Air pressure waves from Mount St. Helens eruptions

Details Air pressure waves from Mount St. Helens eruptions Air pressure waves from Mount St. Helens eruptions

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9211979r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Oct. 20, 1987, p. 11979-11992.

Physics

10

Detonation Waves, Explosions, Volcanoes, Air Flow, Atmospheric Refraction, Blasts, Compressed Air, Damage Assessment, Infrasonic Frequencies, Trees (Plants), Tungusk Meteorite, Wave Propagation

Scientific paper

Infrasonic recordings of the pressure wave from the Mount St. Helens (MSH) eruption on May 18, 1980, together with the weather station barograph records were used to estimate an equivalent explosion airblast yield for this eruption. Pressure wave amplitudes versus distance patterns were found to be comparable with patterns found for a small-scale nuclear explosion, the Krakatoa eruption, and the Tunguska comet impact, indicating that the MSH wave came from an explosion equivalent of about 5 megatons of TNT. The peculiar audibility pattern reported, with the blast being heard only at ranges beyond about 100 km, is explained by consideration of finite-amplitude shock propagation developments.

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