Which is silly since pre-existing fiber optic networks are taking ambient seismic surveys all day and night by virtue of just existing and being monitored and utilized for long distance highspeed data transmission.

https://www.earthscope.org/what-is/das/

In general (which means lots of handwaving here) most of the kinetic energy in earth's crust is happening at plate boundaries, subduction zones or continent-continent collisions (Himalayas).

https://en.wikipedia.org/wiki/Ring_of_Fire