Final answer:
The plate boundary at location 6 in southern California is a transform boundary known as the San Andreas Fault. The Pacific plate and the North American plate slide past each other horizontally, resulting in earthquakes.
Step-by-step explanation:
The characteristics of the plate boundary at location 6 in southern California can be represented by a transform boundary, specifically the San Andreas Fault. At this boundary, the Pacific plate and the North American plate are sliding past each other horizontally. This sideways sliding movement along the fault line can produce destructive earthquakes.