期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 12, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL093013
关键词
balloon; geophysics; infrasound; seismology; Venus
资金
- Strategic Research and Technology Development and the Instantaneous and Spontaneous Concept grants at the Jet Propulsion Laboratory (JPL)
- NASA Planetary Science and Technology through Analog Research (PSTAR) program
- W.M. Keck Institute for Space Studies
- National Aeronautics and Space Administration
- U.S. Department of Energy's National Nuclear Security Administration [DENA0003525]
By detecting an earthquake for the first time from a balloon-borne microbarometer, this study demonstrates that seismic activity can be detected from a high-altitude platform on Earth. It also shows that Rayleigh wave-induced infrasound can be used to constrain subsurface velocities, laying the groundwork for the detection and characterization of such signals on Venus.
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.
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