The natural vibration note of the earth a is E, but 20 octaves below middle E on a Piano. That is a viberation with a period of 54 minutes.
When a magnitude 9 earth quake occurs, the whole earth will reverberates detectably at that frequency for several years.
The entire reverbration from the 2004 Summatra earthquake was recorded by seismometers, and tyhe recording was playedf back sped up 20 octaves so human ears can hear. The result is a remarkably clear and pure gong like sound.
When a magnitude 9 earth quake occurs, the whole earth will reverberates detectably at that frequency for several years.
The entire reverbration from the 2004 Summatra earthquake was recorded by seismometers, and tyhe recording was playedf back sped up 20 octaves so human ears can hear. The result is a remarkably clear and pure gong like sound.