Why are some earthquakes harder to predict than volcanic eruptions?
Quick Answer
Earthquakes often rupture on faults that are hidden deep underground, while volcanoes usually show more visible warning signs like gas, swelling, and small quakes. That makes the exact timing of earthquakes much harder to narrow down.
The Full Story
Both hazards are difficult to forecast, but earthquakes are especially challenging because the fault can remain locked until the moment of rupture with little obvious surface change. Volcanoes often provide more clues, including inflation of the edifice, increased gas emissions, and swarms of small earthquakes. Even so, not every volcanic warning leads to an eruption. Earthquake science is therefore better at estimating long-term hazard and probabilities than at predicting the exact day and time. This is why building codes and preparedness are so important in seismic regions.
Key Facts
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