It was the San Francisco area including the Bay Bridge. That whole area was build on a marsh which amplifies the tremors.
Where was the 1994 earthquake, magnitude MW of 8.2 , resulting from the Nazca plate's being pushed beneath the mantle of the South American continent?
Which city, rebuilt in the Art Deco style after being largely razed by an earthquake in 1931, has become recognized as architecturally unique, and in 2007 was nominated for UNESCO World Heritage Site status?