The Pleasanton Fault is a seismically active geological structure in Alameda County and Contra Costa County, California, US. The existence of the fault is disputed as geotechnical reports have found no evidence for its existence. == 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.
The Pleasanton Fault is a seismically active geological structure in Alameda County and Contra Costa County, California, US. The existence of the fault is disputed as geotechnical reports have found no evidence for its existence. == 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.
Source: Wikipedia "Pleasanton Fault" · CC BY-SA 4.0
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