What is the term for the situation in which the researcher's expectations influence the researcher's own behavior, and thereby influence the participant's behavior? placebo effect self-fulfilling prophecy prophecy double-blind prophecy?

this question does't support enough resioning to answer.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.