Pleasanton Fault

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The Pleasanton Fault is a seismically active geological structure in Alameda County and Contra Costa County, California, USA.[1]

Relation to hydrological features[edit]

All the streams draining Livermore Valley merge above the Bernal Subbasin and then leave the subbasin and the valley as the Arroyo de la Laguna. Groundwater occurs throughout the valley floor portion of the Bernal Subbasin under conditions ranging from unconfined to confined. There is no inflow of groundwater across the Pleasanton Fault south of the City of Pleasanton. This consequence arises because any movement of groundwater in the southern section is essentially parallel to the Pleasanton Fault.[2]

See also[edit]


  1. ^ "Seismic Safety Element of the Alameda County General Plan" (Archived OCR of original). Alameda County. 1982. Retrieved 2018-02-24.
  2. ^ Earth Metrics Incorporated, ‘'Environmental Site Assessment for the Hopyard Village Shopping Center, Pleasanton, California'‘, May 24, 1989

External links[edit]