According to USGS seismologists it is " the most urban fault ” in the East Bay , with potential for a larger event than the 2014 South Napa earthquake . As critical infrastructure , including refineries that process a significant portion of the state 's total crude oil , and a railroad bridge , lie under it , a major earthquake from it could leave the entire northern half of the state without fuel and disrupt transmission of electricity and water to some extent across the state . One particular pumping station , if hit by a quake , would particularly damage transmission of fuel . A major earthquake there could also cause flooding , which would impact drinking quality , and a loss of electricity
2014 South Napa earthquake
2014 South Napa earthquake
Concord Fault