Two heavy early afternoon tremors strike San Francisco, California but start no fires and cause no fatalities

The heaviest shocks in a year-long series of smaller seismic events in northern California struck the city of San Francisco just before one in the afternoon.  The tremor lasted five seconds then a heavier ten second shock was felt almost immediately.  Walls collapsed around the town, particularly on Mission and Market Streets but there were no fires and no reported fatalities.  Buildings suffered also in San Jose, Santa Clara, and Stockton.  (By John Osborne)