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thumb|Sketch of trench wall right|thumb|Sandsheet thought to have resulted from the tsunami caused by an earthquake on January 26, 1700, river bank [[Oregon]] thumb|Seismite formed by liquefaction of sediments during a Late Ordovician earthquake (northern Kentucky, USA) Paleoseismology is the study of ancient earthquakes using geologic evidence, such as geologic sediments and rocks. It is used to supplement seismic monitoring to calculate seismic hazard. Paleoseismology is usually restricted to geologic regimes that have undergone continuous sediment creation for the last few thousand years, s