> * The camera vibrates long before the pressure wave reaches it. I assume this is due to energy traveling through the ground (i.e. an earthquake). Had to chec

> * The camera vibrates long before the pressure wave reaches it. I assume this is due to energy traveling through the ground (i.e. an earthquake). Had to check it out, earthquake p-waves travel really fast! "Typical values for P-wave velocity in earthquakes are in the range 5 to 8 km/s." https://en.m.wikipedia.org/wiki/P-wave https://en.m.wikipedia.org/wiki/P-wave