Unlike weather events, scientists cannot predict the exact timing of earthquakes, but certain natural pre-shocks or environmental anomalies can precede major seismic events. The most definitive natural warning sign is a heavy foreshock or sudden minor shaking immediately preceding a larger mainshock. Other anecdotally reported phenomena include unusual animal behavior, strange ground lights, or subtle electromagnetic fluctuations, though seismologists rely strictly on modern seismograph networks to measure tectonic stress accumulation along active fault lines.
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