The First Detection of an Earthquake From a Balloon Using Its Acoustic Signature.
The First Detection of an Earthquake From a Balloon Using Its Acoustic Signature.
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DOI：
10.1029/2021gl093013
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发表时间：
2021-06-28
影响因子：
5.2
通讯作者：
Walsh GJ
中科院分区：
文献类型：
--
作者：
Brissaud Q;Krishnamoorthy S;Jackson JM;Bowman DC;Komjathy A;Cutts JA;Zhan Z;Pauken MT;Izraelevitz JS;Walsh GJ
金星表面的极端温度和压力条件给地面地震学研究带来了巨大的技术挑战。金星大气层和固体行星之间的有效耦合理论上允许在上层大气中使用气球研究地震产生的声波，那里的条件要恶劣得多。然而，从气球上探测地震从未被证实过。我们展示了2019年7月在加利福尼亚州里奇克莱斯特附近用气球载微型气压计首次探测到地震，并详细分析了从气球上测量到的地震次声对震源参数、地形、地壳和大气结构的依赖性。我们对地震声学现象学的综合分析表明，在地球上的高海拔平台上可以探测到地震活动，并且瑞利波诱导的次声可以用来限制地下速度，为在金星上探测和表征此类信号铺平了道路。瑞利波诱发次声频散特性提供了对次声速度的约束。浅波导、震源机制和亚波长地形变化控制着弱地震的次声振幅和频散
Extreme temperature and pressure conditions on the surface of Venus present formidable technological challenges against performing ground‐based seismology. Efficient coupling between the Venusian atmosphere and the solid planet theoretically allows the study of seismically generated acoustic waves using balloons in the upper atmosphere, where conditions are far more clement. However, earthquake detection from a balloon has never been demonstrated. We present the first detection of an earthquake from a balloon‐borne microbarometer near Ridgecrest, CA in July 2019 and include a detailed analysis of the dependence of seismic infrasound, as measured from a balloon on earthquake source parameters, topography, and crustal and atmospheric structure. Our comprehensive analysis of seismo‐acoustic phenomenology demonstrates that seismic activity is detectable from a high‐altitude platform on Earth, and that Rayleigh wave‐induced infrasound can be used to constrain subsurface velocities, paving the way for the detection and characterization of such signals on Venus. First detection of a natural earthquake using balloon‐borne infrasound data Rayleigh wave‐induced infrasound dispersion characteristics provide constraints on subsurface velocities Shallow waveguides, focal mechanism, and subwavelength topographic changes control infrasound amplitude and dispersion by weak earthquakes