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Lecture

GEOL 106 Lecture Notes - Radiometric Dating, Half-Life, Return Period


Department
Geological Sciences and Geological Engineering
Course Code
GEOL 106
Professor
Prof.

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Hazard City
Map reading exercise
o Introduction
o Basic map reading
o Reading topographic maps
o Plateu map
o (nothing needs to be handed in)
Hazard city
Be on earthquakes
Carbon-14 Dating
So once the tree dies the amount of c14 in the tree decreases
at a fixed rate
o We measure the 14c/12c ration
Half-life – length of time for ½ of the radioactive element to
decay
Carbon 14 starts to decade into 14n
o Half lives … when at 0 no 14 .. 1 half and half … 2 more
14n .. 3 more 14 n less c14
o 1 half life for c14 = 5730 years
o Note yr BP – means years before present
o 14c dating ( and other radiometric “dating” methods)
o can be used to determine when a fault last moved (if
your seismometers haven’t already told you the
answer)
o is it active?
o But .. it is a “subjective: determination to decide if a
particular movement event was a “big” earthquake or
just a small one
o We can turn to other evidence of “big” quake activity
that is less subjective
NOW – after all of what we talked about, you can then create a full
picture of the seismic risk for your area of interest
Write reports
Try to quantify it
Make risk maps
Genral approach to risk analysis and risk management
Risk Analysis
o 1. Understand the hazard(general)
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