<P> The Hayward Fault Zone is a geologic fault zone capable of generating destructive earthquakes . This fault is about 74 mi (119 km) long, situated mainly along the western base of the hills on the east side of San Francisco Bay . It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Hayward, Union City, Fremont, and San Jose . </P> <P> The Hayward Fault is parallel to the San Andreas Fault, which lies offshore and through the San Francisco Peninsula . To the south of the Hayward lies the Calaveras Fault . In 2007 the Hayward Fault was discovered to merge with the Calaveras Fault east of San Jose at a depth of 4 miles (6.4 km), with the potential of creating earthquakes much larger than previously expected . Some geologists have suggested that the Southern Calaveras should be renamed as the Southern Hayward . </P>

What type of fault is the hayward fault