首页|Probing signals of atmospheric gravity waves excited by the July 29,2021 Mw8.2 Alaska earthquake

Probing signals of atmospheric gravity waves excited by the July 29,2021 Mw8.2 Alaska earthquake

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
It is commonly believed that the atmosphere is decoupled from the solid Earth.Thus,it is difficult for the seismic wave energy inside the Earth to propagate into the atmosphere,and atmospheric pressure wave signals excited by earthquakes are unlikely to exist in atmospheric observations.An increasing number of studies have shown that earthquakes,volcanoes,and tsunamis can perturb the Earth's atmosphere due to various coupling effects.However,the observations mainly focus on acoustic waves with periods of less than 10 min and inertial gravity waves with periods of greater than 1 h.There are almost no clear observations of gravity waves that coincide with observations of low-frequency signals of the Earth's free oscillation frequency band within 1 h.This paper investigates atmospheric gravity wave signals within 1 h of surface-atmosphere observations using the periodogram method based on seismometer and microbarometer observations from the global seismic network before and after the July 29,2021 Mw8.2 Alaska earthquake in the United States.The numerical results show that the atmospheric gravity wave signals with frequencies similar to those of the Earth's free oscillations 0S2 and 0T2 can be detected in the microbarometer observations.The results confirm the existence of atmospheric gravity waves,indicating that the atmosphere and the solid Earth are not decoupled within this frequency band and that seismic wave energy excited by earthquakes can propagate from the interior of the Earth to the atmosphere and enhance the atmospheric gravity wave signals within 1 h.

Atmospheric gravity modesAtmospheric gravity wavesAlaska earthquakeNormal modesCoupling of solid earth and atmosphere

Geng Zhang、Jianqiao Xu、Xiaodong Chen、Heping Sun、Lizhuo Gong

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State Key Laboratory of Geodesy and Earth's Dynamics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan,430077,China

University of Chinese Academy of Sciences,Beijing,100049,China

Strategic Priority Research Program of the Chinese Academy of SciencesNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaOpen Fund of Hubei Luojia LaboratoryOffshore International Science and Technology Cooperation Center of Frontier Technology of Geodesy(Germany)

XDB 410000004217410141974023S22H640201

2024

10.1016/j.geog.2023.10.001

大地测量与地球动力学(英文版)
中国地震局地震研究所

大地测量与地球动力学(英文版)

EI
影响因子：0.568
ISSN：1674-9847
年,卷(期)：2024.15(3)
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