Fault Valley at Lake Temescal
The Hayward Fault in Oakland, California
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The fault runs through central and north Oakland in a distinct linear valley. At its north end is Lake Temescal, once a reservoir and now a regional recreation area. This view shows the steep rocky western wall of the valley and its flat floor. The fault has two strands here, one on each side of the flats.
The rocks of the western wall have moved some 80 kilometers to the right over the approximately 15 million years since the Hayward fault was born. They belong to the Franciscan complex, while on this side the rocks are of the Great Valley complex, some 100 million years younger.
Photo (c) 2005 Fleur Helsingor, reproduced by permission. (fair use policy)
