Tremors associated with volcanoes, often warn of impending eruptions. A study in the journal, Nature, says that the tremors under the San Andreas Fault where rock is lubricated by pressurized water slips easily and weakens the fault. Researchers looked at micro-earthquakes in the area and calculated the stresses produced by the Earth and ocean tides. They found a correlation between the tremors and the stresses produced by the Earth and ocean tides. Studying these tremors can help them predict when the next large earthquake will occur.
Students in class can keep the past and up-to-date data to track tremor information to predict eathquakes. One website they may use is: http://earthquake.usgs.gov/
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