admitted a series of emitted a series of low-pitched drum beats and rapid tremors which increased in frequency until the noise suddenly stopped just a minute or so before the volcano blew its top. here s what it sounds like sped up, scientists call it a volcanic scream. hear that? seismologist john ebel is director of the western observatory at boston college. this scream, it s only been te texted at this sol cato, right? is that because they weren t looking for it elsewhere or because it s the only volcano known to scream? well, actually, versions of this phenomenon where you see increases in earthquake activity and an amplification of the