The Pleasanton Fault is a seismically active geological structure in Alameda County and Contra Costa County, California, USA.[1] The existence of the fault is disputed as geotechnical reports have found no evidence for its existence.[2]

Relation to hydrological features

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.[3]

See also

References

  1. ^ "Seismic Safety Element of the Alameda County General Plan" (Archived OCR of original). Alameda County. 1982. Archived from the original on 2012-12-11. Retrieved 2018-02-24.
  2. ^ Berlogar, Stevens, and Associates. (March 27, 2013). "Fault Ground-Rupture Investigation Proposed Dublin Crossing Mixed Use Development, Camp Parks Reserve Forces Training Area, Dublin CA". City of Dublin, California. Retrieved 2021-07-25. Based on the findings from the above fault investigations, there is no substantiated evidence for the existence of the inferred Pleasanton Fault traces shown on the current A-P Earthquake Fault Zone Map((cite web)): CS1 maint: multiple names: authors list (link)
  3. ^ Earth Metrics Incorporated, ‘'Environmental Site Assessment for the Hopyard Village Shopping Center, Pleasanton, California'‘, May 24, 1989

External links

Seismically active fault zones and tectonic blocks of California
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