There is no way of knowing, that's what makes earthquakes so very terrifying.
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Earthquakes cannot be predicted with certainty, so it is difficult to know when one is coming your way. However, monitoring local seismic activity and having an emergency plan in place can help you be prepared in case an earthquake does occur. It's important to be aware of your surroundings and be ready to take cover if you feel shaking.
The scientists did not know that the San Francisco earthquake was coming because one seismologist was an idiot and thought it was a volcano When he was wrong the other seismologists called him bad words and then kicked him out.
Scientists did not know the 1989 San Francisco earthquake was coming because earthquakes cannot currently be predicted with precision. While scientists can monitor fault lines and seismic activity, the timing and magnitude of an earthquake remain unpredictable. Early warning systems have been developed to provide a few seconds to tens of seconds of advance warning, but predicting exactly when and where an earthquake will strike continues to be a challenge.
When an underwater earthquake displacing a large volume of sea water the effect could be a tsunami (tidal wave).
Earthquake precursor phenomena are physical or environmental signs that may indicate an impending earthquake. These can include changes in groundwater levels, unusual animal behavior, electromagnetic anomalies, and seismic swarms. While these phenomena can provide valuable information, they are not always reliable predictors of earthquakes.
Tsunami