Hayward Fault Zone

Hayward FaultHaywardRodgers Creek Faulta major faultHayward faultsHayward-Rodgers Creek Fault SystemHayward–Rogers Creek Fault ZoneRogers Creek Fault
The Hayward Fault Zone is a geologic fault zone capable of generating destructive earthquakes.wikipedia
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Hayward, California

HaywardHayward, CACalifornia (Hayward)
It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. Some of the cities in the eastern bay shore and south bay region near this fault include Richmond, El Cerrito, Berkeley, Albany, Emeryville, Kensington, Oakland, Piedmont, San Leandro, San Lorenzo, Castro Valley, Hayward, Union City, Fremont, Newark, Milpitas, Niles, and portions of San Jose.
The site of his home was on the former El Camino Viejo, or Castro Street (now Mission Boulevard) between C and D Streets, but the structure was severely damaged in the 1868 Hayward earthquake, with the Hayward Fault running directly under its location.

El Cerrito, California

El CerritoEl Cerrito, CAEl Cerrito, Contra Costa County, California
It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. Some of the cities in the eastern bay shore and south bay region near this fault include Richmond, El Cerrito, Berkeley, Albany, Emeryville, Kensington, Oakland, Piedmont, San Leandro, San Lorenzo, Castro Valley, Hayward, Union City, Fremont, Newark, Milpitas, Niles, and portions of San Jose.
(El Cerrito—Spanish, "the little hill"—takes its name from Albany Hill.) The Hayward Fault runs through El Cerrito.

San Leandro, California

San LeandroSan Leandro, CACity of San Leandro
It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. Some of the cities in the eastern bay shore and south bay region near this fault include Richmond, El Cerrito, Berkeley, Albany, Emeryville, Kensington, Oakland, Piedmont, San Leandro, San Lorenzo, Castro Valley, Hayward, Union City, Fremont, Newark, Milpitas, Niles, and portions of San Jose.
In 1856 San Leandro became the county seat of Alameda county, but the county courthouse was destroyed there by the devastating 1868 quake on the Hayward Fault.

San Francisco Bay

BaySan FranciscoSan Francisco Harbor
This fault is about 74 mi long, situated mainly along the western base of the hills on the east side of San Francisco Bay.
San Francisco Bay is thought to represent a down-warping of the Earth's crust between the San Andreas Fault to the west and the Hayward Fault to the east, though the precise nature of this remains under study.

Berkeley, California

BerkeleyBerkeley, CACity of Berkeley
It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. Some of the cities in the eastern bay shore and south bay region near this fault include Richmond, El Cerrito, Berkeley, Albany, Emeryville, Kensington, Oakland, Piedmont, San Leandro, San Lorenzo, Castro Valley, Hayward, Union City, Fremont, Newark, Milpitas, Niles, and portions of San Jose.
East of the Hayward Fault along the base of the hills, elevation increases more rapidly.

San Jose, California

San JoseSan Jose, CASan José
It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. Some of the cities in the eastern bay shore and south bay region near this fault include Richmond, El Cerrito, Berkeley, Albany, Emeryville, Kensington, Oakland, Piedmont, San Leandro, San Lorenzo, Castro Valley, Hayward, Union City, Fremont, Newark, Milpitas, Niles, and portions of San Jose.
The other faults near San Jose are the Monte Vista Fault and the Hayward Fault Zone.

Calaveras Fault

Calaveras
To the east of the Hayward lies the Calaveras Fault.
Between the San Andreas Fault and the Calaveras Fault lies the Hayward Fault, which diverges from the Calaveras Fault east of San Jose, California.

1868 Hayward earthquake

1868Hayward earthquake1868 Hayward
With an estimated moment magnitude of 6.3–6.7 and a maximum Mercalli intensity of IX (Violent), it was the most recent large earthquake to occur on the Hayward Fault Zone.

Maacama Fault

Another fault further north, the Maacama Fault, is also considered to be part of the "Hayward Fault subsystem".
It is considered to be the northernmost segment of the Hayward Fault subsystem of the San Andreas Fault zone.

Berkeley Hills

East Bay HillshillsVollmer Peak
There are many small active landslides and evidence of numerous large archaic landslides in the Berkeley Hills.
The Berkeley Hills are bounded by the major Hayward Fault along their western base, and the minor Wildcat fault on their eastern side.

Montclair, Oakland, California

MontclairMontclair DistrictMontclair Village
In this rift valley there are a number of elevated street crossings in the Montclair District that cross the fault.
Montclair is located along the western slope of the Oakland Hills from a valley formed by the Hayward Fault to the upper ridge of the hills.

Point Pinole Regional Shoreline

Point PinolePt. Pinole
The connection between the Rodgers Creek Fault Zone and the Hayward Fault Zone was unclear until 2015 when a survey of the floor of San Pablo Bay found that the ends of the two faults were smoothly linked between Point Pinole and Lower Tubbs Island.
Geologically, it is a result of movement on the Hayward Fault which runs along its western edge, creating a low scarp.

Caldecott Tunnel

Broadway TunnelBroadway Low Level Tunnel
State Highway 24, connecting Oakland to Orinda, Lafayette, and Walnut Creek through the Caldecott Tunnel, is composed of extensive earth fill at the location where the fault is crossed.
The active Hayward Fault runs just west of the western portals of the tunnel.

San Andreas Fault

San AndreasSan Andreas Fault ZoneSan Andreas Rift
The Hayward Fault is parallel to the San Andreas Fault, which lies offshore and through the San Francisco Peninsula.

Seismic retrofit

seismic retrofittingearthquake-proofseismic upgrade
Although many structures have undergone seismic retrofitting there are a large number of dangerous unreinforced masonry (mostly brick) structures and chimneys, which can be extremely hazardous to occupants in a large earthquake, and a large number of buildings which are either not bolted to their foundations or with soft stories that are insufficiently resistant to shear forces.
In this case, there was sufficient vertical strength in the building columns and sufficient shear strength in the lower stories that only limited shear reinforcement was required to make it earthquake resistant for this location near the Hayward fault.

Interstate 580 (California)

Interstate 580I-580580
In its northern extent, the Hayward Fault lies directly beneath the portion of Highway 13 (the Warren Freeway) that is south of its intersection with Highway 24 and north of its terminal connection with Interstate 580 (the MacArthur Freeway).
Between this interchange and Castro Valley, I-580 runs near or along the trace of the Hayward Fault, a major branch of the San Andreas Fault.

Contra Costa County, California

Contra Costa CountyContra CostaContra Costa Counties
Along the north shore of Contra Costa County, substantial amounts of pressurized liquid gas, flammable liquids, caustic materials, and various toxics are stored temporarily in bulk railcars adjacent to passenger and freight traffic mainlines, with great potential hazards should a derailment occur.
The Hayward Fault Zone runs through the western portion of the county, from Kensington to Richmond.

Association of Bay Area Governments

ABAG
The Association of Bay Area Governments (ABAG) in concert with other government agencies has sponsored the analysis of local conditions and the preparation of maps indicative of the destructive potential of these earthquakes.

California State Route 13

State Route 13Highway 13Ashby Avenue
In its northern extent, the Hayward Fault lies directly beneath the portion of Highway 13 (the Warren Freeway) that is south of its intersection with Highway 24 and north of its terminal connection with Interstate 580 (the MacArthur Freeway).
This valley is enclosed by the far eastern hills of Oakland and a shutter ridge that has been driven northwestward along the Hayward Fault, and the entire freeway lies within the earthquake fault zone of the Hayward Fault.

San Francisco Bay Area

Bay AreaSan FranciscoBay Area, California
Water could be cut off to 2.4 million people living in California's San Francisco Bay Area.
The Santa Cruz Mountains along the San Francisco Peninsula and the Marin Hills in Marin County follow the San Andreas fault, The Berkeley Hills, San Leandro Hills and their southern ridgeline extension through Mission Peak roughly follow the Hayward fault, and the Diablo Range, which includes Mount Diablo and Mount Hamilton and runs along the Calaveras fault.

MacArthur Maze

Bay Bridge Distribution StructureMacArthur Maze Repairmajor freeway interchange
Better, but still locally poor soils underlie the portion of Interstate Highway 880 that extends to the South Bay region from the MacArthur Maze.

Piedmont, California

PiedmontPiedmont, CA(CA)
Some of the cities in the eastern bay shore and south bay region near this fault include Richmond, El Cerrito, Berkeley, Albany, Emeryville, Kensington, Oakland, Piedmont, San Leandro, San Lorenzo, Castro Valley, Hayward, Union City, Fremont, Newark, Milpitas, Niles, and portions of San Jose.
It is located near the Hayward Fault, a geological fault line that runs through the East Bay region.

Fremont, California

FremontFremont, CANiles, California
It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. Some of the cities in the eastern bay shore and south bay region near this fault include Richmond, El Cerrito, Berkeley, Albany, Emeryville, Kensington, Oakland, Piedmont, San Leandro, San Lorenzo, Castro Valley, Hayward, Union City, Fremont, Newark, Milpitas, Niles, and portions of San Jose.
In 1868 the 6.8-magnitude Hayward earthquake on the Hayward Fault collapsed buildings throughout the Fremont area, ruining Mission San José and its outbuildings.

California Memorial Stadium

Memorial StadiumWest Fieldat Berkeley
Further north the fault passes under the lengthwise midline of the football field of California Memorial Stadium at the University of California, Berkeley.
Because the stadium would be directly atop the Hayward Fault, it was constructed out of two halves, the eastern side was built into the hills, while the west side contained the main structure built in the neo-classical architecture style to resemble the Roman Coliseum.

University of California, Berkeley

UC BerkeleyUniversity of California at BerkeleyBerkeley
Further north the fault passes under the lengthwise midline of the football field of California Memorial Stadium at the University of California, Berkeley.
The campus sits on the Hayward Fault, which runs directly through California Memorial Stadium.