Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3519302m&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 19, CiteID L19302
Physics
9
Seismology: Volcano Seismology (8419), Volcanology: Volcano Monitoring (7280), Hydrology: Debris Flow And Landslides, Atmospheric Composition And Structure: Instruments And Techniques
Scientific paper
On 29 May 2006 a large rockfall off the Mount St. Helens lava dome produced an atmospheric plume that was reported by airplane pilots to have risen to 6,000 m above sea level and interpreted to be a result of an explosive event. However, subsequent field reconnaissance found no evidence of a ballistic field, indicating that there was no explosive component. The rockfall produced complex seismic and infrasonic signals, with the latter recorded at sites 0.6 and 13.4 km from the source. An unusual, very long-period (50 s) infrasonic signal was recorded, a signal we model as the result of air displacement. Two high-frequency infrasonic signals are inferred to result from the initial contact of a rock slab with the ground and from interaction of displaced air with a depression at the base of the active lava dome.
Bowers David
Garces Milton A.
Hedlin Michael A. H.
Matoza Robin S.
Moran S. C.
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