From the recording The Earth's Tone
The tonal vibration of the Earth is C#.
This recording is tuned to 528 Hz (A=444 Hz), the healing Solfeggio frequency known as the love frequency that is also used nowadays by geneticists to heal DNA.
In addition, this recording includes a perfect fifth and a warm resonant vocal. The sounds were recorded in a pulsating mode to reflect the Earth's heartbeat.
Headphones or good speakers are recommended to better perceive and enjoy the vibrations.