Lava Lake Rose, Koto Poxy, Rico discussed on Science Friday

Science Friday


Maybe you can explain for our listeners a little bit more. What exactly we're listening to their mean? What what is it your your hearing in that sound that is meaningful to you? Well, we're listening to explosions recorded with infra sound, but sped up into the audible domain, and one thing you might have picked up is that the frequency content changed and at the same time, maybe a little bit more subtle the timber of the sounds changed. And so as this level is rising up within the crater, we're effectively shortening the tube of this acoustic Resonator, and that's creating these these higher frequency sounds our study from two thousand eighteen analyzed another aspect of sound. However, and that is this thing called the quality factor. The amount of residents that those sounds are exhibiting. In other words, in the early portion of the sequence this pipe was resonating very nicely almost like a musical instrument and towards the end of the sequences the level lake rose to within fifty meters of the crater rim. The resonance was gone. And it was just these explosions that sounded like thumps satellite thunk thunk because why? Well, volcanoes as musical instruments only works when the crater shape is of a certain form. And so in the case of via Rico, we had this giant shaft hundred fifty meters deep about sixty meters wide, and that was able to vary. Affectively trap acoustic residence that was awesome of air masses within the system. There was a large impede in contrast at the atmosphere crater interface as the lava lake rose, the sources that are occurring at the level surface are now being projected out into the atmosphere, and they're not being bounced back or reflected at that crater opening and has everything to do with the geometry or shape of that flaring, crater we have another recording here. This is a signal from an Ecuadorian of volcano called Koto poxy. Let's listen to that..

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