Where's the Hayward Fault?

Map with a cross section showing a regional geologic interpretation on a direction perpendicular (northwest to southeast) with a projection of the land surface modified from a Google Earth projection of the Hayward Fault (viewed toward the northwest).

Mission Peak area (cross section south of Fremont)
Click here to display a legend of geologic units.

Mission Peak area (cross section south of Fremont) The cross section cuts through Mission Peak near Fremont (on the right) and crosses the south end of San Francisco Bay near San Jose and Mountain View (on the left). It shows that at the south end of the Hayward Fault, the dip angle flattens out near the surface (along the mountain front). To the south, the fault becomes a series of interconnecting low angle faults that merge eventually with the Central Calaveras Fault (in the foothills of the Diablo Range east of San Jose in the vicinity between Alum Rock Park and Mount Hamilton). For comparison with the geologic map diagram, this map is the same geologic cross section pendicular to the Hayward Fault with a projection of the land surface modified from a Google Earth projection of the Hayward Fault (viewed toward the northwest).

For more information about geologic names and words in the legend, see glossary definitions (including Coast Range Ophiolite, Franciscan Formation, Great Valley Sequence,geologic time scale,gabbro, serpentinite, alluvium, and more).