Imagine this conversation:
Me: I can predict the outcome of soccer matches! I’ve been watching the clouds and when they take a certain form, I claim I can predict when a goal is going to be scored — and I’ve been right many times before!
You: That sounds impressive…. But wait, can I see one of your predictions?
Me: Sure! I see that the clouds will become thicker later in the week, so I can confidently predict that a goal will be scored somewhere in the Premier League sometime across the weekend.
You: How can I be sure you’re right about this?
Me: Look, the last time I predicted this, I was right! In fact, I’m right almost 50 percent of the time. That’s incredible, right?
You: I suppose, but what about all the times you were wrong?
Me: Does that matter, I get them right, too, so I must be onto something. So, want to pay me money to make these predictions for you?
How many of you would fall for this? Hopefully not many, but if you look at the internet, you’ll find a number of people trying to say they can predict earthquakes and volcanoes across the planet, yet they are doing almost exactly what I said I could do for the Premier League. It is fraudulent, unscientific and wrong.
Updated below with comments from Piers Corbyn
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Listen, I love the interwebs. It provides more information at your fingertips than almost anything in the history of civilization. However, it is also very easy to manipulate people’s opinions because there is just so much information out there. You type in the words “volcanic eruption” into Google, you get over 3.3 million results. How can you sift through that all if you don’t know where to start — especially when it comes to discerning reliable sources from crackpots. If you’re interested in natural disasters, even a simple search shows you a large population on the web of people who claim (or want to believe) that they can predict when an earthquake or eruption will happen. This is different than stating the probability of such an event — this is what volcanic monitoring organization and geologic surveys do for natural hazards. For example, after looking at the signs of activity at a volcano (earthquakes, gas emissions, etc.), they say that an eruption may happen in days to weeks. What I’m talking about are these predictions that say that based on some criteria unrelated to the volcano or fault in question, an earthquake or eruption will occur on a specific date (or narrow window). Typically these predictions are vague, rarely saying too specifically where or exactly when the event will happen. Usually these predictions also have multiple windows of opportunity in a given month for their “massive earthquake or eruption.” They are not talking about probability, but rather specific prediction of geologic events.
And that, folks, is not possible. You cannot predict, weeks in advance, specifically when an earthquake or eruption will occur. Let’s put that to rest.
Let’s take a moment and look at some of these predictions. Here is one from Piers Corbyn, a so-called predictor of weather and geologic events based on the activity of the sun. This is the prediction for April 2012. (By the way, he sells his predictions to those foolish enough to believe him.)
What does it say. Well, between Apr. 8 and 10, there is a “very high” threat of an earthquake or eruption in the Pacific ring, maybe in the northern hemisphere. The earthquake is like to be M6.5 or higher. Here is what actually happened:
But wait, this “window of prediction” was called a confirmation of Corbyn’s method because the M8+ earthquakes off Banda Aceh in Indonesia occurred on … Apr. 11. That is almost the right date, right? It is almost the right hemisphere! Who cares that there were hundreds of earthquakes in the Pacific and Indian rim every day. Who cares that each year, there are over 150 earthquakes over M6.5 or greater, meaning you pick any day of the year, you might have a 1-in-3 chance of picking the right one. Who cares that in your other “windows” nothing happened. This is what we call “cherry picking” the data to fit your prediction, rather than using the data to assess your validity. Make the window big enough and your “prediction” broad enough, you can claim “success” almost every time.
Click source for more!!(I'm not sure if Erik Klemetti agreed with what he set out to do)
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The actual Earthquake and Volcano trial for April was produced in MARCH
Never mind Erik Klemetti, nice try!