Debris flows triggered by the El Nino rainstorm of February 2-3, 1998, Walpert Ridge and vicinity, Alameda County, California

Coe, J. A.; Godt, J. W.

Abstract:

On February 2 and 3, 1998, a rainstorm generated by the 1997-98 El Nino moved through the San Francisco Bay region of California triggering widespread slope failures. In the Walpert Ridge area of Alameda County 531 debris flows were triggered by the storm. These data depict the debris flows and landslides as polygons. The landslide polygons were mapped from 1:30,000 aerial photography using a PG2 photogrammetric plotter. The mapped debris flows and landslides were digitized manually in ArcInfo.

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USGS Numbered Series

ProdID:

61463

Citation Author:

Coe, J. A.; Godt, J. W.

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ENGLISH

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Citation LatN:

0374000

Citation LatS:

0373230

Citation LonE:

-1215230

Citation LonW:

-1220430

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Three sheets. All sheets 58 by 36 inches (in color)

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Miscellaneous Field Studies Map

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Citation Series Number:

2384

Citation Search Results Text:

Debris flows triggered by the El Nino rainstorm of February 2-3, 1998, Walpert Ridge and vicinity, Alameda County, California; 2001; MF; 2384; Coe, J. A.; Godt, J. W.

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2001

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citation/reference

Text:

Debris flows triggered by the El Nino rainstorm of February 2-3, 1998, Walpert Ridge and vicinity, Alameda County, California; 2001; MF; 2384; Coe, J. A.; Godt, J. W.