Nation Magnitude 4.5 earthquake shakes San Francisco Bay area days before Loma Prieta anniversary October 15, 2019Joshua Bote, USA TODAYComments Off on Magnitude 4.5 earthquake shakes San Francisco Bay area days before Loma Prieta anniversary A magnitude 4.5 earthquake shook the San Francisco Bay Area at 10:33 p.m. Monday, with the epicenter in the Pleasant Hill and Walnut Creek areas