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- In addition to earthquakes that occur on mapped faults, hazards are also presented by earthquakes not associated with known geological structures. The occurrence of these events is best viewed as a random process, hence the term "random" earthquake. Based on earthquake recurrence relationships for an area, estimates of source-to-site distances can be calculated for various magnitudes and probabilities of occurrence.
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- Active fault, Capable fault, Design response spectra, Maximum credible earthquake (MCE), Maximum design earthquake (MDE), Safety Evaluation Earthquake (SEE), Seismic evaluation criteria, Seismotectonic, Seismotectonic Province, Synthetic earthquake