GEOL 106 Lecture 2: geology- oct 16
Document Summary
What sort of energy is released by quakes. Gives an idea of which faults are most active. Gives some idea of frequency and magnitude of quakes. Determine the age of the fault movements relative age absolute age relative time - law of superposition. For sediment layers, oldest are on the bottom, youngest on the top cross cutting relationship - faults cut across the layers - fault is younger than layers. Determine the relative age of the fault the absolute age : radiometric-dating methods (carbon-14 dating) The time since organic matter dried can be determined by the carbon 14 method. Look for evidence of ancient events of : tsunamis and ground elevation and ground subsidence. Theses events can instantly bury swamps with sand. You can date the dead organic matter / c14 method. This gives the age of the earthquake. 9 major events in 1400 years recurrence interval of 160 years: determine the geologic/ geographic relations in the area.