Visual Glossary - paleoseismicity
paleoseismicity
Paleoseismicity refers to earthquakes recorded geologically, most of them unknown from human descriptions or seismograms. Geologic records of past earthquakes can include faulted layers of sediment and rock, injections of liquefied sand, landslides, abruptly raised or lowered shorelines, and tsunami deposits.
USGS and university geologists study the walls of a trench across a recently discovered strand of the Seattle fault.