Producing 60 earthquakes in a second, each with a magnitude of 4.0, would require an immense amount of energy and is far beyond current technological capabilities. However, let's explore the hypothetical scenario you've presented.
Earthquakes are the result of the release of energy in the Earth's crust, typically caused by tectonic plate movements. The energy released during an earthquake is primarily in the form of seismic waves, which propagate through the Earth.
While earthquakes do generate electromagnetic waves as a secondary effect, these waves are generally very weak and not suitable for practical energy harnessing on a global scale. The electromagnetic waves generated by seismic activity are typically in the radio frequency range and are known as "seismic radio emissions." They are extremely faint and challenging to detect and utilize for practical purposes.
Additionally, even if the electromagnetic waves generated by earthquakes were stronger, it would still be a significant challenge to harness this energy globally. The distribution of earthquakes is unpredictable, as they occur along fault lines and are concentrated in specific regions. To harness this energy, one would need to establish a vast network of sensors and energy conversion systems across the globe, which would be an enormous undertaking.
It's important to note that earthquakes are natural disasters that can cause widespread destruction and loss of life. While it's interesting to explore theoretical possibilities, it's crucial to prioritize safety, risk mitigation, and responsible resource management in any real-world applications.