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The Hayward Fault is California's most dangerous, and also its creepiest. But that's because it creeps along at a constant rate of 5 mm/yr in between major earthquakes!
The Hayward Fault is the second largest fault in the San Francisco Bay Area, and it stretches over 110 kilometers through the densely populated East Bay region. Because of the dense population and amount of critical infrastructure surrounding it, the Hayward Fault is probably the most dangerous in the country as well. The hazard is not what brought me to Fremont's Central Park though. This park displays some of the best examples of active fault aseismic creep - fault motion without earthquakes - anywhere on the continent. The fault has cut through and offset streets, sidewalks, and buildings all along its length and these are famously and best shown on the patio of the Fremont Community Center.
NOTE: The community center building was closed when we went, but if you are able to visit the inside there is a great exhibit about aseismic creep and earthquake science which features the huge cracks in the building's foundation!
