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Posted by / 17-Feb-2020 11:46

Carbon dating earthquakes

(Kate Scharer, USGS) Once you’ve found a fault, you need to be able to see the layers of sediment and soils that have been deposited over time beneath the surface.Usually this requires digging trenches across the fault.Consequently, paleoseismology mostly provides data on the biggest earthquakes with the potential to cause the most damage.These three photos show on the left a photo from the air, in the middle a first return lidar, and on the right a bare earth lidar for a location along the San Andreas Fault where it crosses Annapolis Rd south of Gualala.

Arctic sea-ice has decreased rapidly during the last decades in concert with substantial global surface warming.The fault is difficult to see in the air photo and first return lidar, but is obvious in the bare earth lidar.To find direct evidence for a paleoearthquake, first you need to find a fault.­ ­You probably have seen or read news stories about fascinating ancient artifacts.At an ar­chaeological dig, a piece of wooden tool is unearthed and the archaeologist finds it to be 5,000 years old.

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What methods do they use and how do these methods work?

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