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1857 Earthquake Segment of the San Andreas Fault

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The great earthquake of 9 January 1857 ruptured some 300 kilometers of the San Andreas fault between the Parkfield segment and the southern segment. Although only two deaths were reported in 1857, today many towns lie on or near the fault, as well as two interstate highways and two aqueducts supplying the Los Angeles megalopolis. Another great earthquake is not thought to be imminent here, although the fault is locked and accumulating strain.

In the middle of the central segment is the "big bend" where the fault swings nearly 40 degrees toward the northwest. The resulting tectonic forces have uplifted mountain ranges on both sides and the land on the fault reaches its highest point, approximately 2000 meters.

Follow the San Andreas fault through this region on the interactive fault map at Thule Scientific, publisher of the excellent Field Guide to the San Andreas Fault.

Many photos also have contemporary descriptions of the quake.

San Andreas fault home page

Images 1-12 of 60
Where it happenedIndex MapPlane's-eye viewAerial View, Cajon Pass to Elizabeth LakeStart of the 1857 segmentBlue Cut, Cajon PassDon't it make the brown hills bluePelona Schist
A worthwhile driveEast End of Lone Pine CanyonA dramatic viewLone Pine CanyonAn endangered communityLandslide Scar at WrightwoodFirst of many in the central zoneFault Gouge Near Big Pines
Take the long viewView West from Grandview CanyonA classic siteSan Andreas Fault at Mile HighGoodbye to the Wrightwood sectionView East Near ValyermoLeona Valley
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