TRAN QUANG HAI ‘s vocal experimentation about how to produce the earthquake sound after listening to the clip by the Patram Institute male choir in SATAROV , RUSSIA, 14/08/2020

WHEN NICHOLAS BANNAN FROM AUSTRALIA ASKED ME WHETHER THE MALE CHOIR OF THE PATRAM INSTITUTE IN SATAROV RUSSIA SUNG THE EARTHQUAKE SOUND WHICH CAN BE MODAL SINGING OR SUGHARMONIC, I SPEND A FEW HOURS TO LISTEN THE CLIP VERY CAREFULLY TRYING TO DISCOVER THE WAY THEY PRODUCED THE VERY LOW SOUND ; FINALLY ,THE RESULT OF MAKING THE SAME SOUND EFFECT WITH LOW SOUND. FIRST, I SANG THE NORMAL PITCH IN MEDIUM LEVAL WITH THE WORLD ” HOR” THEN I CHANGED TO THE WORD ” EE like BEE” in an octave lower than the first sound. The produced sound “EE” with the mouth half close, and the sound like you snore with the low vibration of the low sound creating the earthquake sound effect .This vocal production can be compared with the KARGYRAA Tuvin and Mongolian style, or the TIBETAN low sound chanting.
The vibration of the false vocal cords makes this kind of low sound . Do you think that it is subharmonic ? I am only the voice imitator.
Thank you Nicholas for offering me this occasion to practise my voice experimentation .
TRAN QIANG HAI (14/08/2020 , FRANCE)