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In October 2004, 38 feet of core samples were extracted from the San Andreas Fault Observatory at Depth (or SAFOD) Main Hole at a measured depth of 10,000 feet. The samples are stored at the Integrated Ocean Drilling Program's Gulf Coast Repository at Texas A&M University. In a modern-day journey to the centre of the Earth, geologists are exploring the structure and evolution of the North American continent at scales from hundreds of kilometers to less than a millimeter, and from the structure of a continent, to individual faults, earthquakes and volcanoes. The project is called EarthScope. With approximately $200 million in funding from the National Science Foundation (NSF), EarthScope began development in 2004, and will continue over a five year period. It is expected to operate for an additional 15 years.
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