The loudest three sounds ever recorded , during the 1883 eruption of Krakatoa , are now understood as the bursts of three huge cavitation bubbles , each larger than the last , formed in the volcano 's throat . Rising magma , filled with dissolved gasses and under immense pressure , encountered a different magma that compressed easily , allowing bubbles to grow and combine . There exist macroscopic white lamellae inside quartz and other minerals in the Bohemian Massif and even at another places in whole of the world like wavefronts generated by a meteorite impact according to the Rajlich 's Hypothesis . The hypothetical wavefronts are composed of many microcavities . Their origin is seen in a physical phenomenon of ultrasonic cavitation , which is well known from the technical practice
1883 eruption of Krakatoa
1883 eruption of Krakatoa
Cavitation