Historic accounts highlight three significant earthquakes in 1838, 18 in the San Francisco and Monterey Bay regions.Previous paleoseismic studies on the Santa Cruz section of the San Andreas Fault could not distinguish all of these events in the Earth’s surficial layers.So you can identify when and where an earthquake happened by studying lichen.
The new results suggest that the San Andreas Fault System shifted character from a sequence of several large earthquakes in the 1800s to one very large, multi-segment earthquake in the 1900s.
Recognizing this change in character may help to better understand earthquake mechanics on the San Andreas Fault System.
A form of radiometric dating used to determine the age of organic remains in ancient objects, such as archaeological specimens, on the basis of the half-life of carbon-14 and a comparison between the ratio of carbon-12 to carbon-14 in a sample of the remains to the known ratio in living organisms. A technique for measuring the age of organic remains based on the rate of decay of carbon 14.
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