San Andreas Fault Observatory at Depth (SAFOD)
SAFOD is a 2.6 m (1.6 miles) deep borehole, drilled deep beneath the surface, crossing right through the San Andreas Fault in California. The borehole goes through an area where many small earthquakes often occur. SAFOD will help us understand where and how earthquakes begin by sampling the actual rocks of a tectonic fault.
What do the rock core samples from SAFOD look like?
Question 1:
Where along the San Andreas Fault is SAFOD located?
Question 2:
What kind of rocks and minerals make up the San Andreas fault?