The Hayward Fault is given a higher probability than the San Andreas of being the site of the "big one" earthquake. Evidence of the fault can be toured in and around Hayward and northward through Berkeley.


<--Previous  California Geotourism Home  Next-->

Reference: Sloan & Wells 2006, The Hayward Fault (GSA Field Guide)  Download PDF
IMG_7649
View toward SF Bay from Prospect St. in Hayward. the street follows the crest of a 50-ft high ridge that lies just east of the Hayward fault (at the bottom of the slope in Sunset Blvd in this picture), and was pushed up by movement along it.
IMG_7610
Hayward fault runs along the foot of this ridge, which movement along the fault has pushed up.
IMG_7642
San Lorenzo Creek on the east side of the ridge that lies east of the Hayward fault, looking south. The bend in the creek is consistent with its having been deflected by right-lateral movement related to the fault, even though it does not lie within the current fault zone.
IMG_7638
Old Hayward City Hall built in 1930, which sits astride a creeping segment of the fault and had to be abandoned due to gradual accumulation of cracks in the structure.
IMG_7639
IMG_7629
View inside old Hayward City Hall, showing cracks due to continual creeping movement on the Hayward fault, which forced abandonment of the building.
IMG_7635
Building astride Hayward fault, two blocks north of old City Hall, showing bolts placed to prevent damage to brick structure, and cracks caused by the fault.
IMG_7634
Right-lateral offset in edge of parking lot adjacent to cracked building astride Hayward fault, two blocks north of old City Hall.
IMG_7651
Castro Valley's Eden Medical Center. The new facility on the left is under construction to replace the older facility on the right, which cannot be upgraded sufficiently to protect against a major quake on the Hayward fault and will be demolished.
IMG_7615
Closeup of construction of more earthquake-safe hospital in Castro Valley, due to open in 2013.
IMG_7652
View along Warren Freeway, which traces along the Hayward fault. It is not only remarkably straight, but also has mismatch in topographic features due to shifting along the fault - the hill in the distance on the left side of the freeway does not continue on the right.

<--Previous  California Geotourism Home  Next-->

View Larger Map


View Larger Map