Probing the Atmosphere and Atmospheric Sources with the USArray

Probing the Atmosphere and Atmospheric Sources with the USArray All branches from this event recorded by seismic stations and the infrasound array I56US. Symbols are scaled by SNR and colored by azimuith from the source. Signals from the lone infrasound array near the source are represented by the blue squares at 300 km.
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The USArray is designed to image the subsurface structure of the United States with exceptional resolution at a continental scale and for studies of regional and teleseismic earthquakes. Although the sensors of this network directly measure ground motion, they indirectly measure other phenomena that affect ground motion. It has been known for a long time that infrasound can be detected by seismometers through acoustic-to-seismic conversion at the ground/atmosphere interface. The USArray data archive contains recordings of several hundred large atmospheric events. One example is a bolide that burst above Oregon State on February 19, 2008 and was recorded by several hundred seismic stations and four infrasound arrays. The bolide source parameters were precisely determined by the seismic data, and the time-offset records show several phase branches corresponding to multiple arrivals. Such branches have never before been observed in such spectacular detail because infrasound arrays separated by thousands of kilometers are typically used for infrasound studies. The branches from such a large number of events occurring through the year are proving to be very useful for study of infrasound propagation and atmospheric structure.
</p><p>Acknowledgements: We would like to acknowledge Earthscope and IRIS for data from the USArray without which this study would not have been possible. We would like to thank Matt Fouch at the University of Arizona and David James at the Carnegie Institution of Washington for giving us access to data from their High Lava Plains Seismic Experiment. We would also like to thank Gene Humphries at the University of Oregon for giving us access to data from the Wallowa Flexible Array Experiment. This article was made possible through support provided by US Army Space and Missile Defense Command. The opinions expressed herein are those of the authors and do not necessarily reflect the views of the US Army Space and Missile Defense Command.</p>

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