in Fremont and HaywardBackground
The Hayward fault, a right-lateral strike-slip fault, is part of the San Andreas system (Pacific-
North America plate boundary). It is actively creeping:
slip ratecreep rate-----------------------------9 mm/yr
5-9 mm/yrnorthern Hayward (Oakland)
Bay. Two major earthquakes occurred on the Hayward fault in the 1800s. In 1836, a M=6.75
(approx) EQ on the northern Hayward fault (Oakland & north) caused little damage in the lightly
populated San Francisco Bay area. In 1868, a M=7 EQ (approx) on the southern Hayward fault
(south of Oakland) caused severe damage in Hayward and Fremont.
Stop #1:Arroyo Agua Caliente Park, Fremont
Directions:Take I-680 northbound from San Jose to the FIRST Mission Blvd. exit in south
Fremont (about 12 mi from SJSU). Go right (northeast) about 1/4 mile, take a left on Paseo
Padre Parkway (1st light). Proceed about 1 mile, take a left on Grimmer, then the first right onto
Gardenia; park immediately on the right (in front of Arroyo Agua Caliente Park).
Things to look for:
1) bent curbs2) cracks in the road 3) new pavement or concrete 4) effects on houses?
Stop #2:Downtown Hayward
Directions: Return to Grimmer, go west for 2-3 miles to Auto Mall Parkway/Durham Rd. Take a
left, then an immediate right onto northbound I-880 (Nimitz Freeway). Take the Nimitz north to
Rt. 92, go right on Jackson into downtown Hayward, left on Mission. Park and meet near the
intersection of Mission and B street (also can use metered parking lot on the SW corner).
Instructions: Mark the trace of the Hayward fault where you can find evidence for it in the
shaded area on the accompanying map. In some blocks, there may be evidence for two distinct
branches. Things to look for:
1) bent curbs2) cracks in the road3) new pavement or concrete
4) effects on the old city hall (now closed)
5) building walls that are not straight6) new brickwork etc in building walls
