Pleasanton Fault Explained

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

• Mocho Subbasin
• Tesla Fault

External links

• Bulletin of the Seismological Society of America; December 1971; v. 61; no. 6; p. 1795-1799; 1971 Seismological Society of America, NATIONAL CENTER FOR EARTHQUAKE RESEARCH U. S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA

Notes and References

1. Web site: Seismic Safety Element of the Alameda County General Plan . https://archive.today/20121211223437/http://library.ceres.ca.gov/docs/data/0900/934/HYPEROCR/hyperocr.html . dead . 2012-12-11 . 2018-02-24 . 1982 . Alameda County . Archived OCR of original.
2. Web site: Fault Ground-Rupture Investigation Proposed Dublin Crossing Mixed Use Development, Camp Parks Reserve Forces Training Area, Dublin CA . 2021-07-25 . Berlogar, Stevens, and Associates. . 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 . March 27, 2013 . City of Dublin, California.
3. Earth Metrics Incorporated, ‘'Environmental Site Assessment for the Hopyard Village Shopping Center, Pleasanton, California'‘, May 24, 1989