downthrow vs scalping

downthrow

noun
  • A depression of the strata on one side of a fault 

  • Ruin; defeat. 

scalping

noun
  • A legitimate method of arbitrage of small price gaps created by the bid-ask spread. 

  • The action by which someone is scalped. 

  • A fraudulent form of market manipulation in which a person buys shares immediately before recommending the shares to others, thus driving the price up. 

How often have the words downthrow and scalping occurred in a corpus of books? (source: Google Ngram Viewer )