Excitation process of infrasonic waves associated with Merapi-type pyroclastic flow as revealed by a new recording system

Details Excitation process of infrasonic waves associated with Merapi-type pyroclastic flow as revealed by a new recording system Excitation process of infrasonic waves associated with Merapi-type pyroclastic flow as revealed by a new recording system

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1099o&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 6, p. 1099-1102

Physics

7

Seismology: Volcano Seismology, Volcanology: Eruption Mechanisms, Volcanology: Eruption Monitoring, Volcanology: Instruments And Techniques

Scientific paper

We investigate excitation process of the infrasonic waves associated with Merapi-type pyroclastic flows at Unzen volcano, Japan, using data set obtained by a new system that permits recording of geophysical data with accompanying visual events on a single videotape. The accurate correlation of infrasonic waves with video images reveals that: (1) successive impulsive waves and the low-frequency wave (<~0.8Hz) are excited during the collapse of lava blocks falling from the dome, which generates a pyroclastic flow; (2) an impulsive wave is excited by an explosive blowout of the pore-gases which are released by the break-down of the falling blocks; (3) the low-frequency wave is excited by the volumetric change which results from expansion of the pore-gases released by pulverization of the falling blocks. The comparison between the observed and the synthetic low-frequency waves shows that the amount of volume change is about 2 times that of the initial falling blocks.

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