Precursor 8
Precursor 8 : The observation of a number of anomalous physical phenomena prior to the occurrence of earthquakes (termed precursors) has prompted research into identifying and verifying them as possible indicators for routine use in earthquake prediction. They types of precursors that have been identified fall into the categories of crustal deformation, seismic activity, geochemical and hydrological anomalies, and other types of geophysical anomalies
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