismometers should be buried deeper than 10 m. Another is electrostatic noise which frequently deranges a clock signal or destroys an electric circuit in the worst case. This noise is caused by drifting electrified snow, not by a seismometer itself. It was excited on a signal cable stretched on the snow surface from the seismometer to a recorder. To reduce this noise, the cable should be as short as possible and be laid in parallel with the direction of wind.

• 国立極地研究所の論文

著者

• Ikami Akira

  Rogional Center For Earthquake Prediction Observation School Of Science Nagoya University

• Ito Kiyoshi

  Rogional Observation Center for Earthquake Prediction,Faculty of Science,Kyoto University

• Ito Kiyoshi

  Rogional Observation Center For Earthquake Prediction Faculty Of Science Kyoto University

関連論文

• Deep crustal structure along the profile between Syowa and Mizuho Stations, East Antarctica
• Upper crustal structure beneath the Ongul Island, East Antarctica
• Upper crustal structure of the Prince Olav Coast, East Antarctica
• Amplitudes of seismic waves on ice sheet in East Antarctica
• Nature of noises on ice sheet in East Antarctica
• Velocity distribution on ice sheet in Prince Olav Coast, East Antarctica

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