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Constraining eruption processes for New Zealand volcanic systems

Event Type: 
Event Date: 
14 Mar 2017
EOS Seminar Room - N2-01B-28
Arthur Jolly
About the speaker: 

Dr. Jolly has worked in volcanology since 1990 when he was first employed as a USGS volcano seismic analyst during the 1989-1990 Redoubt and 1991 Spurr Alaska volcano eruptions.  He subsequently worked for the Alaska Volcano Observatory and studied for his Ph.D. with advisors Steve McNutt and John Eichelberger at the University of Alaska Fairbanks. After completion of this Ph.D. Dr. Jolly worked for the British Geological Survey and at the University of Leeds with Jurgen Neuberg and conducted monitoring and research on the Soufriere Hills volcano in Montserrat.  Dr. Jolly is presently employed with GNS Science in Wellington New Zealand and has research interests in volcanic source processes, eruption processes and volcano geophysics.

About the event: 

Volcanic eruptions comprise a range of explosivities, durations and sizes which depend on the underlying properties and processes of ascending magmatic fluids, their interaction with near surface hydrothermal systems and vent conditions at the time of eruption.  We examine several recent volcanic eruptions in the New Zealand/South Pacific region and attempt to constrain processes via seismo-acoustic data linked to video observations.  In addition to the natural examples, we will show a range of experiments which: 1) constrain the uncertainties associated with eruption energy release, 2) compare natural eruption observations to artificial eruption equivalents, and 3) attempt to densely observe the atmospheric focal sphere of natural repeating eruptions.  The results provide a framework to interpret the range of eruptive activity at such volcanoes using real time seismo-acoustic monitoring algorithms, even in the absence of visual information.