[Eoas-seminar] Dr. Jonathan Lees' talks on Thursday and Friday

eoas-seminar at lists.fsu.edu eoas-seminar at lists.fsu.edu
Tue Jan 22 08:45:19 EST 2019

Hi all,

Prof. Jonathan Lees of the University of North Carolina at Chapel Hill will give two talks this week, 3:30-5:00 PM on Thursday afternoon at MET seminar series at LOV 353 and 3:30-5:00 PM on Friday afternoon at EOAS colloquium series at CAR 101. The titles and abstracts are in the following:

Thursday's talk, 3:30 PM, LOV 353

Infrasonic (Bal)Looney Tunes: Oceans-Atmospheres and Music of the Spheres


We present the first recording of ocean generated microbarom signals collected on a balloon borne station above a storm on in the Southern Ocean.  From May 15 to June 5, 2016, the NASA high altitude floating balloon platform completed a full circumnavigation of Antarctica.  Instrumentation on the platform included a pair of infrasound microphones recording at 100 sample/s.  During the flight the station hovered briefly over a storm that produced unusually high microbarom energy, based on Wave-Watch III models.  The confluence of the ocean storm and the stratospheric balloon platform is thus the most direct test of the Longuet-Higgins (1950) microseism source theory.  We present the analysis predicting transfer of energy from the ocean to the stratosphere and estimate heating of the thermosphere as a result of ocean wave interaction.  Beyond the low frequency recording of the microbarom, higher frequency signals include lightning strikes and possible bolide events.  These studies form the basis for extraterrestrial planetary exploration where installation of standard geophysical instrumentation, due to harsh conditions, is prohibitive.

Friday's talk, 3:30 PM, CAR 101

Boom-chugga-lugga on Exploding Volcanoes: Music of Kitchen Seismology


Harmonic tremor on exploding volcanoes has possibly numerous sources and physical explanations.  At several volcanoes, recordings of seismic and acoustic waves provide constraints on the dynamics and nature of resonating bodies that produce and propagate sounds and shaking observed remotely. Here observations of seismic and acoustic recordings, correlated to high resolution video reveal the rich content of volcanic tremor, sometimes mimicking musical instruments. This can be misleading and controversial, however. Models derived from seismo-acoustic observations are used to develop and constrain physical parameters associated with the internal dynamics of the conduit, multiphase fluid flow, and subsequent explosions. A comparison of explosions at Karymsky Volcano, Russia, and Santiaguito Volcano, Guatemala, illustrates differing examples of volcanic tremor and carapace explosivity.

Look forward to seeing you.


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