Earthquakes

Earthquakes: explained so you can remember!

It might be well to be a bit knowledgeable about earthquakes in case someone asks or wants to know more about them.  

Since science was my chosen profession for 35 years, I might be a bit more able than most to explain it.

In hopes of a "knowing" society, I present this.

 What's the difference between

an oscillatory and a trepidatory earthquake? 

 1. This calculation is just for engineers:

This is a trepidatory earthquake:

This is an oscillatory earthquake:

And this is a combination of both: (trepidatory and oscillatory)

    
Science is beautiful when it is well explained...