Did you know there are different kinds of earthquakes?

Recently, New Zealand and Japan had a series of earthquakes.

Some were thought to be oscillatory, while others were believed to be trepidatory.

It occurred to me that most people might be confused about this, so I thought it wise to let everyone know the difference.

What's the difference between an oscillatory and a

 trepidatory earthquake?

1. This calculation is just for engineers:

2. And this one is for laymen -- like you:

This is a trepidatory earthquake -- an up and down movement....

 

This is an oscillatory earthquake -- a side to side movement...

 

And this is a combination of both trepidatory and oscillatory:

Isn't science beautiful when properly explained???!!!!