<p>Ambient seismic noise characteristics at high-latitudes in Alaska are significantly influenced by natural factors and human activities. This paper analyzes the spatial and temporal distribution of noise and its influencing factors based on 2018 vertical component waveform data from five stations of the Alaska Earthquake Center's AK network. It is shown that the microseismic band noise at coastal stations ANM and TNA increases in intensity and shifts to shorter periods in summer and fall, while inland stations COLD, MLY, and RDOG show stable dual-frequency peaks and the highest intensity in winter. Among the natural factors, wave activity is the main source of noise at coastal stations, and its microseismic noise is significantly and positively correlated with the regional mean wave height (correlation coefficient r &gt; 0.7); river turbulence has a significant effect on the short-period noise at inland stations, which is more prominent in summer. Human activities mainly affect the short-period band noise, e.g., the short-period noise at COLD station shows daily variation with traffic activities, the noise at RDOG station is significantly enhanced by the impact of mining operations, and ANM and TNA stations are disturbed by the surrounding human activities. This study reveals the spatial and temporal variations of ambient seismic noise in high-latitude areas and the influencing factors, which provides an important reference for seismic monitoring and environmental noise research.</p>

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Characterization of ambient seismic noise in Alaska

  • Xiaochuan Zhu,
  • Lei Xing,
  • Qianqian Li,
  • Hongmao Zhang

摘要

Ambient seismic noise characteristics at high-latitudes in Alaska are significantly influenced by natural factors and human activities. This paper analyzes the spatial and temporal distribution of noise and its influencing factors based on 2018 vertical component waveform data from five stations of the Alaska Earthquake Center's AK network. It is shown that the microseismic band noise at coastal stations ANM and TNA increases in intensity and shifts to shorter periods in summer and fall, while inland stations COLD, MLY, and RDOG show stable dual-frequency peaks and the highest intensity in winter. Among the natural factors, wave activity is the main source of noise at coastal stations, and its microseismic noise is significantly and positively correlated with the regional mean wave height (correlation coefficient r > 0.7); river turbulence has a significant effect on the short-period noise at inland stations, which is more prominent in summer. Human activities mainly affect the short-period band noise, e.g., the short-period noise at COLD station shows daily variation with traffic activities, the noise at RDOG station is significantly enhanced by the impact of mining operations, and ANM and TNA stations are disturbed by the surrounding human activities. This study reveals the spatial and temporal variations of ambient seismic noise in high-latitude areas and the influencing factors, which provides an important reference for seismic monitoring and environmental noise research.