The bovine sound of earthquakes.
Pliny on earthquakes (Naturalis Historia 2.82): praecedit vero comitaturque terribilis sonus, alias murmuri similis, alias mugitibus aut clamori humano armorumve pulsantium fragori, pro qualitate materiae excipientis formaque vel cavernarum vel cuniculi, per quem meet Indeed, a terrifying noise goes before and along with it, sometimes a rumbling, sometimes like bellowing or human shouting or the […]
Also tagged Pliny, qualitas