This question has already been answered. Here is a link for you: http://www.enotes.com/great-gatsby/q-and-a/what-some-rhetorical-devices-literary-188773
"But his heart was in a constant, turbulent riot." Chapter 6. This metaphor compares Jay Gatsby's personal turmoil with a riot. Both are fierce, uncontrollable and rebellious.
"He stayed there two weeks, dismayed at its ferocious indifference to the drums of his destiny, to destiny itself, and despising the janitor’s work with which he was to pay his way through." Chapter 6. This quote is an example of personification of the indifference the "small Lutheran college of St. Olaf in southern Minnesota" had shown him. Ferocity is a human quality given to indifference to enhance the emotional effect of the description of the school and its atmosphere.
(Page numbers have not been included as they depend on the version of the book you are using. I used the online version.)