Activities from the 2005 GSA Poster Session on Rates and Time
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of 11 matches Determining Earthquake Recurrence Intervals from
Trench Logs part of Rates and Time:GSA Activity Posters Trench
logs of the San Andreas Fault at Pallett Creek, CA are the data
base for a lab or homework assignment that teaches about
relative dating, radiometric dating, fault recurrence intervals
and the reasons for uncertainty in predicting geologic
phenomena. Students are given a trench log that includes several
fault strands and dated stratigraphic horizons. They estimate
the times of faulting based on bracketing ages of faulted and
unfaulted strata. They compile a table with the faulting events
from the trench log and additional events recognized in nearby
trenches, then calculate maximum, minimum and average earthquake
recurrence intervals for the San Andreas Fault in this area.
They conclude by making their own prediction for the timing of
the next earthquake. Learn m