Do you think if there should be an earthquake is right? To me it sounds like a non native speaking English as a second language Israelis and Germans often use this sort of construction.
I wouldn't take google as an authority. I am talking as someone who is native British English speaker. This doesn't mean I am right but does indicate at least an informed hunch based on 40 years of speaking and being surrounded by the language.
I wouldn't say what if there should be a telephone call or a power cut, so why would I say what if there should be an earthquake?