= Introduction to paleoseismology by United States Geological Survey
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{tag=Work by United States Geological Survey}
https://www.usgs.gov/programs/earthquake-hazards/introduction-paleoseismology
The institutional Earthquake Hazards Program page explains how disrupted young layers and unbroken overlying cover identify event horizons, and how ages above and below the affected horizon bracket a past <earthquake>. It distinguishes primary fault displacement from secondary shaking evidence.
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